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Configuring IS-IS Configuring IS-IS
page 3-24 OmniSwitch 6800/6850/9000 Advanced Routing Configuration Guide December 2007
Configuring Redistribution Using Route Maps
It is possible to configure the IS-IS protocol to advertise routes learned from other routing protocols (AS-
external routes) into the IS-IS network. Such a process is referred to as route redistribution and is config-
ured using the ip redist command.
IS-IS redistribution uses route maps to control how external routes are learned and distributed. A route
map consists of one or more user-defined statements that can determine which routes are allowed or
denied access to the IS-IS network. In addition a route map may also contain statements that modify route
parameters before they are redistributed.
When a route map is created, it is given a name to identify the group of statements that it represents. This
name is required by the ip redist command. Therefore, configuring IS-IS route redistribution involves the
following steps:
1 Create a route map, as described in “Using Route Maps” on page 3-24.
2 Configure redistribution to apply a route map, as described in “Configuring Route Map Redistribu-
tion” on page 3-28.
Using Route Maps
A route map specifies the criteria that are used to control redistribution of routes between protocols. Such
criteria are defined by configuring route map statements. There are three different types of statements:
• Action—An action statement configures the route map name, sequence number, and whether or not
redistribution is permitted or denied based on route map criteria.
• Match—A match statement specifies criteria that a route must match. When a match occurs, then the
action statement is applied to the route.
• Set—A set statement is used to modify route information before the route is redistributed into the
receiving protocol. This statement is applied only if all the criteria of the route map is met and the
action permits redistribution.
The ip route-map command is used to configure route map statements and provides the following action,
match, and set parameters:
Note. The tag parameter is not supported in the current release.
ip route-map action ... ip route-map match ... ip route-map set ...
permit
deny
ip address
ip next-hop
ipv6 address
ipv6 next-hop
tag
ipv4-interface
ipv6-interface
metric
route-type
metric
metric-type
tag
community
local-preference
level
ip-nexthop
ipv6-nexthop