Information about IGRP messages can be obtained with the debug ip igrp command. Unlike RIP, the command requires additional information. Two types of debugging information are available for IGRP – information about IGRP events, and information about IGRP transactions. The debug ip igrp events command provides summary information about the IGRP updates being sent and received, as well as the number of routes that the update contains. The debug ip igrp transaction command actually shows the routes included in the update.
RouterA#debug ip igrp events
IGRP event debugging is on
23:18:27: IGRP: received update from 10.0.20.2 on Serial0
23:18:27: IGRP: Update contains 1 interior, 0 system, and 0 exterior routes.
23:18:27: IGRP: Total routes in update: 1
23:19:24: IGRP: sending update to 255.255.255.255 via Ethernet0 (10.0.10.1)
23:19:24: IGRP: Update contains 2 interior, 0 system, and 0 exterior routes.
23:19:24: IGRP: Total routes in update: 2
RouterA#no debug ip igrp events
IGRP event debugging is off
RouterA#debug ip igrp transactions
IGRP protocol debugging is on
23:37:20: IGRP: sending update to 255.255.255.255 via Ethernet0 (10.0.10.1)
23:37:20: subnet 10.0.30.0, metric=8576
23:37:20: subnet 10.0.20.0, metric=8476
23:37:20: IGRP: sending update to 255.255.255.255 via Serial0 (10.0.20.1)
23:37:20: subnet 10.0.30.0, metric=1100
23:38:39: IGRP: received update from 10.0.20.2 on Serial0
23:38:39: subnet 10.0.30.0, metric 8576 (neighbor 1100)
RouterA#no debug ip igrp transactions
IGRP protocol debugging is off
To get a quick overview on the status of the IP routing protocols running on your system, use the show ip protocols command. Notice that for Router A, we are presented with information about both of our configured protocols, RIP and IGRP.
RouterA#sh ip protocols
Routing Protocol is "rip"
Sending updates every 30 seconds, next due in 6 seconds
Invalid after 180 seconds, hold down 180, flushed after 240
Outgoing update filter list for all interfaces is
Incoming update filter list for all interfaces is
Redistributing: rip
Default version control: send version 1, receive any version
Interface Send Recv Key-chain
Ethernet0 1 1 2
Serial0 1 1 2
Routing for Networks:
10.0.0.0
Routing Information Sources:
Gateway Distance Last Update
10.0.20.2 120 00:00:06
Distance: (default is 120)
Routing Protocol is "igrp 100"
Sending updates every 90 seconds, next due in 33 seconds
Invalid after 270 seconds, hold down 280, flushed after 630
Outgoing update filter list for all interfaces is
Incoming update filter list for all interfaces is
Default networks flagged in outgoing updates
Default networks accepted from incoming updates
IGRP metric weight K1=1, K2=0, K3=1, K4=0, K5=0
IGRP maximum hopcount 100
IGRP maximum metric variance 1
Redistributing: igrp 100
Routing for Networks:
10.0.0.0
Routing Information Sources:
Gateway Distance Last Update
10.0.20.2 100 00:01:07
Distance: (default is 100)
