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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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Command Syntax Command Mode Purpose<br />

neighbor {ip-address |<br />

peer-group-name} graceful-restart<br />

[stale-path-time time-in-seconds]<br />

Filter on an AS-Path attribute<br />

CONFIG-ROUTER-<br />

BGP<br />

The BGP attribute, AS_PATH, can be used to manipulate routing policies. The AS_PATH attribute<br />

contains a sequence of AS numbers representing <strong>the</strong> route’s path. As <strong>the</strong> route traverses an Autonomous<br />

System, <strong>the</strong> AS number is prepended to <strong>the</strong> route. You can manipulate routes based on <strong>the</strong>ir AS_PATH to<br />

affect interdomain routing. By identifying certain AS numbers in <strong>the</strong> AS_PATH, you can permit or deny<br />

routes based on <strong>the</strong> number in its AS_PATH.<br />

To view all BGP path attributes in <strong>the</strong> BGP database, use <strong>the</strong> show ip bgp paths command in EXEC<br />

Privilege mode (Figure 355).<br />

Figure 355 Command example: show ip bgp paths<br />

<strong>Force10</strong>#show ip bgp paths<br />

Total 30655 Paths<br />

Address Hash Refcount Metric Path<br />

0x4014154 0 3 18508 701 3549 19421 i<br />

0x4013914 0 3 18508 701 7018 14990 i<br />

0x5166d6c 0 3 18508 209 4637 1221 9249 9249 i<br />

0x5e62df4 0 2 18508 701 17302 i<br />

0x3a1814c 0 26 18508 209 22291 i<br />

0x567ea9c 0 75 18508 209 3356 2529 i<br />

0x6cc1294 0 2 18508 209 1239 19265 i<br />

0x6cc18d4 0 1 18508 701 2914 4713 17935 i<br />

0x5982e44 0 162 18508 209 i<br />

0x67d4a14 0 2 18508 701 19878 ?<br />

0x559972c 0 31 18508 209 18756 i<br />

0x59cd3b4 0 2 18508 209 7018 15227 i<br />

0x7128114 0 10 18508 209 3356 13845 i<br />

0x536a914 0 3 18508 209 701 6347 7781 i<br />

0x2ffe884 0 1 18508 701 3561 9116 21350 i<br />

0x2ff7284 0 99 18508 701 1239 577 855 ?<br />

0x2ff7ec4 0 4 18508 209 3561 4755 17426 i<br />

0x2ff8544 0 3 18508 701 5743 2648 i<br />

0x736c144 0 1 18508 701 209 568 721 1494 i<br />

0x3b8d224 0 10 18508 209 701 2019 i<br />

0x5eb1e44 0 1 18508 701 8584 16158 i<br />

0x5cd891c 0 9 18508 209 6453 4759 i<br />

--More--<br />

Set maximum time to retain <strong>the</strong> restarting<br />

neighbor’s or peer-group’s stale paths. Default<br />

is 360 seconds.<br />

AS-PATH ACLs use regular expressions to search AS_PATH values. AS-PATH ACLs have an “implicit<br />

deny.” This means that routes that do not meet a deny or match filter are dropped.<br />

492 Border Gateway Protocol (BGP)

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