From: Stephen C. Feldberg (scfeldberg@xxxxxxxxxxx)
Date: Thu Dec 13 2001 - 16:31:56 GMT-3
Peer's network address must be in routing table for BGP TCP session to be
established. Default routes will not get it done.
Steve
----- Original Message -----
From: "Krake, Kris" <KKrake@aegonusa.com>
To: <ccielab@groupstudy.com>
Cc: "Krake, Kris" <KKrake@aegonusa.com>
Sent: Thursday, December 13, 2001 1:35 PM
Subject: bgp peering
> I am working with two routers and setting up BGP peering between them and
> found something interesting regarding static routes. I am wondering if I
> have something misconfigured or if Both routers are peering with
loopback
> 0 interface.
>
> Loop0 10.10.1.1/32 Loop0 10.20.1.1/32
> I I
> I I
> I I
> Router A ---------------BGP------------RouterB
>
>
> Router A and Router B both have default static routes to each other.
> =-=-=-=-=-=-=-=
> Router A
>
> int loopback 0
> ip address 10.10.1.1 255.255.255.255
>
> Int s0
> ip address 192.168.1.1 255.255.255.252
>
> Router BGP 1
> neighbor 10.20.1.1 remote-as 1
> neighbor 10.20.1.1 update-source loopback 0
>
> Ip route 0.0.0.0 0.0.0.0 192.168.1.2
>
> =-=-=-=-=-=-=-=-=-
> Router B
>
> int looback 0
> ip address 10.20.1.1 255.255.255.255
>
> Int s0
> ip address 192.168.1.2 255.255.255.252
>
> Router BGP 1
> neighbor 10.10.1.1 remote-as 1
> neighbor 10.10.1.1 update-sourch loopback 0
>
> ip route 0.0.0.0 0.0.0.0 192.168.1.1
>
> =-=-=-=-=-=-=-=
>
> Here's the kicker...I can ping from one loopback to the other no problems.
> Verified with an extended ping. But I cannot establish a TCP connection
> between the two routers unless I add a static route to one of the
loopbacks
> from the other router...which router makes no difference... (eg.)
>
> Router A
> ip route 10.20.1.1 255.255.255.255 192.168.1.2
>
> or (not and !!!)
>
> Router B
> ip route 10.10.1.1 255.255.255.255 192.168.1.1
>
> Anyone seen this...I can't find any documentation that would say this is
> necessary. Router A is running 12.0(7) and Router B is running 12.1(5)T7
>
> Thanks for any input....
>
> KK
>
>
>
>
>
>
> =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
> Kris A. Krake
> WAN Engineer
> AEGON Technology Services - NECS
> 502.560.2716
> kkrake@aegonusa.com
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