Redistribution into IGRP

Redistribution into IGRP
As we said at the beginning of this section, basic IGRP redistribution is almost the same as basic
RIP redistribution. IGRP requires you to specify a metric, except when the redistribution occurs with
another instance of IGRP or EIGRP. All instances of IGRP and EIGRP use the same composite style
of metrics. This means that the metric will carry across the redistribution. Redistributing any other
routing protocol, except IGRP or EIGRP, into IGRP requires you to set the metric. If a metric is not
specified, the metric value defaults to 0. Because IGRP uses a composite metric, it will not understand
a metric of 0 and the routes will not be used. So you must specify a metric.