23456 without AS4_PATH?
Emanuel Petr
emanuel.petr at nic.cz
Mon Mar 2 11:44:42 UTC 2009
Saku Ytti wrote:
> On (2009-02-28 18:05 +0100), sthaug at nethelp.no wrote:
>
>>> show route 195.128.231.0/24 detail
>>> [..omitted..]
>>> AS path: AS2 PA[5]: 39792 35320 AS_TRANS AS_TRANS 35748
>>> AS path: AS4 PA[4]: 35320 3.21 AS_TRANS 35748
>>> AS path: Merged[5]: 39792 35320 3.21 AS_TRANS 35748 I
>>> [...omitted...]
>> Agreed, that sounds wrong. However, that's not how the route appears
>> from here:
>>
>> show route 195.128.231.0/24 detail | match "AS path: [0-9AM]"
>> AS path: AS2 PA[5]: 3356 13249 6886 AS_TRANS 35748
>> AS path: AS4 PA[4]: 13249 6886 196629 35748
>> AS path: Merged[5]: 3356 13249 6886 196629 35748 I
>> AS path: AS2 PA[6]: 1299 3356 13249 6886 AS_TRANS 35748
>> AS path: AS4 PA[4]: 13249 6886 196629 35748
>> AS path: Merged[6]: 1299 3356 13249 6886 196629 35748 I
>>
>> So in our case the AS4 path seems normal.
>
> Looks OK in cisco as-dot format too, so unlike first example, I think
> this may be local problem.
>
> gw.ip.fi#show ip bgp 195.128.231.0/24
> BGP routing table entry for 195.128.231.0/24, version 29
> Paths: (1 available, best #1, table Default-IP-Routing-Table)
> Multipath: eBGP
> Not advertised to any peer
> 3292 3356 13249 6886 3.21 35748, (received & used)
> 62.237.167.25 from 62.237.167.25 (62.236.0.5)
> Origin IGP, localpref 100, valid, external, best
> Community: 3292:1101 3292:1901
> gw.ip.fi#
>
>
We have same result, like the first example from Steinar Haug.
> show route 195.128.231.0/24 detail | match "AS path"
AS path: AS2 PA[6]: 15685 29208 35320 AS_TRANS AS_TRANS
35748
AS path: AS4 PA[4]: 35320 196629 AS_TRANS 35748
AS path: Merged[6]: 15685 29208 35320 196629 AS_TRANS
35748 I
...
AS path: AS2 PA[7]: 9002 13249 13249 13249 6886
AS_TRANS 35748
AS path: AS4 PA[6]: 13249 13249 13249 6886 196629 35748
AS path: Merged[7]: 9002 13249 13249 13249 6886 196629
35748 I
Note: If propagated via AS196629,AS35320,.... then the AS4_PATH contains
AS_TRANS.
Em.
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