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OSPF Area 0 routing

Hi there,

I have four routers, Cisco 3745-1, Cisco 3745-2, Cat 4506-1 and Cat 4506-2. Cat 4506-1 and Cat4506-2 connect together via dot1q trunking for Vlan 1 and Vlan 2 as ospf area 1. The Cat 4506-1 Vlan 3 is configured with area 0, which connects to the Cisco 3745-1. While the Cat 4506-2 Vlan 4 is configured with area 0, which connects to the CIsco 3745-2. The two Cisco 3745-1 and Cisco 3745-2 are backone router with all interfaces as area 0. There is a WAN link (interface S0/0) configured at both of the Cisco 3745 routers connecting to HQ.

I have found when the Cisco 3745-1 s0/0 is unplugged, the Cat 4506-1 cannot learn HQ routes from Cat 4506-2 via vlan 1 or vlan 2(area 1).

But I find some more findings at the time as below:

1. The Cat 4506-2 can learn HQ routes from Cisco 3745-2 router.

2. The OSPF neighbor relation between Cat 4506-1 and Cat 4506-2 are full.

3. The relation between Cat 4506-1 and Cisco 3745-1 is full as well.

May I ask that is it normal for the Cat 4506-1 cannot learn other area routes via area 1, with the same time that the area 0 neighbor is still alive?

Also, may I ask that if the Cat 4506-1 area 0 neighbor die, can it learn other area routes via area 1?

thanks a lot

David

1 REPLY
Bronze

Re: OSPF Area 0 routing

David,

Two questions-

1. Is Area 1 either a stub area or a NSSA?

2. With the cable in s0/0 of 3745-1 unplugged, can 4506-1 learn the address of VLAN 4?

Mark

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