Reference Guide

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.
To view which commands are configured, use the show config command in CONFIGURATION
ROUTER BGP mode and the show ip as-path-access-list command in EXEC Privilege mode.
To forward all routes not meeting the AS-PATH ACL criteria, include the permit .* filter in your AS-PATH
ACL.
Configuring BGP Route Reflectors
BGP route reflectors are intended for ASs with a large mesh; 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 the others are clients who
receive their updates from the concentration router.
To configure a route reflector, use the following commands.
• Assign an ID to a router reflector cluster.
CONFIG-ROUTER-BGP mode
bgp cluster-id cluster-id
You can have multiple clusters in an AS.
• Configure the local router as a route reflector and the neighbor or peer group identified is the route
reflector client.
CONFIG-ROUTER-BGP mode
neighbor {ip-address | peer-group-name} route-reflector-client
When you enable a route reflector, Dell Networking OS 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 must be fully
meshed before you disable route reflection.
To view a route reflector configuration, use the show config command in CONFIGURATION ROUTER
BGP mode or the show running-config bgp in EXEC Privilege mode.
Aggregating Routes
Dell Networking OS provides multiple ways to aggregate routes in the BGP routing table. At least one
specific route of the aggregate must be in the routing table for the configured aggregate to become
active.
To aggregate routes, use the following command.
AS_SET includes AS_PATH and community information from the routes included in the aggregated route.
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Border Gateway Protocol IPv4 (BGPv4)