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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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Manipulate <strong>the</strong> COMMUNITY attribute<br />

In addition to permitting or denying routes based on <strong>the</strong> values of <strong>the</strong> COMMUNITY attributes, you can<br />

manipulate <strong>the</strong> COMMUNITY attribute value and send <strong>the</strong> COMMUNITY attribute with <strong>the</strong> route<br />

in<strong>for</strong>mation.<br />

By default, <strong>FTOS</strong> does not send <strong>the</strong> COMMUNITY attribute.<br />

Use <strong>the</strong> following command in <strong>the</strong> CONFIGURATION ROUTER BGP mode to send <strong>the</strong> COMMUNITY<br />

attribute to BGP neighbors.<br />

Command Syntax Command Mode Purpose<br />

neighbor {ip-address |<br />

peer-group-name} send-community<br />

CONFIG-ROUTER-<br />

BGP<br />

To view <strong>the</strong> BGP configuration, use <strong>the</strong> show config command in <strong>the</strong> CONFIGURATION ROUTER<br />

BGP mode.<br />

If you want to remove or add a specific COMMUNITY number from a BGP path, you must create a route<br />

map with one or both of <strong>the</strong> following statements in <strong>the</strong> route map. Then apply that route map to a BGP<br />

neighbor or peer group. Use <strong>the</strong>se commands in <strong>the</strong> following sequence, starting in <strong>the</strong><br />

CONFIGURATION mode:<br />

Step Command Syntax Command Mode Purpose<br />

1 route-map map-name<br />

[permit | deny]<br />

[sequence-number]<br />

Enable <strong>the</strong> software to send <strong>the</strong> router’s<br />

COMMUNITY attribute to <strong>the</strong> BGP neighbor or<br />

peer group specified.<br />

CONFIGURATION Enter <strong>the</strong> ROUTE-MAP mode and assign a<br />

name to a route map.<br />

498 Border Gateway Protocol (BGP)

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