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New Member

OSPF cost on a vlan, SVI

i have auto cost reference set to   auto-cost reference-bandwidth 10 Gbps.  When I do sh ospf interface brief, i see that vlans have a cost of 10.  I have few other 10gig links and they have a cost of 1, which it should be.  Why do the vlans have a cost of 10?  Shouldn't it be 1, since the vlans are SVIs that go over a 10gig link?

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New Member

Re: OSPF cost on a vlan, SVI

The default BW of an SVI is 1Gb and this is derived because the internal inband route processor is 1Gb. Pls reference the 2nd to last para in the article linked below. HTH.

http://www.cisco.com/en/US/tech/tk389/tk815/technologies_configuration_example09186a008019e74e.shtml

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Hall of Fame Super Silver

OSPF cost on a vlan, SVI

On a physical interface we know what the bandwidth should be because of its physical media connection and we can determine what its OSPF cost should be. But with an SVI we are looking at a virtual interface and Cisco must make some arbitrary assignment of bandwidth because there is not any physical basis for the assignment of bandwidth.

HTH

Rick

New Member

Re: OSPF cost on a vlan, SVI

The default BW of an SVI is 1Gb and this is derived because the internal inband route processor is 1Gb. Pls reference the 2nd to last para in the article linked below. HTH.

http://www.cisco.com/en/US/tech/tk389/tk815/technologies_configuration_example09186a008019e74e.shtml

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