[c-nsp] OSPF Reference bandwidth auto-cost and LAG

Alastair Johnson aj at sneep.net
Mon Aug 11 06:55:47 EDT 2008


Hi,

I am trying to understand how IOS implements the OSPF reference 
bandwidth related to LAG interfaces.

The only background material I can find on this is along the lines of:
http://www.cisco.com/en/US/tech/tk365/technologies_q_and_a_item09186a0080094704.shtml#q3

Can anyone confirm whether LAG/Port-Channel interfaces have the 
reference BW recalculated based on the active member links?

e.g. if I have ref BW = 100G, and a P-C with 2 10GE links, it should be 
metric = 5.

If one 10GE link disappears from the bundle, do I have metric = 10?

thanks,

aj


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