AI2524 Router Card User’s Manual
Page 9-44 August 1997
2524UM
Use the IP DomainNa me System to Discover ISO CLNS Addresses
If your router has both ISO CLNS and I P en ab le d, you can use the
Domain Naming System (DNS) to que ry 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 add resses.
ip domain-lookup nsap
zDisable DNS queries for CLNS addre sses.
no ip domain-lookup nsap
Create Packet-Forwarding Filters and Establish Adjacencies
You can build powerful CLNS filter expressions, or access l ists. 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 addr ess 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 th rou gh the u se of wildcard
characters, prefixes, and suffixes. Frequently used address templates
can be given aliases for easier refe r ence.
1. In global configuration mode, es tablish CLNS filters:
zCreate aliases for frequently use d address templates.
clns template-alias

name 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-expr

ename term