FWSM failover pair on 3.1(3) - OSPF problem?

Unanswered Question
Jul 30th, 2007

2x 6513/MSFC with FWSM in each, controlling staff/student access to internal servers. 6513s are trunked together, so vlans 10 and 20 appear on each.

OSPF on all devices.

workstation on vlan10 routes to 6513-A (via hsrp-address)

then via vlan 20 to FWSM-A (active state)

FWSM-A has the same OSPF cost to 6513-A and to 6513-B, which both interface to vlan 10, so FWSM-A has equal-cost routes back to vlan 10 via both switches.

I'm not sure if this IS a problem, but it doesn't sound too clever.

I wanted to try -

router ospf 1

neighbor b.b.b.b cost 100

on the FWSM to "un-equal" the cost, but the command doesn't allow "cost"

Any ideas?

I have this problem too.
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srue Mon, 07/30/2007 - 06:52

can you set the interface cost on the firewall port?

keithredding Mon, 07/30/2007 - 08:55


FWSM-Server-Firewall(config-if)# ospf cost 100

.... but the new cost then applies to both 6513s - there's no option to specify different costs for different neighbors.

purohit_810 Mon, 07/30/2007 - 07:08

set channel vlancost {Vlan} 10

set spantree portvlancost 3/47 cost 16 1-1005

set spantree portcost


Dharmesh Purohit


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