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This Question is Not Answered 1 Correct Answer available (4 pts) 2 Helpful Answers available (2 pts)
3109 Views 2 Replies Latest reply: Mar 14, 2012 7:07 AM by Michael Büchel RSS

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ospf costs on vlan interfaces

Mar 8, 2012 12:47 AM

Michael Büchel 20 posts since
Jan 19, 2010

Hello all,


we use ospf in our network for routing and changed the default bandwith with the command


ospf auto-cost reference-bandwidth 10000


After that, the cost for a Gigabit-Interface counts to 10 as expected, for 100MB-interfaces it

counts 100 and for TenGigabit it goes to 1.


Fine so far, however, when we look at the networks routed through the TenGig-Interfaces, they

still have cost of 10.


I remeber a cisco-document where it is explained that for vlans the cost is left 10 after changing

the reference bandwidth and one should manually change that via "ospf cost 1" - when having a


Does somebody know docs from cisco regarding that topic? is it a bug? May i change the cost
of the vlan intercae without having downtime?


Thanks for advance for your help,


best regards,




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