2 Replies Latest reply: Mar 14, 2012 7:07 AM by Michael Büchel RSS

    ospf costs on vlan interfaces

    Michael Büchel

      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
      TenGig-interface.

       

      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,

       

      Michael