EIGRP

EIGRP
Basic EIGRP redistribution is exactly the same as basic IGRP redistribution. EIGRP, however,
is a classless routing protocol. Like IGRP, EIGRP requires you to specify a metric except when
the redistribution occurs with another instance of EIGRP or IGRP. All instances of EIGRP and
IGRP use the same composite style of metrics, meaning that the metric will carry across the
redistribution. Redistributing any other routing protocol, except EIGRP or IGRP, into EIGRP
will require you to set the metric. If a metric is not specified, the metric value defaults to 0.
Because EIGRP uses a composite metric, it will not understand a metric of 0 and the routes will
not be used. Be smart and always supply a metric for routes being redistributed into EIGRP.