OSPF Virtual-Link + Max Metric

Hi Guys!

I'm hoping someone might be able to help me in reasoning this through J

Partial Topology

R3:s1/3 <---- Area 5 ----- >s0/1:R2

Partial Config

R3

Int s1/3

Ip ospf cost 65535

!

Int lo0

Ip address 150.12.3.3 255.255.255.0

!

Router ospf 1

Area 5 virtual-link 150.12.2.2

R2

Router ospf 1

Area 5 virtual-link 150.12.3.3

!

Int s0/1

Ip ospf cost 1

!

Int lo0

Ip address 150.12.2.2 255.255.255.0

!

Outcome

Rack12R2#sh ip osp int bri

Interface PID Area IP Address/Mask Cost State Nbrs F/C

VL1 1 0 0.0.0.0/0 65535 DOWN 0/0

Se0/0 1 0 155.12.0.2/24 19430 P2MP 1/1

Lo0 1 5 150.12.2.2/24 1 P2P 0/0

Se0/1 1 5 155.12.23.2/24 1 P2P 1/1

Fa0/0 1 51 192.10.12.2/24 300 BDR 1/1

Rack12R3#sh ip osp int brie

Interface PID Area IP Address/Mask Cost State Nbrs F/C

VL2 1 0 155.12.23.3/24 65535 P2P 0/0

Se1/0 1 0 155.12.0.3/24 65535 P2MP 1/1

Fa0/0 1 2 155.12.37.3/24 300 BDR 1/1

Se1/2 1 4 155.12.13.3/24 65535 P2P 1/1

Lo0 1 5 150.12.3.3/24 1 P2P 0/0

Se1/3 1 5 155.12.23.3/24 65535 P2P 1/1

Rack12R3#r 150.12.2.0

Routing entry for 150.12.2.0/24

  Known via "ospf 1", distance 110, metric 65536, type intra area

  Last update from 155.12.23.2 on Serial1/3, 00:08:40 ago

  Routing Descriptor Blocks:

  * 155.12.23.2, from 150.12.2.2, 00:08:40 ago, via Serial1/3

      Route metric is 65536, traffic share count is 1

When the interface cost on r3 is dropped the virtual-link comes up

Why does the maximum metric affect the Virtual-Link from coming up but not
"native" traffic (with maximum metric) being routed out the interface?

Or could it be something else in my config causing this ?

Thanks

Blogs and organic groups at http://www.ccie.net
Received on Thu Jul 07 2011 - 07:19:21 ART