Chapter 50
| IP Routing Commands
Policy-based Routing for BGP
– 1137 –
route-map This command enters route-map configuration mode, allowing route maps to be
created or modified. Use the no form to remove a route map.
Syntax
[no] route-map map-name {deny | permit} sequence-number
map-name – Name for the route map. (Range: 1-128 case-sensitive
alphanumeric characters)
deny – Route-map denies set operations.
permit – Route-map permits set operations.
sequence-number – Sequence to insert to or delete from existing route-map
entry. (Range: 1-65535)
Command Mode
Global Configuration
Default Setting
Disabled
Command Usage
◆ This command enters the route map configuration mode. In this mode, a new
route map can be created, or an existing route map modified.
◆ The match commands specify the conditions under which policy routing
occurs, and the set commands specify the routing actions to perform if the
criteria enforced by the match commands are met.
◆ If the match criteria are met for a route map, and the permit keyword specified,
the packet is policy routed based on defined set commands.
◆ If the match criteria are not met, and the permit keyword specified, the next
route map with the same map-name is tested. If a route passes none of the
match criteria for the set of route maps sharing the same name, it is not policy
routed by that set.
◆ If the match criteria are met for the route map and the deny keyword specified,
the packet is not policy routed, and no further route maps sharing the same
map-name are examined. If the packet is not policy routed, the normal
forwarding process is used.
◆ Processing for exceptions include the following results:
■
For a deny route-map, if it does not have a match clause, any routing
message is matched, and therefore all routes are denied.
■
For a deny route-map which includes a match clause for an access-list, if the
access-list does not exist, no routing message will be matched, and
therefore all routes are skipped.
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