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IS-IS
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== Adjacency formation == Compared to OSPF, in IS-IS rules and conditions of adjacency formation are much simpler and mainly depend on the router level. * L1 router cannot form any adjacency with L2 router under any conditions. * L1 router can form L1 adjacency with other L1 router if their areas match. * L1 router can form L1 adjacency with L1/L2 router if their areas match. * L2 router can form L2 adjacency with other L2 router regardless of their areas (they don't need to match). * L2 router can form only L2 adjacency with other L1/L2 router regardless of their areas (they don't need to match). * L1/L2 router can form both L2 and L1 adjacency with other L1/L2 router if their areas match.
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