Cisco Series Router Software Configuration Guide, Cisco IOS how to configure the IPv6 Port based Access Control List (PACL). The IPv6 PACL feature provides the ability to provide access control (permit or deny) on Layer 2 switch ports for IPv6 traffic. To configure a PACL on a trunk port, you must first configure port prefer mode. The configuration commands to apply a PACL on a trunk or dynamic. REMOTE CONTROL ANDROID TEAMVIEWER Заказы в меж ТЦ имя, адрес доставка в транспортные компании. Развоз продукта по городу для производства мыла и свеч ручной работы: мыльная 12 до 17 часов масла, формы. Новейший городской телефон 8. Каждую пятницу с пн имя, адрес.
PACLs are explained in more detail in the following sections:. In merge mode, the following configurations are not allowed:. To configure a PACL on a trunk port, you must first configure port prefer mode. The configuration commands to apply a PACL on a trunk or dynamic port will not be available until you configure the port in port prefer mode by entering the access-group mode prefer port interface command.
If you reconfigure a port from Layer 2 to Layer 3, any PACL configured on the port becomes inactive but remains in the configuration. If you subsequently configure the port as Layer 2, any PACL configured on the port becomes active again.
In merge mode, online insertion or removal of a switching module also triggers a remerge, if ports on the module have PACLs configured. The following sections describe interactions between the different types of ACL:. For an incoming packet on a physical port, the PACL is applied first.
The same process happens in reverse in the egress direction. However, there is currently no hardware support for output PACLs. The one exception to this rule is when the packets are forwarded in the software by the route processor RP. Two examples where the packets are forwarded in the software are as follows:. In merge mode, the ACLs are applied in the following order:. PACL for the ingress port. Figure shows how ACLs are applied on routed and Layer 3-switched packets. Figure shows how ACLs are applied on packets that need multicast expansion.
For packets that need multicast expansion, the ACLs are applied in the following order:. Packets that need multicast expansion:. Packets after multicast expansion:. Packets originating from router:. This section describes how to configure PACLs. Consider the following guidelines when configuring PACLs:. Enters interface configuration mode for a Layer 2 port.
Applies a numbered or named ACL to the Layer 2 interface. To configure the access mode on a Layer 2 interface, perform this task:. Sets the mode for this Layer 2 interface. The no prefix sets the mode to the default value which is merge.
This example shows how to configure an interface to use prefer port mode:. This example shows how to configure an interface to use merge mode:. To display information about an ACL configuration on Layer 2 interfaces, perform one of these tasks:. Shows the IP access group configuration on the interface.
Shows the MAC access group configuration on the interface. Shows the access group mode configuration on the interface. Consider the following guidelines when configuring VACLs:. If the translated flow is not subject to access control, the flow might be subject to access control after the translation because of the VACL configuration.
Defines the VLAN access map. Optionally, you can specify the VLAN access map sequence number. When defining a VLAN access map, note the following information:. To configure a match clause in a VLAN access map sequence, perform this task:. Configures the match clause in a VLAN access map sequence. Deletes the match clause in a VLAN access map sequence.
When configuring a match clause in a VLAN access map sequence, note the following information:. To configure an action clause in a VLAN access map sequence, perform this task:. Configures the action clause in a VLAN access map sequence. Deletes the action clause in from the VLAN access map sequence.
When configuring an action clause in a VLAN access map sequence, note the following information:. When applying a VLAN access map, note the following information:. To verify VLAN access map configuration, perform this task:. The map is applied to VLAN 12 to A port configured to capture VACL-filtered traffic is called a capture port. The default is all. Router config-if switchport capture. Configures the port to capture VACL-filtered traffic.
When configuring a capture port, note the following information:. This example shows how to display VLAN access map information:. Optional Assigns a name to the MAC address of the source host. Configures an access control entry ACE to permit traffic from the named host to any other address. Hosts can be specified by a name or by a MAC address. Configures an ACE to permit traffic from the named host to one other host.
Router config-ext-macl exit. To allow local communication by the host, use the local keyword. Router config-access-map exit. Router config-if mac packet-classify. Router config-if exit. Router config exit. Router show vlan mac-pbf config. Router clear vlan mac-pbf counters.
To clear this counter, enter the clear vlan mac-pbf counters command. Log messages are generated on a per-flow basis. When a log message is generated, the timer and packet count is reset. These restrictions apply to VACL logging:. Sets the log table size. The content of the log table can be deleted by setting the maxflow number to 0. The default is with a valid range of 0 to When the log table is full, logged packets from new flows are dropped by the software. Router config vlan access-log ratelimit pps.
Sets the maximum redirect VACL logging packet rate. The default packet rate is packets per second with a valid range of 0 to Packets exceeding the limit are dropped by the hardware. Sets the logging threshold. A logging message is generated if the threshold for a flow is reached before the 5-minute interval. By default, no threshold is set.
Router show vlan access-log config. Router show vlan access-log statistics. Optional Displays packet and message counts and other statistics. This example shows how to configure global VACL logging in hardware:. Skip to content Skip to search Skip to footer.
Book Contents Book Contents. Packets can either enter the VLAN through a switch port or through a routed port after being routed. Router ACLs are applied on interfaces for specific directions inbound or outbound. You can apply one IP access list in each direction. When a single router ACL is used by multiple features, it is examined multiple times. The access list type determines the input to the matching operation:. The switch examines ACLs associated with features configured on a given interface and a direction.
As packets enter the switch on an interface, ACLs associated with all inbound features configured on that interface are examined. After packets are routed and before they are forwarded to the next hop, all ACLs associated with outbound features configured on the egress interface are examined.
For example, you can use access lists to allow one host to access a part of a network, but prevent another host from accessing the same part. You can also apply ACLs to Layer 2 interfaces on a switch. As with router ACLs, the switch examines ACLs associated with features configured on a given interface and permits or denies packet forwarding based on how the packet matches the entries in the ACL. You can enforce VLAN maps only on packets going through the switch; you cannot enforce VLAN maps on traffic between hosts on a hub or on another switch connected to this switch.
With VLAN maps, forwarding packets is permitted or denied, based on the action specified in the map. This section describes how to determine whether ACLs are processed in hardware or in software:. Note Packets that require logging are processed in software.
A copy of the packets is sent to the CPU for logging while the actual packets are forwarded in hardware so that non-logged packet processing is not impacted. By default, the Catalyst series switch sends ICMP unreachable messages when a packet is denied by an access list; these packets are not dropped in hardware but are forwarded to the switch so that it can generate the ICMP unreachable message.
To drop access-list denied packets in hardware on the input interface, you must disable ICMP unreachable messages using the no ip unreachables interface configuration command. The ip unreachables command is enabled by default. Two types of hardware resources are consumed when you program ACLs: entries and masks. If either one of these resources is exhausted, no additional ACLs can be programmed into hardware.
ACLs are inoperative until the reloading process is complete. If the masks on a system are exhausted, but entries are available, changing the programming scheme from packed to scattered might free up masks, allowing additional ACLs to be programmed into hardware.
Note TCAM resources are not consumed when the interface is in a down state. Note To determine whether the scattered algorithm is configured, use the show running config command. If scattered is configured, the line access-list hardware entries scattered appears.
The following output was collected from a switch running in packed mode. Observe that 89 percent of the masks are required to program only 49 percent of the ACL entries. The TCAM is divided into regions, each of which holds different kinds of entries.
The following table lists the entries and masks counts for each of the supported supervisor engines. One region in a TCAM type might be filled while the other region still has free space. When this happens, the regions can be resized to move the free entries from the region where they are not needed to the region where they are needed.
Each TCAM type has its own independent region balance. You cannot shift entries between TCAM types. To determine whether region resizing would be beneficial, use the show platform hardware acl statistics utilization brief command:. After adjusting the region balance, the PortAndVlan region has more resources allocated to it, and the PortOrVlan region has fewer resources. A similar configuration can also be performed for QoS.
The following sections describe guidelines and restrictions for configuring ACLs that include Layer 4 port operations:. You can specify these operator types, each of which uses one Layer 4 operation in the hardware:. We recommend that you not specify more than six different operations on the same ACL.
If you exceed this number, each new operation might cause the affected ACE access control entry to be translated into multiple ACEs in hardware. If you exceed this number, the affected ACE might be processed in software. For example, the following ACL contains three different Layer 4 operations because gt 10 and gt 11 are considered two different Layer 4 operations:. Note The eq operator can be used an unlimited number of times because eq does not use a Layer 4 operation in hardware.
More than six Layer 4 operations trigger an attempt to translate the excess operations into multiple ACEs in hardware. If this attempt fails, packets are processed in software. The translation process is less likely to succeed on large ACLs with a great number of Layer 4 operations, and on switches with large numbers of ACLs configured.
The precise limit depends on how many other ACLs are configured and which specific Layer 4 operations are used by the ACLs being translated. The eq operator does not require any Layer 4 operations and can be used any number of times. Access lists and are identical; established is shorthand for rst and ack.
Because four source and two destination operations exist, access list , below, is processed in hardware:. In the following code, the Layer 4 operations for the third ACE trigger an attempt to translate dst lt into multiple ACEs in hardware, because three source and three destination operations exist. If the translation attempt fails, the third ACE is processed in software. Similarly, for access list , below, the third ACE triggers an attempt to translate dst gt into multiple ACEs in hardware.
If the attempt fails, the third ACE is processed in software. Although the operations for source and destination ports look similar, they are considered different Layer 4 operations. Note Remember that source port lt 80 and destination port lt 80 are considered different operations. For example, if a packet must be logged, a copy is sent to the CPU for logging, but the forwarding or dropping is performed in the hardware.
Although logging slows the CPU, it does not affect the forwarding rate. This sequence of events would happen under the following conditions:. To clear MAC address-based blocking, use the no form of this command without the drop keyword. This example shows how to block all unicast traffic to or from MAC address The procedure is similar to that of configuring other extended named ACLs. You can use a number to name the access list, but MAC access list numbers from to are not supported.
You can use the no mac access-list extended name global configuration command to delete the entire ACL. This example shows how to create and display an access list named mac1 , denying only EtherType DECnet Phase IV traffic, but permitting all other types of traffic. VLAN maps have no direction. To filter traffic in a specific direction by using a VLAN map, you need to include an ACL with specific source or destination addresses. If there is a match clause for that type of packet IP or MAC in the VLAN map, the default action is to drop the packet if the packet does not match any of the entries within the map.
If there is no match clause for that type of packet, the default is to forward the packet. Step 3 In access map configuration mode, you have the optional to enter an action forward [the default] or drop and enter the match command to specify an IP packet or a non-IP packet and to match the packet against one or more ACLs standard or extended. If a match clause is not specified, the action is applied to all packets. The match clause can be used to match against multiple ACLs.
If a packet matches any of the specified ACLs, the action is applied. If there is no match clause in the VLAN map for that type of packet, and no action specified, the packet is forwarded. The order of entries in a VLAN map is important. A packet that comes into the switch is tested against the first entry in the VLAN map.
If it matches, the action specified for that part of the VLAN map is taken. If there is no match, the packet is tested against the next entry in the map. If there is no match clause for that type of packet in the VLAN map, the default is to forward the packet. Each VLAN map consists of an ordered series of entries. To create, add to, or delete a VLAN map entry, perform this task:. Creates a VLAN map, and give it a name and optionally a number.
The number is the sequence number of the entry within the map. When you create VLAN maps with the same name, numbers are assigned sequentially in increments of When modifying or deleting maps, you can enter the number of the map entry that you want to modify or delete. Matches the packet using either the IP or MAC address against one or more standard or extended access lists. Note that packets are matched only against access lists of the correct protocol type.
IP packets are compared with standard or extended IP access lists. If a match clause is not specified, the action is taken on all packets. You can use the no vlan access-map name global configuration command to delete a map. You can use the no vlan access-map name number global configuration command to delete a single sequence entry from within the map. You can use the no action access-map configuration command to enforce the default action, which is to forward.
VLAN maps do not use the specific permit or deny keywords. A permit in the ACL is the same as a match. A deny in the ACL means no match. Because there is a match clause for IP packets in the VLAN map, the default action is to drop any IP packet that does not match any of the match clauses. This example shows how to create a VLAN map to permit a packet.
By applying standard ACL and the extended named access lists igmp-match and tcp-match , the VLAN map is configured to do the following:. By applying access lists tcp-match and good-hosts, the VLAN map is configured to do the following:. Spaces around comma, and dash, are optional. Figure shows a typical wiring closet configuration.
To configure this scenario, you would do the following:. Next, create a VLAN access map named map2 so that traffic that matches the http access list is dropped and all other IP traffic is forwarded, as follows:. Figure shows how to restrict access to a server on another VLAN. In this example, server Then it permits all other IP traffic. This is a sample output of the show vlan access-map command:. Note Sequence 30 does not have a match clause.
All packets IP as well as non-IP are matched against it and dropped. When possible, try to write the ACL so that all entries have a single action except for the final, default action.
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