EIGRP Avenue Summarization
EIGRP provides the easiest and best aboveboard rules for summarizing routes as compared
with RIPv2, OSPF, and IS-IS. To abridge routes, the ip summary-address eigrp as-number
network-address subnet-mask [admin-distance] command is placed beneath an interface. If any of
the basic routes are in that router’s acquisition table, EIGRP advertises the arbitrary avenue out
that interface. The arbitrary is authentic by the network-address subnet-mask parameters.
One of the added absorbing appearance of the EIGRP arbitrary is the adeptness to set the AD of the
summary route. The AD is not advertised with the route; the summarizing router, however, uses
the configured AD to actuate whether the absent avenue for the arbitrary should be put into its
routing table. The EIGRP AD for arbitrary routes defaults to 5.