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FTOS Configuration Guide for the C-Series - Force10 Networks

FTOS Configuration Guide for the C-Series - Force10 Networks

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Step Command Syntax Command Mode Purpose<br />

5<br />

neighbor {ip-address |<br />

peer-group-name} filter-list<br />

as-path-name {in | out}<br />

Use <strong>the</strong> show config command in CONFIGURATION ROUTER BGP mode and show ip<br />

as-path-access-list command in EXEC Privilege mode to view which commands are configured.<br />

Include this filter permit .* in your AS-PATH ACL to <strong>for</strong>ward all routes not meeting <strong>the</strong> AS-PATH ACL<br />

criteria.<br />

Configure BGP route reflectors<br />

CONFIG-ROUTER-<br />

BGP<br />

BGP route reflectors are intended <strong>for</strong> Autonomous Systems with a large mesh and <strong>the</strong>y reduce <strong>the</strong> amount<br />

of BGP control traffic. With route reflection configured properly, IBGP routers are not fully meshed within<br />

a cluster but all receive routing in<strong>for</strong>mation.<br />

Configure clusters of routers where one router is a concentration router and o<strong>the</strong>rs are clients who receive<br />

<strong>the</strong>ir updates from <strong>the</strong> concentration router.<br />

Use <strong>the</strong> following commands in <strong>the</strong> CONFIGURATION ROUTER BGP mode to configure a route<br />

reflector.<br />

Command Syntax Command Mode Purpose<br />

bgp cluster-id cluster-id CONFIG-ROUTER-<br />

BGP<br />

neighbor {ip-address |<br />

peer-group-name}<br />

route-reflector-client<br />

CONFIG-ROUTER-<br />

BGP<br />

Filter routes based on <strong>the</strong> criteria in <strong>the</strong><br />

configured route map. Configure <strong>the</strong><br />

following parameters:<br />

• ip-address or peer-group-name: enter<br />

<strong>the</strong> neighbor’s IP address or <strong>the</strong> peer<br />

group’s name.<br />

• as-path-name: enter <strong>the</strong> name of a<br />

configured AS-PATH ACL.<br />

• in: apply <strong>the</strong> AS-PATH ACL map to<br />

inbound routes.<br />

• out: apply <strong>the</strong> AS-PATH ACL to<br />

outbound routes.<br />

Assign an ID to a router reflector cluster.<br />

You can have multiple clusters in an AS.<br />

Configure <strong>the</strong> local router as a route reflector and<br />

<strong>the</strong> neighbor or peer group identified is <strong>the</strong> route<br />

reflector client.<br />

To view a route reflector configuration, use <strong>the</strong> show config command in <strong>the</strong> CONFIGURATION<br />

ROUTER BGP mode or show running-config bgp in EXEC Privilege mode.<br />

When you enable a route reflector, <strong>FTOS</strong> automatically enables route reflection to all clients. To disable<br />

route reflection between all clients in this reflector, use <strong>the</strong> no bgp client-to-client reflection command<br />

in CONFIGURATION ROUTER BGP mode. All clients should be fully meshed be<strong>for</strong>e you disable route<br />

reflection.<br />

506 Border Gateway Protocol (BGP)

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