When most network engineer think of route filtering, they automatically assume that some kind of distribute list is required. However, it is important to think outside the box and consider all possible options before implementing a route filtering policy. Recall that in Cisco IOS software, administrative distance is used to determine the reliability of one source of routing information from another and is a locally significant value.
Different route sources are assigned different administrative distance values. This default value in an integer between 0 and 255, with a value of 0 assigned to the most reliable source of information and . . .
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