Metrics & External Routes in IS-IS Networks
The metrics for internal routes range from 0 to 63; interfaces generally have a default metric of 10.
Note
A metric is the method by which a routing algorithm determines that one route is better than another route. This information is stored in routing tables. Metrics include bandwidth, communication cost, delay, hop count, load, MTU, path cost, and reliability.
Routes from other protocols can be injected into IS-IS as external LSPs. Externals are injected as L1 and/or L2 routes and can have either internal or external metric types.
The two metric types in IS-IS are similar to type 1 and type 2 externals within OSPF. IS-IS supports externals with internal metrics (which implies that they are in the ...
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