From: Krake, Kris (KKrake@xxxxxxxxxxxx)
Date: Thu Dec 13 2001 - 15:35:23 GMT-3
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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