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If one user is authenticated, such as the primary secured client services client host, the same level of network access is provided to any host connected to the same port. If a secondary host is a MACsec supplicant, it cannot be authenticated and traffic would not flow. A secondary host that is a non-MACsec host can send traffic to the network without authentication because it is in multiple-host mode. We do not recommend using multiple-host mode because after the first successful client, authentication is not required for other clients, which is not secure.

Some MKA counters are aggregated globally, while others are updated both globally and per session. You can also obtain information about the status of MKA sessions. This is an example of the show mka statistics command output:. For description of the output fields, see the command reference for this release.

MACsec is disabled. No MKA policies are configured. Note that MKA also requires that you enable The maximum policy name length is 16 characters. Enables replay protection, and configure the window size in number of frames. The range is from 0 to The default window size is 0.

Entering a window size of 0 is not the same as entering the no replay-protection command. Configuring a window size of 0 uses replay protection with a strict ordering of frames. Entering no replay-protection turns off MACsec replay-protection. Optional Saves your entries in the configuration file. This example configures the MKA policy relay-policy:.

Identifies the MACsec interface, and enter interface configuration mode. The interface must be a physical interface. Optional Specifies that the switch processes authentication link-security failures resulting from unrecognized user credentials by authorizing a restricted VLAN on the port after a failed authentication attempt.

Configures authentication manager mode on the port to allow both a host and a voice device to be authenticated on the If not configured, the default host mode is single. If not set, the default is should secure. Enables The port changes to the authorized or unauthorized state based on the authentication exchange between the switch and the client.

Configures the port to drop unexpected incoming MAC addresses when a new device connects to a port or when a device connects to a port after the maximum number of devices are connected to that port. If not configured, the default is to shut down the port. If no MKA policy was configured by entering the mka policy global configuration command , you must apply the MKA default policy to the interface by entering the mka default-policy interface configuration command.

Configure the port as an When the PortFast feature is enabled, the interface changes directly from a blocking state to a forwarding state without making the intermediate spanning-tree state changes. This is an example of configuring and verifying MACsec on an interface:. Table summarizes the Cisco TrustSec features supported on the switch. Table Cisco TrustSec Features.

Protocol for Between MACsec-capable devices, packets are encrypted on egress from the sending device, decrypted on ingress to the receiving device, and without encryption within the devices. This feature is only available between NDAC is an authentication process by which each network device in the TrustSec domain can verify the credentials and trustworthiness of its peer device.

SAP is a Cisco proprietary key exchange protocol between switches. The protocol description is available under a nondisclosure agreement. Note SGT is not supported in this release. An SGT is a bit single label showing the security classification of a source in the TrustSec domain. It is appended to an Ethernet frame or an IP packet. When both ends of a link support An EAPOL-key exchange occurs between the supplicant and the authenticator to negotiate a cipher suite, exchange security parameters, and manage keys.

Successful completion of these tasks results in the establishment of a security association SA. Depending on your software version and licensing and link hardware support, SAP negotiation can use one of these modes of operation:. It is not supported on:. The switch also does not support security group ACLs. You can configure Cisco TrustSec link-layer security in Optional Displays Cisco TrustSec credentials configured on the switch.

This example shows how to create Cisco TrustSec credentials:. For You enable Cisco TrustSec link-layer switch-to-switch security on an interface that connects to another Cisco TrustSec device. When configuring Cisco TrustSec in If you select GCM without the required license, the interface is forced to a link-down state. Enters interface configuration mode for the uplink interface.

Note The interface must be an uplink interface on the network services module. Configures the uplink interface to perform NDAC authentication. Optional Configures the SAP operation mode on the interface. The interface negotiates with the peer for a mutually acceptable mode. Enter the acceptable modes in your order of preference.

Note If the interface is not capable of data link encryption, no-encap is the default and the only available SAP operating mode. SGT is not supported. Note Although visible in the CLI help, the timer reauthentication and propagate sgt keywords are not supported.

Exits Cisco TrustSec Optional Verifies the configuration by displaying TrustSec-related interface characteristics. This example shows how to enable Cisco TrustSec authentication in This example shows output from the show cts interface summary command:. This example shows output from the show cts interface command for a specified interface:. If your switch does not have access to an authentication server or if You must manually configure the interface on each end of the connection.

When manually configuring Cisco TrustSec on an interface, consider these usage guidelines and restrictions:. The protection is selected by the supplicant according to supplicant preference. The SAP operation mode options:. Use the no form of this command when the peer is incapable of processing a SGT.

The no propagate sgt command prevents the interface from transmitting the SGT to the peer and is required in manual mode. However, the interrelationship between this number and the number of other features being configured might impact CPU performance because of hardware limitations.

See the "Configuring Layer 3 Interfaces" section for information about what happens when hardware resource limitations are reached. For full Layer 3 routing or for fallback bridging, you must have the IP services image installed. Additional SVIs must be explicitly configured. Although the switch supports a total or VLANs and SVIs , the interrelationship between the number of SVIs and routed ports and the number of other features being configured might impact CPU performance because of hardware limitations.

Note When you create an SVI, it does not become active until it is associated with a physical port. SVIs support routing protocols and bridging configurations. Note The IP base image supports static routing and RIP; for more advanced routing or for fallback bridging, you must have the IP services image installed.

You can use the SVI autostate exclude feature to configure a port so that it is not included in the SVI line-state up-an- down calculation. For example, if the only active port on the VLAN is a monitoring port, you might configure autostate exclude on that port so that the VLAN goes down when all other ports go down.

When enabled on a port, autostate exclude applies to all VLANs that are enabled on that port. This prevents features such as routing protocols from using the VLAN interface as if it were fully operational and minimizes other problems, such as routing black holes.

EtherChannel port groups treat multiple switch ports as one switch port. These port groups act as a single logical port for high-bandwidth connections between switches or between switches and servers. An EtherChannel balances the traffic load across the links in the channel. If a link within the EtherChannel fails, traffic previously carried over the failed link changes to the remaining links.

You can group multiple trunk ports into one logical trunk port, group multiple access ports into one logical access port, group multiple tunnel ports into one logical tunnel port, or group multiple routed ports into one logical routed port. Most protocols operate over either single ports or aggregated switch ports and do not recognize the physical ports within the port group. When you configure an EtherChannel, you create a port-channel logical interface and assign an interface to the EtherChannel.

Use the channel-group interface configuration command to dynamically create the port-channel logical interface. This command binds the physical and logical ports together. For Layer 3 interfaces, you manually create the logical interface by using the interface port-channel global configuration command. Then you manually assign an interface to the EtherChannel by using the channel-group interface configuration command.

Some switches support dual-purpose uplink ports. Each uplink port is considered as a single interface with dual front ends—an RJ connector and a small form-factor pluggable SFP module connector. The dual front ends are not redundant interfaces, and the switch activates only one connector of the pair. By default, the switch dynamically selects the interface type that first links up. However, you can use the media-type interface configuration command to manually select the RJ connector or the SFP module connector.

For information about configuring speed and duplex settings for a dual-purpose uplink, see the "Setting the Interface Speed and Duplex Parameters" section. The port LED is on for whichever connector is active. For more information about the LEDs, see the hardware installation guide. PoE-capable switch ports automatically supply power to these connected devices if the switch senses that there is no power on the circuit :. A powered device can receive redundant power when it is connected only to a PoE switch port and to an AC power source.

The switch does not reply to the power-consumption messages. The switch can only supply power to or remove power from the PoE port. The negotiation allows a high-power Cisco powered device, which consumes more than 7 W, to operate at its highest power mode. The powered device first boots up in low-power mode, consumes less than 7 W, and negotiates to obtain enough power to operate in high-power mode.

The device changes to high-power mode only when it receives confirmation from the switch. High-power devices can operate in low-power mode on switches that do not support power-negotiation CDP. Devices in low-power mode are not fully functional. Cisco intelligent power management is backward-compatible with CDP with power consumption; the switch responds according to the CDP message that it receives.

CDP is not supported on third-party powered devices; therefore, the switch uses the IEEE classification to determine the power usage of the device. For more information, see the standard. The switch detects a Cisco pre-standard or an IEEE-compliant powered device when the PoE-capable port is in the no-shutdown state, PoE is enabled the default , and the connected device is not being powered by an AC adaptor. After device detection, the switch determines the device power requirements based on its type:.

The initial power allocation is the maximum amount of power that a powered device requires. The switch initially allocates this amount of power when it detects and powers the powered device. As the switch receives CDP messages from the powered device and as the powered device negotiates power levels with the switch through CDP power-negotiation messages, the initial power allocation might be adjusted.

Based on the available power in the power budget, the switch determines if a port can be powered. Table lists these levels. The switch monitors and tracks requests for power and grants power only when it is available. The switch tracks its power budget the amount of power available on the switch for PoE. The switch performs power-accounting calculations when a port is granted or denied power to keep the power budget up to date.

After power is applied to the port, the switch uses CDP to determine the actual power consumption requirement of the connected Cisco powered devices, and the switch adjusts the power budget accordingly. This does not apply to third-party PoE devices. The switch processes a request and either grants or denies power. If the request is granted, the switch updates the power budget. If the request is denied, the switch ensures that power to the port is turned off, generates a syslog message, and updates the LEDs.

Powered devices can also negotiate with the switch for more power. If the switch detects a fault caused by an undervoltage, overvoltage, overtemperature, oscillator-fault, or short-circuit condition, it turns off power to the port, generates a syslog message, and updates the power budget and LEDs.

If the switch discovers a powered device connected to the port and if the switch has enough power, it grants power, updates the power budget, turns on power to the port on a first-come, first-served basis, and updates the LEDs. For LED information, see the hardware installation guide. If the switch has enough power for all the powered devices, they all come up. If enough power is available for all powered devices connected to the switch, power is turned on to all devices.

If there is not enough available PoE, or if a device is disconnected and reconnected while other devices are waiting for power, it cannot be determined which devices are granted or are denied power. If granting power would exceed the system power budget, the switch denies power, ensures that power to the port is turned off, generates a syslog message, and updates the LEDs.

After power has been denied, the switch periodically rechecks the power budget and continues to attempt to grant the request for power. If a device being powered by the switch is then connected to wall power, the switch might continue to power the device. The switch might continue to report that it is still powering the device whether the device is being powered by the switch or receiving power from an AC power source.

If a powered device is removed, the switch automatically detects the disconnect and removes power from the port. You can connect a nonpowered device without damaging it. You can specify the maximum wattage that is allowed on the port. If the IEEE class maximum wattage of the powered device is greater than the configured maximum value, the switch does not provide power to the port. If the switch powers a powered device, but the powered device later requests through CDP messages more than the configured maximum value, the switch removes power to the port.

The power that was allocated to the powered device is reclaimed into the global power budget. If you do not specify a wattage, the switch delivers the maximum value. Use the auto setting on any PoE port. The auto mode is the default setting. The switch allocates the port configured maximum wattage, and the amount is never adjusted through the IEEE class or by CDP messages from the powered device.

Because power is pre-allocated, any powered device that uses less than or equal to the maximum wattage is guaranteed to be powered when it is connected to the static port. The port no longer participates in the first-come, first-served model. However, if the powered-device IEEE class is greater than the maximum wattage, the switch does not supply power to it. If the switch learns through CDP messages that the powered device needs more than the maximum wattage, the powered device is shutdown. If you do not specify a wattage, the switch pre-allocates the maximum value.

The switch powers the port only if it discovers a powered device. Use the static setting on a high-priority interface. Use this mode only when you want to make sure power is never applied to a PoE-capable port, making the port a data-only port. Devices within a single VLAN can communicate directly through any switch. Ports in different VLANs cannot exchange data without going through a routing device.

With a standard Layer 2 switch, ports in different VLANs have to exchange information through a router. With the IP services image, the switch supports two methods of forwarding traffic between interfaces: routing and fallback bridging. Whenever possible, to maintain high performance, forwarding is done by the switch hardware.

Non-IP traffic and traffic with other encapsulation methods can be fallback-bridged by hardware. The switch routes only IP traffic. When IP routing protocol parameters and address configuration are added to an SVI or routed port, any IP traffic received from these ports is routed. When configuring fallback bridging, you assign SVIs or routed ports to bridge groups with each SVI or routed port assigned to only one bridge group. All interfaces in the same group belong to the same bridge domain.

For more information, see Chapter 47, "Configuring Fallback Bridging. You can also configure a range of interfaces see the "Configuring a Range of Interfaces" section. To configure a physical interface port , specify the interface type, module number, and switch port number, and enter interface configuration mode. Port number—The interface number on the switch.

You can identify physical interfaces by looking at the switch. You can also use the show privileged EXEC commands to display information about a specific interface or all the interfaces. The remainder of this chapter primarily provides physical interface configuration procedures. Step 2 Enter the interface global configuration command. Identify the interface type and the interface number, Gigabit Ethernet port 1 in this example:.

Note Entering a space between the interface type and interface number is optional. Step 3 Follow each interface command with the configuration commands that the interface requires. The commands that you enter define the protocols and applications that will run on the interface.

The commands are collected and applied to the interface when you enter another interface command or enter end to return to privileged EXEC mode. You can also configure a range of interfaces by using the interface range or interface range macro global configuration commands. Interfaces configured in a range must be the same type and must be configured with the same feature options. Step 4 After you configure an interface, verify its status by using the show privileged EXEC commands listed in the "Monitoring and Maintaining the Interfaces" section.

Enter the show interfaces privileged EXEC command to see a list of all interfaces on or configured for the switch. A report is provided for each interface that the device supports or for the specified interface. You can use the interface range global configuration command to configure multiple interfaces with the same configuration parameters. When you enter the interface-range configuration mode, all command parameters that you enter are attributed to all interfaces within that range until you exit this mode.

Beginning in privileged EXEC mode, follow these steps to configure a range of interfaces with the same parameters:. Specify the range of interfaces VLANs or physical ports to be configured, and enter interface-range configuration mode. Use the normal configuration commands to apply the configuration parameters to all interfaces in the range.

Each command is executed as it is entered. When using the interface range global configuration command, note these guidelines:. Note When you use the interface range command with port channels, the first and last port-channel number must be active port channels. VLAN interfaces not displayed by the show running-config command cannot be used with the interface range command. This example shows how to use a comma to add different interface type strings to the range to enable Fast Ethernet ports 1 to 3 and Gigabit Ethernet ports 1 and 2 to receive flow-control pause frames:.

If you enter multiple configuration commands while you are in interface-range mode, each command is executed as it is entered. The commands are not batched and executed after you exit interface-range mode. If you exit interface-range configuration mode while the commands are being executed, some commands might not be executed on all interfaces in the range. Wait until the command prompt reappears before exiting interface-range configuration mode. You can create an interface range macro to automatically select a range of interfaces for configuration.

Before you can use the macro keyword in the interface range macro global configuration command string, you must use the define interface-range global configuration command to define the macro. Beginning in privileged EXEC mode, follow these steps to define an interface range macro:. You can now use the normal configuration commands to apply the configuration to all interfaces in the defined macro. When using the define interface-range global configuration command, note these guidelines:.

VLAN interfaces not displayed by the show running-config command cannot be used as interface-ranges. This example shows how to create a multiple-interface macro named macro1 :. Table shows the Ethernet interface default configuration. Note To configure Layer 2 parameters, if the interface is in Layer 3 mode, you must enter the switchport interface configuration command without any parameters to put the interface into Layer 2 mode. This shuts down the interface and then re-enables it, which might generate messages on the device to which the interface is connected.

When you put an interface that is in Layer 3 mode into Layer 2 mode, the previous configuration information related to the affected interface might be lost, and the interface is returned to its default configuration. Layer 2 or switching mode switchport command. Flow control is set to receive : off. It is always off for sent packets. Disabled on all Ethernet ports. Disabled not blocked Layer 2 interfaces only.

See the "Configuring Port Blocking" section on page See the "Default Storm Control Configuration" section on page Disabled Layer 2 interfaces only. See the "Configuring Protected Ports" section on page See the "Default Port Security Configuration" section on page This is regardless of whether auto-MIDX is enabled on the switch port.

For more information, see the "Dual-Purpose Uplink Ports" section. Beginning in privileged EXEC mode, follow these steps to select which dual-purpose uplink to activate so that you can set the speed and duplex. This procedure is optional. Specify the dual-purpose uplink port to be configured, and enter interface configuration mode. Select the interface and type of a dual-purpose uplink port.

The keywords have these meanings:. When link up is achieved, the switch disables the other type until the active link goes down. When the active link goes down, the switch enables both types until one of them links up. In auto-select mode, the switch configures both types with autonegotiation of speed and duplex the default.

Depending on the type of installed SFP module, the switch might not be able to dynamically select it. For more information, see the information that follows this procedure. If you connect an SFP module to this port, it cannot attain a link even if the RJ side is down or is not connected. You can configure the speed and duplex settings consistent with this interface type.

Based on the type of installed SFP module, you can configure the speed and duplex settings consistent with this interface type. For information about setting the speed and duplex, see the "Speed and Duplex Configuration Guidelines" section. To return to the default setting, use the media-type auto interface or the no media-type interface configuration commands. If you configure auto-select , you cannot configure the speed and duplex interface configuration commands.

When the switch powers on or when you enable a dual-purpose uplink port through the shutdown and the no shutdown interface configuration commands, the switch gives preference to the SFP module interface. In all other situations, the switch selects the active link based on which type first links up. In full-duplex mode, two stations can send and receive traffic at the same time.

Duplex options are not supported. These modules support full- and half- duplex options but do not support autonegotiation. For information about which SFP modules are supported on your switch, see the product release notes. Beginning in privileged EXEC mode, follow these steps to set the speed and duplex mode for a physical interface:.

Specify the physical interface to be configured, and enter interface configuration mode. If you use the 10 , , or the keywords with the auto keyword, the port autonegotiates only at the specified speeds. For more information about speed settings, see the "Speed and Duplex Configuration Guidelines" section. For more information about duplex settings, see the "Speed and Duplex Configuration Guidelines" section.

Use the no speed and no duplex interface configuration commands to return the interface to the default speed and duplex settings autonegotiate. To return all interface settings to the defaults, use the default interface interface-id interface configuration command. Flow control enables connected Ethernet ports to control traffic rates during congestion by allowing congested nodes to pause link operation at the other end.

If one port experiences congestion and cannot receive any more traffic, it notifies the other port by sending a pause frame to stop sending until the condition clears. Upon receipt of a pause frame, the sending device stops sending any data packets, which prevents any loss of data packets during the congestion period. Note Ports on the switch can receive, but not send, pause frames.

You use the flowcontrol interface configuration command to set the interface's ability to receive pause frames to on , off , or desired. The default state is off. When set to desired , an interface can operate with an attached device that is required to send flow-control packets or with an attached device that is not required to but can send flow-control packets. In case of congestion, no indication is given to the link partner, and no pause frames are sent or received by either device.

Note For details on the command settings and the resulting flow control resolution on local and remote ports, see the flowcontrol interface configuration command in the command reference for this release.

Beginning in privileged EXEC mode, follow these steps to configure flow control on an interface:. To disable flow control, use the flowcontrol receive off interface configuration command. When automatic medium-dependent interface crossover auto-MDIX is enabled on an interface, the interface automatically detects the required cable connection type straight through or crossover and configures the connection appropriately. When connecting switches without the auto-MDIX feature, you must use straight-through cables to connect to devices such as servers, workstations, or routers and crossover cables to connect to other switches or repeaters.

With auto-MDIX enabled, you can use either type of cable to connect to other devices, and the interface automatically corrects for any incorrect cabling. For more information about cabling requirements, see the hardware installation guide. Auto-MDIX is enabled by default. When you enable auto-MDIX, you must also set the interface speed and duplex to auto so that the feature operates correctly.

Table shows the link states that result from auto-MDIX settings and correct and incorrect cabling. Configure the interface to autonegotiate duplex mode with the connected device. To disable auto-MDIX, use the no mdix auto interface configuration command. For most situations, the default configuration auto mode works well, providing plug-and-play operation. No further configuration is required. However, use the following procedure to give a PoE port higher priority, to make it data only, or to specify a maximum wattage to disallow high-power powered devices on a port.

Note When you make PoE configuration changes, the port being configured drops power. Depending on the new configuration, the state of the other PoE ports, and the state of the power budget, the port might not be powered up again. For example, port 1 is in the auto and on state, and you configure it for static mode. The switch removes power from port 1, detects the powered device, and repowers the port.

If port 1 is in the auto and on state and you configure it with a maximum wattage of 10 W, the switch removes power from the port and then redetects the powered device. The switch repowers the port only if the powered device is a Class 1, Class 2, or a Cisco-only powered device. Specify the physical port to be configured, and enter interface configuration mode.

If enough power is available, automatically allocate power to the PoE port after device detection. This is the default setting. The range is to milliwatts. If no value is specified, the maximum is allowed milliwatts. Note If a port has a Cisco powered device connected to it, do not use the power inline never command to configure the port.

A false link-up can occur, placing the port into an error-disabled state. Pre-allocate reserve power for a port before the switch discovers the powered device. The switch reserves power for this port even when no device is connected and guarantees that power will be provided upon device detection. The switch allocates power to a port configured in static mode before it allocates power to a port configured in auto mode. For information about the output of the show power inline user EXEC command, see the command reference for this release.

When Cisco powered devices are connected to PoE ports, the switch uses Cisco Discovery Protocol CDP to determine the actual power consumption of the devices, and the switch adjusts the power budget accordingly. For these devices, when the switch grants a power request, the switch adjusts the power budget according to the powered-device IEEE classification. If the powered device is a Class 0 class status unknown or a Class 3, the switch budgets 15, milliwatts for the device, regardless of the actual amount of power needed.

If the powered device reports a higher class than its actual consumption or does not support power classification defaults to Class 0 , the switch can power fewer devices because it uses the IEEE class information to track the global power budget. By using the power inline consumption wattage configuration command, you can override the default power requirement specified by the IEEE classification.

The difference between what is mandated by the IEEE classification and what is actually needed by the device is reclaimed into the global power budget for use by additional devices. You can then extend the switch power budget and use it more effectively. For example, if the switch budgets 15, milliwatts on each PoE port, you can connect only 24 Class 0 powered devices. If your Class 0 device power requirement is actually milliwatts, you can set the consumption wattage to milliwatts and connect up to 48 devices.

The total PoE output power available on a port or port switch is , milliwatts. Note When you manually configure the power budget, you must also consider the power loss over the cable between the switch and the powered device. When you enter the power inline consumption default wattage or the no power inline consumption default global configuration command, or the power inline consumption wattage or the no power inline consumption interface configuration command this caution message appears:.

If the power supply is over-subscribed to by up to 20 percent, the switch continues to operate but its reliability is reduced.

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Cisco Switch basic Configuration - Cisco Switch Configuration Step by Step

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To disable the DHCPv6 server function on an interface, use the no ipv6 dhcp server interface configuration command. This example shows how to configure a pool called engineering with an IPv6 address prefix :. This example shows how to configure a pool called testgroup with three link-addresses and an IPv6 address prefix:.

This example shows how to configure a pool called with vendor-specific options:. Optional Enable the interface to request the vendor-specific option. Verify that the DHCPv6 client is enabled on an interface. To disable the DHCPv6 client function, use the no ipv6 address dhcp interface configuration command. To remove the DHCPv6 client request, use the no ipv6 address dhcp client request interface configuration command.

This example shows how to acquire an IPv6 address and to enable the rapid-commit option:. ICMP rate limiting is enabled by default with a default interval between error messages of milliseconds and a bucket size maximum number of tokens to be stored in a bucket of To return to the default configuration, use the no ipv6 icmp error-interval global configuration command.

This example shows how to configure an IPv6 ICMP error message interval of 50 milliseconds and a bucket size of 20 tokens. To route IPv6 unicast packets, you must first globally configure IPv6 unicast packet forwarding by using the ipv6 unicast-routing global configuration command. You must configure an IPv6 address and IPv6 processing on an interface by using the ipv6 address interface configuration command. Before configuring a static IPv6 route, you must enable routing by using the ip routing global configuration command, enable the forwarding of IPv6 packets by using the ipv6 unicast-routing global configuration command, and enable IPv6 on at least one Layer 3 interface by configuring an IPv6 address on the interface.

Note You must specify an interface-id when using a link-local address as the next hop the link-local next hop must also be an adjacent router. Verify your entries by displaying the contents of the IPv6 routing table. This example shows how to configure a floating static route with an administrative distance of to an interface:. Before configuring the switch to run IPv6 RIP, you must enable routing by using the ip routing global configuration command, enable the forwarding of IPv6 packets by using the ipv6 unicast-routing global configuration command, and enable IPv6 on any Layer 3 interfaces on which IPv6 RIP is to be enabled.

The range is from 1 to 64, and the default is 4 routes. Display the contents of the IPv6 routing table. To disable a RIP routing process, use the no ipv6 router rip name global configuration command. To disable the RIP routing process for an interface, use the no ipv6 rip name interface configuration command. This example shows how to enable the RIP routing process cisco with a maximum of eight equal-cost routes and to enable it on an interface:.

Enable OSPF router configuration mode for the process. It is locally assigned and can be a positive integer from 1 to Optional Consolidate and summarize routes at an area boundary. The range is from 1 to 64, and the default is Display general information about OSPF routing processes.

To disable an OSPF routing process, use the no ipv6 router ospf process-id global configuration command. To disable the OSPF routing process for an interface, use the no ipv6 ospf process-id area area-id interface configuration command. EIGRP for IPv6 is enabled when you configure the ipv6 router eigrp as-number command and ipv6 eigrp as-number command on the interface. To set an explicit router ID, use the show ipv6 eigrp command to identify the configured router IDs, and then use the eigrp router-id ip-address command.

Use the passive-interface default command to make all interfaces passive, and then use the no passive-interface command on selected interfaces to make them active. Enter interface configuration mode, and enter the Layer 3 interface on which you want to specify the standby version. Enter 2 to change the HSRP version. The default is 1. Configure the router to preempt , which means that when the local router has a higher priority than the active router, it assumes control as the active router.

Use the no form of the command to restore the default values. Set a priority value used in choosing the active router. The range is 1 to ; the default priority is The highest number represents the highest priority. Other configurations are optional. For complete syntax and usage information on these commands, see the Cisco IOS command reference publications.

Table Commands for Monitoring IPv6. Display the previous 20 connections to the HTTP server, including the IP address accessed and the time when the connection was closed. Display a list of the last 20 requests made by the HTTP client to the server. This is an example of the output from the show ipv6 interface privileged EXEC command:. This is an example of the output from the show ipv6 cef privileged EXEC command:.

This is an example of the output from the show ipv6 protocols privileged EXEC command:. This is an example of the output from the show ipv6 rip privileged EXEC command:. This is an example of the output from the show ipv6 static privileged EXEC command:. This is an example of the output from the show ipv6 neighbor privileged EXEC command:. This is an example of the output from the show ipv6 route privileged EXEC command:. This is an example of the output from the show ipv6 traffic privileged EXEC command.

Skip to content Skip to search Skip to footer. Book Contents Book Contents. Find Matches in This Book. Log in to Save Content. PDF - Complete Book Updated: April 15, Chapter: Configuring IPv6 Routing. This is an example of an IPv6 address: FCFB For easier implementation, leading zeros in each field are optional.

Aggregatable global unicast addresses are IPv6 addresses from the aggregatable global unicast prefix. The address structure enables strict aggregation of routing prefixes and limits the number of routing table entries in the global routing table. These addresses are used on links that are aggregated through organizations and eventually to the Internet service provider. Link-local addresses are used in the neighbor discovery protocol NDP and the stateless autoconfiguration process.

Nodes on a local link use link-local addresses and do not require globally unique addresses to communicate. IPv6 routers do not forward packets with link-local source or destination addresses to other links. IPv6 Stateless Autoconfiguration and Duplicate Address Detection The switch uses stateless autoconfiguration to manage link, subnet, and site addressing changes, such as management of host and mobile IP addresses.

IPv6 packets are not supported. Full IPv6 QoS is not supported. IPv6 QoS trust is supported. If you do not plan to use IPv6, do not use the dual stack template because this template results in less TCAM capacity for each resource. Static Routes for IPv6 Static routes are manually configured and define an explicit route between two networking devices. A switch capable of graceful restart uses it when these failures occur: A route processor failure that results in changeover to the standby route processor A planned route processor changeover to the standby route processor The graceful restart feature requires that neighboring switches be graceful-restart aware.

ICMPv6 redirect functionality is not supported for IPv6 host routes routes used to reach a specific host or for IPv6 routes with masks greater than 64 bits. The switch cannot redirect hosts to a better first-hop router for a specific destination that is reachable through a host route or through a route with masks greater than 64 bits. Load balancing using equal cost and unequal cost routes is not supported for IPv6 host routes or for IPv6 routes with a mask greater than 64 bits.

Bridged IPv6 packets with hop-by-hop extension headers are forwarded in software. In IPv4, these packets are routed in software, but bridged in hardware. Interface counters for IPv6 traffic include software-forwarded traffic only; hardware- switched traffic is excluded. The switch cannot apply QoS classification or policy-based routing on source-routed IPv6 packets in hardware. IPv6 addresses None configured. Not all features discussed in this chapter are supported by the Catalyst switch running the IP services image.

In the ipv6 address interface configuration command, you must enter the ipv6-address and ipv6-prefix variables with the address specified in hexadecimal using bit values between colons. Step 4 reload Reload the operating system. Step 5 configure terminal Enter global configuration mode after the switch reloads. Step 6 interface interface-id Enter interface configuration mode, and specify the Layer 3 interface to configure. Step 7 no switchport Remove the interface from Layer 2 configuration mode if it is a physical interface.

Step 9 exit Return to global configuration mode. Step 10 ip routing Enable IP routing on the switch. Step 11 ipv6 unicast-routing Enable forwarding of IPv6 unicast data packets. Step 13 show ipv6 interface interface-id Verify your entries. Step 14 copy running-config startup-config Optional Save your entries in the configuration file.

Configuring Default Router Preference Router advertisement messages are sent with the default router pref erence DRP configured by the ipv6 nd router-preference interface configuration command. Command Purpose Step 1 configure terminal Enter global configuration mode. Step 2 interface interface-id Enter interface configuration mode, and enter the Layer 3 interface on which you want to specify the DRP.

Step 5 show ipv6 interface Verify the configuration. Step 6 copy running-config startup-config Optional Save your entries in the configuration file. Step 2 ip routing Enable routing on the switch. Step 3 ipv6 unicast-routing Enable forwarding of IPv6 data packets on the switch. Step 4 interface interface-id Enter interface configuration mode, and specify the Layer 3 interface to configure.

Step 5 no switchport Remove the interface from Layer 2 configuration mode if it is a physical interface. Step 6 ip address ip-address mask [ secondary ] Specify a primary or secondary IPv4 address for the interface. Step 9 show interface interface-id show ip interface interface-id show ipv6 interface interface-id Verify your entries.

Step 10 copy running-config startup-config Optional Save your entries in the configuration file. The switch can act as a DHCPv6 client, server, or relay agent. The DHCPv6 client, server, and relay function are mutually exclusive on an interface. Step 5 vendor-specific vendor-id Optional Enter vendor-specific configuration mode and enter a vendor-specific identification number.

Step 8 exit Return to global configuration mode. Step 9 interface interface-id Enter interface configuration mode, and specify the interface to configure. Step 10 ipv6 dhcp server [ poolname automatic ] [ rapid-commit ] [ preference value] [ allow-hint ] Enable DHCPv6 server function on an interface.

The range is from 0 to The preference value default is 0. By default, the server ignores client hints. Step 13 copy running-config startup-config Optional Save your entries in the configuration file. Step 2 interface interface-id Enter interface configuration mode, and specify the interface to configure. Step 4 ipv6 dhcp client request [ vendor-specific ] Optional Enable the interface to request the vendor-specific option.

Configuring IPv6 ICMP Rate Limiting ICMP rate limiting is enabled by default with a default interval between error messages of milliseconds and a bucket size maximum number of tokens to be stored in a bucket of Step 2 ipv6 icmp error-interval interval [ bucketsize ] Configure the interval and bucket size for IPv6 ICMP error messages: interval— The interval in milliseconds between tokens being added to the bucket.

The range is from 0 to milliseconds. The range is from 1 to Step 4 show ipv6 interface [ interface-id ] Verify your entries. Step 5 copy running-config startup-config Optional Save your entries in the configuration file. Configuring Static Routes for IPv6 Before configuring a static IPv6 route, you must enable routing by using the ip routing global configuration command, enable the forwarding of IPv6 packets by using the ipv6 unicast-routing global configuration command, and enable IPv6 on at least one Layer 3 interface by configuring an IPv6 address on the interface.

It can also be a hostname when static host routes are configured. A decimal value that shows how many of the high-order contiguous bits of the address comprise the prefix the network portion of the address. A slash mark must precede the decimal value.

The IPv6 address of the next hop need not be directly connected; recursion is done to find the IPv6 address of the directly connected next hop. The address must be specified in hexadecimal using bit values between colons.

With point-to-point interfaces, there is no need to specify the IPv6 address of the next hop. With broadcast interfaces, you should always specify the IPv6 address of the next hop, or ensure that the specified prefix is assigned to the link, specifying a link-local address as the next hop.

You can optionally specify the IPv6 address of the next hop to which packets are sent. The range is 1 to ; the default value is 1, which gives static routes precedence over any other type of route except connected routes. To configure a floating static route, use an administrative distance greater than that of the dynamic routing protocol.

The recursive keyword is mutually exclusive with the interface keyword, but it can be used with or without the IPv6 prefix included in the command syntax. Step 2 ipv6 router rip name Configure an IPv6 RIP routing process, and enter router configuration mode for the process.

Step 4 exit Return to global configuration mode. Step 5 interface interface-id Enter interface configuration mode, and specify the Layer 3 interface to configure. Step 9 show ipv6 rip [ name ] [ interface interface-id ] [ database ] [ next-hops ] or show ipv6 route rip [ updated ] Display information about IPv6 RIP processes.

Follow these guidelines: The switch must be running the IP services image. Be careful when changing the defaults for IPv6 commands. It can be specified as either a decimal value or as an IPv6 prefix. The Type 3 summary LSA is suppressed, and component networks remain hidden from other networks.

The value can be 0 to Step 4 maximum paths number-paths Optional Define the maximum number of equal-cost routes to the same destination that IPv6 OSPF should enter in the routing table. Step 5 exit Return to global configuration mode.

Step 9 show ipv6 ospf [ process-id ] [ area-id ] interface [ interface-id ] or show ipv6 ospf [ process-id ] [ area-id ] Display information about OSPF interfaces. The switch must be running the IP services image. Step 2 interface interface-id Enter interface configuration mode, and enter the Layer 3 interface on which you want to specify the standby version.

Depending on your software version and licensing and link hardware support, SAP negotiation can use one of these modes of operation:. It is not supported on:. The switch also does not support security group ACLs. You can configure Cisco TrustSec link-layer security in Optional Displays Cisco TrustSec credentials configured on the switch.

This example shows how to create Cisco TrustSec credentials:. For You enable Cisco TrustSec link-layer switch-to-switch security on an interface that connects to another Cisco TrustSec device. When configuring Cisco TrustSec in If you select GCM without the required license, the interface is forced to a link-down state.

Enters interface configuration mode for the uplink interface. Note The interface must be an uplink interface on the network services module. Configures the uplink interface to perform NDAC authentication. Optional Configures the SAP operation mode on the interface. The interface negotiates with the peer for a mutually acceptable mode. Enter the acceptable modes in your order of preference. Note If the interface is not capable of data link encryption, no-encap is the default and the only available SAP operating mode.

SGT is not supported. Note Although visible in the CLI help, the timer reauthentication and propagate sgt keywords are not supported. Exits Cisco TrustSec Optional Verifies the configuration by displaying TrustSec-related interface characteristics. This example shows how to enable Cisco TrustSec authentication in This example shows output from the show cts interface summary command:.

This example shows output from the show cts interface command for a specified interface:. If your switch does not have access to an authentication server or if You must manually configure the interface on each end of the connection. When manually configuring Cisco TrustSec on an interface, consider these usage guidelines and restrictions:.

The protection is selected by the supplicant according to supplicant preference. The SAP operation mode options:. Use the no form of this command when the peer is incapable of processing a SGT. The no propagate sgt command prevents the interface from transmitting the SGT to the peer and is required in manual mode.

This example shows how to configure Cisco TrustSec authentication in manual mode on an interface:. This example shows output from the show cts interface command for the specified interface:. This example shows the configuration necessary for a seed and non-seed device for Cisco TrustSec switch-to-switch security. Skip to content Skip to search Skip to footer. Book Contents Book Contents. Find Matches in This Book. Log in to Save Content.

PDF - Complete Book Updated: April 15, You can configure these options: Policy name, not to exceed 16 ASCII characters Confidentiality encryption offset of 0, 30, or 50 bytes for each physical interface Replay protection You can configure MACsec window size, as defined by the number of out-of-order frames that are accepted. Virtual Ports You use virtual ports for multiple secured connectivity associations on a single physical port.

Figure MACsec in Standard Multiple-Host Mode - Unsecured We do not recommend using multiple-host mode because after the first successful client, authentication is not required for other clients, which is not secure. Command Purpose Step 1 configure terminal Enters global configuration mode. Step 3 replay-protection window-size frames Enables replay protection, and configure the window size in number of frames. Step 5 show mka policy Verifies your entries.

Step 6 copy running-config startup-config Optional Saves your entries in the configuration file. Step 2 interface interface-id Identifies the MACsec interface, and enter interface configuration mode. Step 4 switchport mode access Configures the interface as an access port. Step 5 macsec Enables Step 6 authentication event linksec fail action authorize vlan vlan-id Optional Specifies that the switch processes authentication link-security failures resulting from unrecognized user credentials by authorizing a restricted VLAN on the port after a failed authentication attempt.

Step 7 authentication host-mode multi-domain Configures authentication manager mode on the port to allow both a host and a voice device to be authenticated on the Step 8 authentication linksec policy must-secure Sets the LinkSec security policy to secure the session with MACsec if the peer is available. Step 9 authentication port-control auto Enables Step 10 authentication violation protect Configures the port to drop unexpected incoming MAC addresses when a new device connects to a port or when a device connects to a port after the maximum number of devices are connected to that port.

Step 12 dot1x pae authenticator Configure the port as an Step 15 show authentication session interface interface-id Verifies the authorized session security status. Step 16 copy running-config startup-config Optional Saves your entries in the configuration file.

The device-id argument has a maximum length of 32 characters and is case sensitive. Step 3 copy running-config startup-config Optional Saves your entries in the configuration file. This example shows how to create Cisco TrustSec credentials: Switch cts credentials id trustsec password mypassword CTS device ID and password have been inserted in the local keystore. Please make sure that the same ID and password are configured in the server database. Step 2 interface interface-id Enters interface configuration mode for the uplink interface.

Step 4 sap mode-list mode1 [ mode2 [ mode3 [ mode4 ]]] Optional Configures the SAP operation mode on the interface. Choices for mode are: gcm-encrypt —Authentication and encryption Note Select this mode for MACsec authentication and encryption if your software license supports MACsec encryption.

Step 5 exit Exits Cisco TrustSec Step 7 show cts interface [ interface-id brief summary ] Optional Verifies the configuration by displaying TrustSec-related interface characteristics. Step 8 copy running-config startup-config Optional Saves your entries in the configuration file. When manually configuring Cisco TrustSec on an interface, consider these usage guidelines and restrictions: If no SAP parameters are defined, MACsec encapsulation or encryption will not be performed.

Step 3 cts manual Enters Cisco TrustSec manual configuration mode. Step 5 no propagate sgt Use the no form of this command when the peer is incapable of processing a SGT. Step 6 exit Exits Cisco TrustSec Step 8 show cts interface [ interface-id brief summary ] Optional Verifies the configuration by displaying TrustSec-related interface characteristics.

Step 9 copy running-config startup-config Optional Saves your entries in the configuration file. Was this Document Helpful? Yes No Feedback. Configures the interface as an access port. Verifies the authorized session security status.

Enters Cisco TrustSec manual configuration mode.

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