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What is the function of route injection in ISIS?

Latest reply: Mar 10, 2016 19:24:34 1174 1 0 0 0

What is the function of route injection in ISIS?

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Created Mar 10, 2016 19:24:34

In ISIS, intra-area routings was managed by the router in Level-1 area and all Level-2 routers constitute a Level-2 area.
An IS-IS routing domain can contain many Level-1 areas, but only one Level-2 area. Level-1 areas must be connected to the Level-2 area, and different Level-1 areas can not connect to each other. The routing information of level-1 area through the Level-1-2 router communicated to the Level-2 area. Therefore, Level-2 routers know the routing information of entire IS-IS routing domain. However, by default, Level-2 router does not communicate other Level-1 areas and Level-2 area routing information to Level-1 area, so Level-1 routers will not have the routing information outside of the region. That may result that the best route is not chosen for the destination network outside of the region. To solve this problem, ISIS provides routing injection function. The Level-2 routers can advertise the routing information of other Level-1 areas and Level-2 areas to the designated Level-1 area
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