Level-1 routersoperate within a single area and cannot exchange routing information with routers in other areas directly.
To reach external areas (the IS-IS backbone or other areas), Level-1 routers rely onLevel-1-2 routers, which perform inter-area route redistribution.
Therefore, a Level-1 routermust use a Level-1-2 routeras a gateway to reach destinations outside its own area.
[Reference:Huawei HCIP-Datacom-Core Technology Study Guide(Chapter: IS-IS Fundamentals – Section: Routing Levels and Area Structure), , , , ]
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