Tuesday, September 27, 2011

OSPF Distance command

The OSPF distance command can be used in a number of different ways.   I found the first one is well documented on the doc cd in the ospf routing section. However  the next three are strangely absent therein.  There is some info under the general distance command but this does not detail its use in OSPF.

I) distance ospf {external/inter-area/intra-area} AD
II) distance AD - this sets the distance for all routes

III) distance AD {ip-address wild-card-mask} - this sets the distance for all routes learned from a specific source-router. The source router is the RID of the link-state router that origininated the route!!!

IV) distance AD (ip-address wild-card0mask} ACL  identical to the previous command but it is applied to only a subset of routes that match the ACL.

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