Table Of Contents
128-Line Input Access Control Lists on Cisco 12000 Series 8-Port OC-3 STM-1 ATM Line Cards
This feature was made available on the 8-Port OC-3 STM-1 ATM line card for Cisco 12000 Series Internet Routers.
This feature module describes the 128-line input access control list (ACL) feature for the 8-Port OC-3 STM-1 ATM line card on Cisco 12000 Series Internet Routers.
This document includes the following sections:
Prior to the 12.0(23)S Cisco IOS software release, no input ACL support was provided for the 8-Port OC-3 STM-1 ATM line card on Cisco 12000 Series Internet Routers. With this release, you can now configure input ACLs on a per-subinterface basis on the 8-Port OC-3 STM-1 ATM line card.
The use of input ACLs on the 8-Port OC-3 STM-1 ATM line card is subject to the following restrictions:
•Only input ACLs are supported.
•A maximum of 16 distinct input ACLs per line card and 128 ACL entries per ACL are supported in PSA microcode due to memory limitations. Additional ACLs are processed by the line card CPU rather than the PSA microcode. This situation remains true even when one of the ACLs processing in the PSA microcode is removed and the total number of distinct ACLs drops to 16.
•Input ACL configuration on a subinterface is supported only on the 8-Port OC-3 STM-1 ATM line card.
•Only LLC/SNAP encapsulation is supported in the PSA microcode. VCMux or NLPID encapsulation is processed by the line card CPU.
•Basic IP and MPLS forwarding are supported together with input ACLs in the same 8-Port OC-3 STM-1 ATM line card microcode bundle. Any other features are either not supported, are processed by the line card CPU, or are processed in another PSA microcode bundle.
Related Features and Technologies
This feature allows you to configure input ACLs on a per-subinterface basis on the 8-Port OC-3 STM-1 ATM line card. For information on access control lists, see "Access Control Lists: Overview and Guidelines," a chapter in the Cisco IOS Release 12.0 Security Configuration Guide:
The following documents provide additional information about installing and configuring the 8-Port OC-3 STM-1 ATM line card:
•8-Port OC-3 STM-1 ATM Line Card Installation and Configuration
•Release Notes for Cisco 12000 Series Routers for Cisco IOS Release 12.0 S
•Release Notes for Cisco IOS Release 12.0 S
•Access Control Lists: Overview and Guidelines. This is a chapter in the Cisco IOS Release 12.0 Security Configuration Guide.
•Configuring IP Services. This is a chapter in the Cisco IOS Release 12.0 Network Protocols Configuration Guide, Part I. See the section "Filter IP Packets."
You can also find additional information in the installation and configuration guide for your Cisco 12000 Series Internet Router and in the Cisco IOS Release 12.0 documentation set.
This feature is supported on all Cisco 12000 series Internet Routers equipped with one or more 8-Port OC-3 STM-1 ATM line cards.
Determining Platform Support Through Cisco Feature Navigator
Cisco IOS software is packaged in feature sets that are supported on specific platforms. To get updated information regarding platform support for this feature, access Cisco Feature Navigator. Cisco Feature Navigator dynamically updates the list of supported platforms as new platform support is added for the feature.
Cisco Feature Navigator is a web-based tool that enables you to quickly determine which Cisco IOS software images support a specific set of features and which features are supported in a specific Cisco IOS image. You can search by feature or release. Under the release section, you can compare releases side by side to display both the features unique to each software release and the features in common.
To access Cisco Feature Navigator, you must have an account on Cisco.com. If you have forgotten or lost your account information, send a blank e-mail to email@example.com. An automatic check will verify that your e-mail address is registered with Cisco.com. If the check is successful, account details with a new random password will be e-mailed to you. Qualified users can establish an account on Cisco.com by following the directions found at this URL:
Cisco Feature Navigator is updated regularly when major Cisco IOS software releases and technology releases occur. For the most current information, go to the Cisco Feature Navigator home page at the following URL:
Availability of Cisco IOS Software Images
Platform support for particular Cisco IOS software releases is dependent on the availability of the software images for those platforms. Software images for some platforms may be deferred, delayed, or changed without prior notice. For updated information about platform support and availability of software images for each Cisco IOS software release, refer to the online release notes or, if supported, Cisco Feature Navigator.
Supported Standards, MIBs, and RFCs
•No new or modified standards apply to this feature.
•No new or modified MIBs apply to this feature.
•No new or modified RFCs apply to this feature.
The Cisco 12000 Series Internet Router must be equipped with an 8-Port OC-3 STM-1 ATM line card and must running Cisco IOS software Release 12.0(23)S or a later version of Cisco IOS software Release 12.0S.
See the following sections for configuration tasks for the 128-line input access control list (ACL) feature. Each task in the list is identified as either required or optional.
•Configuring Per-Subinterface Input ACLs (Required)
•Verifying Input ACL Configuration (Optional)
Configuring Per-Subinterface Input ACLs
To configure per-subinterface input ACLs on a 8-Port OC-3 STM-1 ATM line card, use the following command in subinterface configuration mode:
Router (config-subif)# ip access-group access-list-number in
Configures controlled access to an inbound subinterface on the 8-Port OC-3 STM-1 ATM line card.
Verifying Input ACL Configuration
To verify that the input ACL has been configured for an 8-Port OC-3 STM-1 ATM line card, use the following command in privileged EXEC mode:
Router# exec on slot slot show access-list psa summary
Displays the ACL state and additional details about the line card.
Monitoring Input ACL Status
To display the ACL state and additional information for an 8-Port OC-3 STM-1 ATM line card, use the following command in privileged EXEC mode:
Router# exec on slot slot show access-list psa summary
Displays the ACL state and additional details.
This example applies access list 101 on packets inbound to the specified ATM subinterface.interface atm 5/0.1ip access-group 101 in
This section documents modified commands associated with the use of this feature. All other commands used with this feature are documented in the Cisco IOS Release 12.0 command reference publications.
To control access to an interface or to a subinterface, use the ip access-group command in the appropriate configuration mode. To remove the specified access group, use the no form of this command.
ip access-group access-list-number in
no ip access-group access-list-number in
Number of an access list. This is a decimal number from 1 to 199 or from 1300 to 2699.
Filters on inbound packets.
No access list is applied.
This command was introduced.
This command was made available in subinterface configuration mode on the 8-Port OC-3 STM-1 ATM line card.
For the 8-Port OC-3 STM-1 ATM line card, access lists are applied on inbound interfaces only. For standard inbound access lists, after receiving a packet, the Cisco IOS software checks the source address of the packet against the access list. For extended access lists, the router also checks the destination access list. If the access list permits the address, the software continues to process the packet. If the access list rejects the address, the software discards the packet and returns an ICMP host unreachable message.
If the specified access list does not exist, all packets are passed.
The following example applies access list 101 on packets inbound to the specified ATM subinterface:interface atm 5/0.1ip access-group 101 in