Re: BGP question
- From: Barry Margolin <barmar@xxxxxxxxxxxx>
- Date: Fri, 30 Dec 2005 18:01:04 -0500
In article <1NidnQQVlqpRXineRVn-qQ@xxxxxxxxxxx>,
"supernet" <supernet@xxxxxxxxxxx> 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?
It gets them from router1, via iBGP. By default, BGP doesn't change the
next-hop when passing routes in iBGP. Router2 should learn the route to
ISP1 Router through your IGP, so you shouldn't lose connectivity because
of this. If there's some reason why this route can't be passed in your
IGP, you should configure the iBGP neighbor sessions with the
"next-hop-self" option.
--
Barry Margolin, barmar@xxxxxxxxxxxx
Arlington, MA
*** PLEASE post questions in newsgroups, not directly to me ***
*** PLEASE don't copy me on replies, I'll read them in the group ***
.
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