Hi all,
I got a weird issue today in my company lab. I set up 3 OSPF areas. Area 0
consists of 4 routers (ABR). There are no backbone routers. And they are
connected via Frame Relay translating over ATM in fully mesh configuration.
I label router 1, 2, 3 and 4. Router 1 connected to Area 1 router, Router 2
connected to Area 2 router, Router 3 connected to Area 3 router and Router 4
connected to the internal office LAN. This set up was working fine last
Friday. Every interface on those routers can ping each other. A workstation
from the internal office LAN can ping all the lab routers interfaces.
However, this morning, I lost Area 1.
area 2 router area 3 router
| |
Router 2-----Router 3
| \ / |
| \ / |
| ATM |
| / \ |
| / \ |
Router 4-----Router 1
| |
internal LAN area 1 router
On Router 1, I have 2 interfaces which are T1 and e0/0. On the T1 interface,
I define 3 subinterfaces and are connecting to ATM, Router 4 and Router 3.
The e0/0 has the IP 172.16.1.2/30. On area 1 router has faste0/0 and IP
172.16.1.1/30. Both Ethernet ports on area 1 router and Router 1 are
connected with Extreme Switch (Vlan 1).
When I do sh int on Router 1 and area 1 router, line + protocol on both
Ethernet interfaces are up. However, 172.16.1.2 can't ping 172.16.1.1!!?!?!?
And 172.16.1.1 can't ping 172.16.1.2!?!? If those IPs are up, I assume there
is a connectivity on layer 2. I shutdown both interfaces and brought them
up. It doesn't work. I thought may be because one Ethernet interface is a
fast Ethernet and there is problem with duplexing. I turn off full duplex on
both interfaces and it still doesn't work. The Vlan 1 configuration is good
on the Extreme Switch.
So here is my $64,000 question. What went wrong?!
Thanks,
Albert
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