i have some question about EBGP in same broadcast ??

[hatman]

I have some question about EBGP in same broadcast ??

I have 3 router each router separate as-number but ip address for peer bgp is same subnet.

For example

router a - as1 192.168.1.1

router b - as2 192.168.1.2

router c - as3 192.168.1.3

router a (as1)(192.168.1.1) peer ebgp with router b (as2)(192.168.1.2)

router a advertise prefix 2.2.2.2/32

router b

sh ip bgp ==>

2.2.2.2/32                  192.168.1.1                   1 i

----

router b (as2)(192.168.1.2)  peer ebgp with router c (as3)(192.168.1.3)

router c

sh ip bgp ==>

2.2.2.2/32               192.168.1.1               1 i

--- Is not see as-path 2 in the as-path ?? What the function can do it ?

[Ronit Bhattacharjee]

Hi,

Attach "show run", "show ip bgp summary" and "show ip bgp" from all 3 routers.

[hatman]

i can show only on router C

sh ip bgp  216.12.197.106

Tue Nov  1 17:04:58.794 THBKK

BGP routing table entry for 216.12.192.0/19

Versions:

  Process           bRIB/RIB  SendTblVer

  Speaker          411219401   411219401

Last Modified: Oct  8 17:49:49.248 for 1y03w

Paths: (5 available, best #2)

  Advertised to update-groups (with more than one peer):

    0.2

  Path #1: Received by speaker 0

  3491 6453 36351

    63.218.229.149 from 63.218.229.149 (63.218.164.10)

      Origin IGP, localpref 100, valid, external

      Community: 3491:4000 3491:4012 3491:6453 6453:3000 6453:3400 6453:3402 65009:4637

  Path #2: Received by speaker 0

  36351

    202.79.197.69 from 202.79.197.122 (202.79.197.122)

      Origin IGP, metric 0, localpref 500, valid, external, best

      Community: 24115:36351 24115:65220 36351:31 36351:34 45629:1000 45629:9989 65518:30 65518:3301

best path is Path#2

via next-hop is 202.79.197.69

via bgp session is 202.79.197.122

and neighbor 202.79.197.122 is not as 36351

am sorry for can't show full config.

thank.

[Ronit Bhattacharjee · Accepted solution]

The outputs you sent are not consistent with the diagram you showed earlier.

Disregarding the diagram and focussing on the outputs you sent, what AS do you expect to see that you don't see? Is the neighbor (Router B) acting as a route reflector or a route server? A router configured as a rotue server will suppress its own AS

http://www.cisco.com/en/US/docs/ios/ios_xe/iproute_bgp/configuration/guide/irg_route_server_xe.html

Without the neighbor's config or this router's config, it is difficult to say what is wrong

[hatman]

route-server

i think is correct because the middle router act as tranparent don't change as-path , next-hop.

thank you very much.