Re: [isp-bgp] BGP AS path

[vdadlaney@...]

Hi Robert,

Thx for correcting me on that. It would be interesting to find out if anyone is actually using this in the real world? Thx 

Regards,

Vikram


> 
>  > I don't think this feature is available in normal BGP v4
>  > Please correct me if I am wrong. Thx
> 
> Yes you are wrong.
> 
> router bgp 200
>   no synchronization
>   bgp log-neighbor-changes
>   timers bgp 10 30
>   redistribute connected
>   redistribute ospf 200 match internal external 1 external 2
>   neighbor 21.20.1.3 remote-as 100
>   neighbor 21.20.1.3 advertisement-interval 5
>   neighbor 21.20.1.3 allowas-in 4
>   no auto-summary
> 
> R1#sh ip bgp summ
> BGP router identifier 20.50.50.1, local AS number 200
>                                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> BGP table version is 14, main routing table version 14
> 7 network entries using 791 bytes of memory
> 7 path entries using 364 bytes of memory
> 3/2 BGP path/bestpath attribute entries using 396 bytes of memory
> 1 BGP AS-PATH entries using 24 bytes of memory
> 0 BGP route-map cache entries using 0 bytes of memory
> 0 BGP filter-list cache entries using 0 bytes of memory
> BGP using 1575 total bytes of memory
> BGP activity 10/3 prefixes, 10/3 paths, scan interval 60 secs
> 
> Neighbor        V    AS MsgRcvd MsgSent   TblVer  InQ OutQ Up/Down 
> State/PfxRcd
> 21.20.1.3       4   100      37      38       14    0    0 00:00:33        3
> 
> R1#sh ip bgp
> BGP table version is 14, local router ID is 20.50.50.1
> Status codes: s suppressed, d damped, h history, * valid, > best, i - 
> internal,
>                r RIB-failure, S Stale
> Origin codes: i - IGP, e - EGP, ? - incomplete
> 
>     Network          Next Hop            Metric LocPrf Weight Path
> *> 20.1.1.1/32      0.0.0.0                  0         32768 ?
> *> 20.9.9.9/32      21.20.1.3                              0 100 200 ?
>                                                                   ^^^^^
> *> 20.50.50.1/32    0.0.0.0                  0         32768 ?
> *> 20.51.51.1/32    21.20.1.3                              0 100 200 ?
>                                                                   ^^^^^
> *> 21.20.1.0/24     0.0.0.0                  0         32768 ?
> *> 21.20.11.0/24    0.0.0.0                  0         32768 ?
> *> 29.20.9.0/24     21.20.1.3                              0 100 200 ?
>                                                                   ^^^^^
> 
> Tested with the latest conn_isp 120S image 120(31.1)S1 :).
> 
> 
> Cheers,
> R.
> 
> PS. It is true that it was originally delivered for hub & spoke l3vpns. 
> It's use just spreaded though :).





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