If I were to use the following command on a sham link:
Router1(config-if)# area <area-id> sham-link <source-address> <destination-address> cost <number>
Would the cost act the same as in a normal OSPF network, i.e. increment the existing metric (of an advertised network) by X, or would it overwrite the existing metric and the metric would then appear as X (as apposed to old metric plus X)?
If it just adds to the existing, is there any other commands that force the metric to be of a certain value?
Sham-link is a end to end OSPF on demand link across the SP backbone. You can really simplify it to be a point-to-point link across a network. So the cost of the sham-link by default is 1 and can be modified by you and this cost will add the PE-CE cost for OSPF LSA in the CE.
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