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which in this case is only 172.16.251.2 (Ames, as in line 16). NewYork sets the reply flag on (line 16), which indicates that NewYork expects a reply to the query. Ames receives the query and marks its topology table entry for 172.16.50.0 via NewYork as down. Next, Ames checks its topology table for a feasible successor:

From

Cover of IP Routing

Note

When an eigrp router expect a reply from a neighbor