From: Popgeorgiev Nikolay (nikolay.popgeorgiev@siemens.com)
Date: Fri Feb 03 2006 - 12:44:45 GMT-3
Dear friends,
Sorry if it is not very clear, if you are interested in this case and you don't understand it well I will explain in more detail.
I have a very strange behavior with a ospf network. Here is my case.
SW1 -lan-R1---lan ---R2----lan---R3--lan--Sw1
SW1(vlan33interface), R1(fa0,fa1), R2(fa0,fa1),R3(fa0) - in area 1 nssa !
SW1(loop0 - 20.0.0.1) in area 0,
SW1 and R3 are on common network but no direct ospf relation.
On SW1 I redistribute connected subnets into ospf, and have a network statement for loop0
On R3 I have a static route (20.0.0.0 255.255.255.0 ) to null0, and I have redistribute static subnet.
Results:
Sw1 - receives O routes, N2 from R3 as expected
R1 - receives N2 form SW(the connected networks) + N2 from R3(the redistributed static) +IA form SW1 - as expected
R2 - receives N2 form SW(the connected networks) + N2 from R3(the redistributed static) +IA form SW1 - as expected
R3 !!! - receives IA from SW1, but NO N2s from SW1 ???
It has them in the database but not installing in routing table. I noticed that when I shut the interface fa1(the interface to SW1) routes appear in the routing table. The forwarding address is 172.16.0.10 which is an address from the lan on which are both R3 and SW1. So R3 has a direct connection to it. When I shut the interface fa1(172.16.0.3) R3 reaches 172.16.0.10 through R2, R1 and routes are installed correctly? So it is something about reachability of the forwarding address (which reminds me of BGP)
If you have idea please share it with me.
Thanks
R3#sh ip ospf database nssa-external 1.1.1.0
OSPF Router with ID (3.3.3.3) (Process ID 1)
Type-7 AS External Link States (Area 1)
LS age: 798
Options: (No TOS-capability, No Type 7/5 translation, DC)
LS Type: AS External Link
Link State ID: 1.1.1.0 (External Network Number )
Advertising Router: 172.16.0.10
LS Seq Number: 80000002
Checksum: 0x8F7D
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