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FTOS Configuration Guide for the C-Series - Force10 Networks

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FTOS Configuration Guide for the C-Series - Force10 Networks

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Use <strong>the</strong> show ip bgp community command in EXEC Privilege mode (Figure 358) to view BGP routes<br />

matching a certain community number or pre-defined BGP community.<br />

Figure 358 Command example: show ip bgp community (Partial)<br />

<strong>Force10</strong>>show ip bgp community<br />

BGP table version is 3762622, local router ID is 10.114.8.48<br />

Status codes: s suppressed, d damped, h history, * valid, > best, i - internal<br />

Origin codes: i - IGP, e - EGP, ? - incomplete<br />

Network Next Hop Metric LocPrf Weight Path<br />

* i 3.0.0.0/8 195.171.0.16 100 0 209 701 80 i<br />

*>i 4.2.49.12/30 195.171.0.16 100 0 209 i<br />

* i 4.21.132.0/23 195.171.0.16 100 0 209 6461 16422 i<br />

*>i 4.24.118.16/30 195.171.0.16 100 0 209 i<br />

*>i 4.24.145.0/30 195.171.0.16 100 0 209 i<br />

*>i 4.24.187.12/30 195.171.0.16 100 0 209 i<br />

*>i 4.24.202.0/30 195.171.0.16 100 0 209 i<br />

*>i 4.25.88.0/30 195.171.0.16 100 0 209 3561 3908 i<br />

*>i 6.1.0.0/16 195.171.0.16 100 0 209 7170 1455 i<br />

*>i 6.2.0.0/22 195.171.0.16 100 0 209 7170 1455 i<br />

*>i 6.3.0.0/18 195.171.0.16 100 0 209 7170 1455 i<br />

*>i 6.4.0.0/16 195.171.0.16 100 0 209 7170 1455 i<br />

*>i 6.5.0.0/19 195.171.0.16 100 0 209 7170 1455 i<br />

*>i 6.8.0.0/20 195.171.0.16 100 0 209 7170 1455 i<br />

*>i 6.9.0.0/20 195.171.0.16 100 0 209 7170 1455 i<br />

*>i 6.10.0.0/15 195.171.0.16 100 0 209 7170 1455 i<br />

Change MED attribute<br />

By default, <strong>FTOS</strong> uses <strong>the</strong> MULTI_EXIT_DISC or MED attribute when comparing EBGP paths from <strong>the</strong><br />

same AS.<br />

Use any or all of <strong>the</strong> following commands in <strong>the</strong> CONFIGURATION ROUTER BGP mode to change how<br />

<strong>the</strong> MED attribute is used.<br />

Command Syntax Command Mode Purpose<br />

bgp always-compare-med CONFIG-ROUTER-<br />

BGP<br />

bgp bestpath med {confed |<br />

missing-as-best}<br />

CONFIG-ROUTER-<br />

BGP<br />

Enable MED comparison in <strong>the</strong> paths from<br />

neighbors with different ASs.<br />

By default, this comparison is not per<strong>for</strong>med.<br />

Change <strong>the</strong> bestpath MED selection to one of <strong>the</strong><br />

following:<br />

confed: Chooses <strong>the</strong> bestpath MED comparison<br />

of paths learned from BGP confederations.<br />

missing-as-best: Treat a path missing an MED<br />

as <strong>the</strong> most preferred one<br />

Use <strong>the</strong> show config command in <strong>the</strong> CONFIGURATION ROUTER BGP mode to view <strong>the</strong> nondefault<br />

values.<br />

500 Border Gateway Protocol (BGP)

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