Command:

debug ip igrp transactions


Mode:

Router#


Syntax:

debug ip igrp transactions [ip-address]

no debug ip igrp transactions [ip-address]

Syntax Description:

ip-address (Optional) The IP address of an IGRP neighbor.

Command Description:

 

To display transaction information on Interior Gateway Routing Protocol (IGRP) routing transactions,

use the debug ip igrp transactions privileged EXEC command. The no form of this command disables

debugging output.

If the IP address of an IGRP neighbor is specified, the resulting debug ip igrp transactions output

includes messages describing updates from that neighbor and updates that the router broadcasts toward

that neighbor.

When many networks are in your routing table, the debug ip igrp transactions command can flood the

console and make the router unusable. In this case, use the debug ip igrp events command instead to

display summary routing information.


Example:

The following is sample output from the debug ip igrp transactions command:

 

Router# debug ip igrp transactions

IGRP: received update from 160.89.80.240 on Ethernet

subnet 160.89.66.0, metric 1300 (neighbor 1200)

subnet 160.89.56.0, metric 8676 (neighbor 8576)

subnet 160.89.48.0, metric 1200 (neighbor 1100)

subnet 160.89.50.0, metric 1300 (neighbor 1200)

subnet 160.89.40.0, metric 8676 (neighbor 8576)

network 192.82.152.0, metric 158550 (neighbor 158450)

network 192.68.151.0, metric 1115511 (neighbor 1115411)

network 150.136.0.0, metric 16777215 (inaccessible)

exterior network 129.140.0.0, metric 9676 (neighbor 9576)

exterior network 140.222.0.0, metric 9676 (neighbor 9576)

IGRP: received update from 160.89.80.28 on Ethernet

subnet 160.89.95.0, metric 180671 (neighbor 180571)

subnet 160.89.81.0, metric 1200 (neighbor 1100)

subnet 160.89.15.0, metric 16777215 (inaccessible)

IGRP: sending update to 255.255.255.255 via Ethernet0 (160.89.64.31)

subnet 160.89.94.0, metric=847

IGRP: sending update to 255.255.255.255 via Serial1 (160.89.94.31)

subnet 160.89.80.0, metric=16777215

subnet 160.89.64.0, metric=1100

 

The output shows that the router being debugged has received updates from two other routers on the

network. The router at source address 160.89.80.240 sent information about ten destinations in the

update; the router at source address 160.89.80.28 sent information about three destinations in its update.

The router being debugged also sent updates�in both cases to the broadcast address 255.255.255.255

as the destination address.

 

On the second line the first field refers to the type of destination information: "subnet" (interior),

"network" (system), or "exterior" (exterior). The second field is the Internet address of the destination

network. The third field is the metric stored in the routing table and the metric advertised by the neighbor

sending the information. "Metric... inaccessible" usually means that the neighbor router has put the

destination in a hold down state.

 

The entries show that the router is sending updates that are similar, except that the numbers in

parentheses are the source addresses used in the IP header. A metric of 16777215 is inaccessible.

Other examples of output that the debug ip igrp transactions command can produce follow.

The following entry indicates that the routing table was updated and shows the new edition number (97

in this case) to be used in the next IGRP update:

 

IGRP: edition is now 97

 

Entries such as the following occur on startup or when some event occurs such as an interface making a

transition or a user manually clearing the routing table:

 

IGRP: broadcasting request on Ethernet0

IGRP: broadcasting request on Ethernet1

 

The following type of entry can result when routing updates become corrupted between sending and

receiving routers:

 

IGRP: bad checksum from 172.69.64.43

An entry such as the following should never appear. If it does, the receiving router has a bug in the

software or a problem with the hardware. In either case, contact your technical support representative.

IGRP: system 45 from 172.69.64.234, should be system 109


Misconceptions:

           None.


Related Commands:

            None. 


� Cisco Systems, Inc. 2001, 2002, 2003
World Wide Education

Converted from CHM to HTML with chm2web Pro 2.85 (unicode)