RE: Lab 10 Volume 1

*sorry email sent prematurely*

Hey everyone,

I'm having some strange issues with reachability with OSPF on Lab 10 that I
can't figure out. Here is an example of something I'm seeing

R2--s0/1/0.256---Frame Cloud---s0/1/0--R5-fa0/0--Ethernet-fa0/0--R7

R2 has its s0/1/0.256 in Area 0
R5 has its s0/1/0 in Area 0
R5 has its fa0/0 in Area 567
R7 has its fa0/0 in Area 567

R5 is an ABR with interfaces in both areas and R7 has an interface in 567. So
far no rules have been broken (area 567 touches area 0 on R5) and inter-area
communication should be working between the three routers, but it doesn't. As
a test on R7 I just added the loopback interface to the OSPF process in area
567

R7(config)#router os 1
R7(config-router)#net 200.0.0.7 0.0.0.0 area 567

On R5 I verified the route and I can ping the loopback on R7

R5#sh ip ro 200.0.0.7
Routing entry for 200.0.0.7/32
  Known via "ospf 1", distance 110, metric 11, type intra area
  Last update from 150.100.220.7 on FastEthernet0/0, 00:03:51 ago
  Routing Descriptor Blocks:
  * 150.100.220.7, from 200.0.0.7, 00:03:51 ago, via FastEthernet0/0
      Route metric is 11, traffic share count is 1

R5#ping 200.0.0.7
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 200.0.0.7, timeout is 2 seconds:
!!!!!

So we are good from R5 to R7 but not to R2 who has the route but can't ping

R2#sh ip route 200.0.0.7
Routing entry for 200.0.0.7/32
  Known via "ospf 1", distance 110, metric 1573, type inter area
  Last update from 150.100.100.5 on Serial0/1/0.256, 00:00:14 ago
  Routing Descriptor Blocks:
  * 150.100.100.5, from 200.0.0.5, 00:00:14 ago, via Serial0/1/0.256
      Route metric is 1573, traffic share count is 1

R2#ping 200.0.0.7
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 200.0.0.7, timeout is 2 seconds:
.....
If I run a debug on R2 and then run a ping to 200.0.0.7 it shows routed vis
FIB like this

R2(config)#access-list 101 permit icmp any any
R2(config)#do deb ip pack 101 de
R2(config)#do ping 200.0.0.7
Sending 5, 100-byte ICMP Echos to 200.0.0.7, timeout is 2 seconds:

*May 13 00:29:37.057: IP: tableid=0, s=150.100.100.2 (local), d=200.0.0.7
(Serial0/0.256), routed via FIB

So it R2 knows how to get to R7 the issue must be that R7 doesn't know how to
get to back to R2

R7#sh ip ro 200.0.0.2
% Subnet not in table

It seems like Area 0 routes aren't coming over to Area 567, any ideas?

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Received on Wed Apr 14 2010 - 19:03:00 ART