From: Maneesh Chawla (coolmaneesh@gmail.com)
Date: Fri Dec 30 2005 - 02:48:40 GMT-3
What I understand is , router 1 and router 2 are EBGP and you are setting
the next-hop using the route-map(I dont see a config showing peering between
router1 and router2 unless you have also used the local-as option and you
have not included it here). Both router get the whole internet feed from the
respective ISPs. It may so happen that 203.34.233.0/24 when advertised from
ISP 2 to router 2 mite get blocked/flapped somewhere upstream from where ISP
2 receives the route and in that case router 2 may take the path through
ISP1 to reach the same route. That is the reason it shows the next hop as
ISP1.
Please correct me if am wrong.
Thanks
Maneesh
On 12/30/05, supernet <supernet@comcast.net> wrote:
>
> I have 2 routers connect to 2 ISPs:
>
> ISP1 router--------My router1------My router2---------ISP2 router
>
>
>
> My router1 configuration:
>
> router bgp 11111
>
> no synchronization
>
> no bgp log-neighbor-changes
>
> network 17.11.0.0
>
> neighbor 69.231.141.153 remote-as 12345
>
> neighbor 17.11.25.11 remote-as 11111
>
> no auto-summary
>
>
>
> My router2 configuration:
>
> router bgp 22222
>
> no synchronization
>
> no bgp log-neighbor-changes
>
> network 17.11.0.0
>
> neighbor 167.13.192.145 remote-as 54321
>
> neighbor 17.11.25.12 remote-as 22222
>
> no auto-summary
>
>
>
> I noticed my router2 routing table keeps changing and caused connectivity
> problems. It sometimes gets routes from ISP1 router. How does it happen?
> My
> router2 does not have direct session with ISP1 router. Anyone can help me?
>
>
>
> Here is part of the routing table on my router2:
>
> B 217.170.115.0/24 [20/0] via 167.13.192.145, 2w1d
>
> B 216.221.5.0/24 [20/0] via 167.13.192.145, 1w1d
>
> B 210.51.225.0/24 [20/0] via 167.13.192.145, 2w1d
>
> B 209.136.89.0/24 [20/0] via 167.13.192.145, 2w1d
>
> B 209.34.243.0/24 [20/0] via 167.13.192.145, 2w1d
>
> B 205.204.1.0/24 [20/0] via 167.13.192.145, 6d23h
>
> B 204.255.51.0/24 [20/0] via 167.13.192.145, 2w1d
>
> B 204.238.34.0/24 [20/0] via 167.13.192.145, 2d14h
>
> B 204.221.17.0/24 [20/0] via 167.13.192.145, 2w1d
>
> B 204.17.221.0/24 [20/0] via 167.13.192.145, 2w1d
>
> B 203.238.37.0/24 [20/0] via 167.13.192.145, 2w1d
>
> B 203.34.233.0/24 [200/0] via 69.231.141.154, 00:00:43 (why this???)
>
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