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Border Gateway Protocol IPv4 (BGPv4) | 257
Use the show config command in CONFIGURATION ROUTER BGP mode and show ip
as-path-access-list
command in EXEC Privilege mode to view which commands are configured.
Include this filter
permit .* in your AS-PATH ACL to forward all routes not meeting the AS-PATH ACL
criteria.
Configure BGP route reflectors
BGP route reflectors are intended for Autonomous Systems with a large mesh and they reduce the amount
of BGP control traffic. With route reflection configured properly, IBGP routers are not fully meshed within
a cluster but all receive routing information.
Configure clusters of routers where one router is a concentration router and others are clients who receive
their updates from the concentration router.
Use the following commands in the CONFIGURATION ROUTER BGP mode to configure a route
reflector.
To view a route reflector configuration, use the
show config command in the CONFIGURATION
ROUTER BGP mode or
show running-config bgp in EXEC Privilege mode.
When you enable a route reflector, FTOS automatically enables route reflection to all clients. To disable
route reflection between all clients in this reflector, use the
no bgp client-to-client reflection command in
CONFIGURATION ROUTER BGP mode. All clients should be fully meshed before you disable route
reflection.
5
neighbor {ip-address |
peer-group-name} filter-list
as-path-name {in | out}
CONFIG-ROUTER-B
GP
Filter routes based on the criteria in the
configured route map. Configure the following
parameters:
• ip-address or peer-group-name: enter the
neighbor’s IP address or the peer group’s
name.
•
as-path-name: enter the name of a
configured AS-PATH ACL.
•
in: apply the AS-PATH ACL map to
inbound routes.
• out: apply the AS-PATH ACL to outbound
routes.
Command Syntax Command Mode Purpose
bgp cluster-id cluster-id CONFIG-ROUTER-
BGP
Assign an ID to a router reflector cluster.
You can have multiple clusters in an AS.
neighbor {ip-address |
peer-group-name}
route-reflector-client
CONFIG-ROUTER-
BGP
Configure the local router to function as the route
reflector and a specified neighbor or peer group to be
the route-reflector clients in the cluster.
Step Command Syntax Command Mode Purpose