17. For IGRP routing, you need
to provide the AS (Autonomous
System) number in the command.
Routers need AS number to
exchange routing information.
Routers belonging to same AS
exchange routing information.
18. IGRP:
-
IGRP update packet
is sent every 90 seconds by
default. This is 30 Sec for RIP.
-
By giving the
command "show ip route igrp", we
can see the routes found by
IGRP. A route discovered by IGRP
is denoted by letter "I" before
start of the entry.
-
The following
three types of routes are
recognized by IGRP:
1.
Interior: Interior routes
are those that are directly
connected to a router interface.
2.
System: Routes advertised
by other IGRP neighbors within
the same autonomous system (AS).
3.
Exterior: These are the
routes learned from a different
Autonomous System number (ASN).
