AIS AI2524 user manual Create Packet-Forwarding Filters and Establish Adjacencies

AI2524 Router Card User’s Manual

Use the IP DomainNa me System to Discover ISO CLNS

Addresses

If your router has both ISO CLNS and IP enabled, you can use the Domain Naming System (DNS) to query ISO CLNS addresses by using the NSAP address type, as documented in RFC 1348. This fea- ture is useful for the ISO CLNS ping EXEC command and when making Telnet connections. This feature is enabled by default.

In global configuration mode, enable or disable DNS queries for IS

CLNS addresses:

zEnable DNS queries for CLNS addresses. ip domain-lookup nsap

zDisable DNS queries for CLNS addresses. no ip domain-lookup nsap

Create Packet-Forwarding Filters and Establish

Adjacencies

You can build powerful CLNS filter expressions, or access lists. These can be used to control either the forwarding of frames through route interfaces, or the establishment of adjacencies with, or the application of filters to, any combination of ES or IS neighbors, ISO IGRP neigh- bors, or IS-IS neighbors.

CLNS filter expressions are complex logical combinations of CLNS filter sets. CLNS filter sets are lists of address templates against which CLNS addresses are matched. Address templates are CLNS address patterns that are either simple CLNS addresses that match just one ad- dress, or match multiple CLNS addresses through the use of wildcard characters, prefixes, and suffixes. Frequently used address templates can be given aliases for easier reference.

1. In global configuration mode, establish CLNS filters:

zCreate aliases for frequently used address templates. clns template-aliasname template

zBuild filter sets of multiple address template permit and deny con- ditions.

clns filter-set sname [permit deny] template

zBuild filter expressions, using one or more filter sets. clns filter-exprename term

Page 9-44	August 1997
	2524UM