[c-nsp] possible CEF issue?

[jc hall]

Hello list.  I've been watching the posts for some time now and have
read a lot of useful information.  There are some very knowledgeable
professionals who contribute here.  This is my first post, sorry it is
lengthy.

 

However, I have an issue I would like somebody's professional opinion
on.

 

I have two 7206VXR Routers w/NPE-400s connected via FastEthernet.  The
configuration is as follows:

 

[Router1]

interface Loopback0

 ip address x.x.149.252 255.255.255.255

!

interface FastEthernet1/0

 description Connection to Router2 FastEthernet1/1

 ip address x.x.149.29 255.255.255.252

 

[Router2]

interface Loopback0

 ip address x.x.149.251 255.255.255.255

!

interface FastEthernet1/1

 description Connection to Router1 FastEthernet1/0

 ip address x.x.149.30 255.255.255.252

 

Both routers run IOS 12.2(17a), CEF, EIGRP and an iBGP peer.  From each
router, I can successfully ping the attached interface of the other.
>From Router1 however, I can not ping the Loopback interface of Router2.
>From Router2, I can successfully ping the Loopback of Router1.  PINGS
from Router1 to the Loopback interface of Router2 receive a response
from an IP address attached to a different interface
(FastEthernet0/0.500) on Router1.

 

For example:

 

Router1#ping x.x.149.251       

 

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to x.x.149.251, timeout is 2 seconds:

 

Reply to request 0 from host.domain-name.com (x.x.142.10), 1 ms

Reply to request 1 from host.domain-name.com (x.x.142.10), 1 ms

 

Originally, the iBGP peer between these two routers used these Loopback
interfaces as the update-source.  When I took these routers on, it was
not working.  I added a new Loopback with a new IP address on Router2
and changed the update-source on the two routers to band-aid the
problem.

 

In my initial troubleshooting, the Loopback IP Addresses were known
correctly via the routing protocol from both router's perspectives.
However, from Router1's perspective, the CEF entry was not correct in
fact, there was not much output.  It looked as if you were to do a "show
ip cef 0.0.0.0"  Unfortunately, a "show ip cef x.x.149.251" appears
normal now so I can't provide an example.  

 

The problem with the CEF entry was my initial thought although it looks
normal now.  The problem still exists, that the Loopback interfaces
can't reach each other.  Does anybody have any ideas?

 

Thanks

 

/JC

 

 

Additional Output

 

Router1#show ip cef x.x.149.251

x.x.149.251/32, version 45468681, per-destination sharing

925231 packets, 81667986 bytes

  Flow: AS 0, mask 32

  via x.x.149.30, FastEthernet1/0, 0 dependencies

    next hop x.x.149.30, FastEthernet1/0

    valid adjacency

  925231 packets, 81667986 bytes switched through the prefix

  tmstats: external 0 packets, 0 bytes

           internal 925231 packets, 81667986 bytes

  30 second output rate 0 Kbits/sec 

Router1# 

 

Router2#show ip cef x.x.149.252

x.x.149.252/32, version 19140878, per-destination sharing

0 packets, 0 bytes

  Flow: AS 0, mask 32

  via x.x.149.29, FastEthernet1/1, 0 dependencies

    next hop x.x.149.29, FastEthernet1/1

    valid adjacency

  0 packets, 0 bytes switched through the prefix  <--this doesn't look
correct

  tmstats: external 0 packets, 0 bytes

           internal 0 packets, 0 bytes

  30 second output rate 0 Kbits/sec 

Router2#

 

________________________


J.C. Hall

Network Administrator

cybertrails

"providing internet solutions"

623.434.6066 Desk

623.764.8726 Mobile

jc.hall at cybertrails.net

http:// <http://www.cybertrails.com> www.cybertrails.com

________________________