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what is the different between a candidate default route and gateway of last resort
I am referring to ccnp route ocg pg 130
A candidate default route is a prefix that
be used as a default route, but doesn't have to. With a gateway of last resort, mainly used with the
command you set a network and a next-hop router as a last resort (default gateway). As you can see in the OCG, the I1 router has a candidate default route to network 18.104.22.168/24 because of the
ip default-network 22.214.171.124
(mind the classful nature).
By advertising the candidate default 126.96.36.199 0.0.0.255 network in EIGRP AS 1 other EIGRP routers in AS 1 see the network as a candidate default, and can have this network set as a gateway of last resort. Because the 188.8.131.52/24 prefix is the only candidate default in the IP routing table of B1, it set's the gateway of last resort to the next hop for the 184.108.40.206/24 prefix, which is L1's interface.
So they really work together in providing a default route.