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An Example R2 and R6 are L1/L2 routers. When R2 leaks the inter-area route X into the level-1 area, it can have the route attribute of nexthop to router R3. R1 can reroute to avoid R2 to reach R3 directly when R2 fails Each RSP node along the path installs the IP host route in RIB/FIB towards the path nexthop R1 R2 R3 R4 R5 R6 R7 ? IS-IS level-1 ? ? IS-IS level-2 ? Route X Route X, (nexthop R3) PLR reroute |