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== BFD support == IS-IS has Hello packets (IIH) which carry information about the router and are used to form adjacency. Another function of hello packets is to detect failure between routers. This can be problematic, if the routers are not directly connected to each other and there is some active equipment between them. Technically, it is possible to lower hello and hold time intervals to detect failure faster, but this can put unnecessary stress to router. Instead of this, [[Bidirectional Forwarding Detection|BFD]] can be used. Because BFD is running in data plane over UDP, it nearly does not impact main CPU. Also, BFD can provide sub-second failure detection.
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