Alcatel Carrier Internetworking Solutions 6648 User Manual

DVMRP Troubleshooting

Troubleshooting DVMRP

page 15-4

OmniSwitch Troubleshooting Guide

192.168.10.1       1       No       1         Enabled      Enabled
192.168.11.1       2       No       1         Enabled      Enabled
192.168.12.1       3       No       1         Enabled      Enabled

Remote routes will be seen if they are learned from another switch. Again be sure that the interfaces are 
enabled. If that is the case it possible that the other switch is not configured correctly. 

If the above commands look good in your switch and in the other switches you can use the following 
command to see if the switch has a next hop. If it does the problem may not be this switch. It may be the 
next switch on the VLAN indicated here.

-> show ip dvmrp nexthop

Src Address/Mask     Vlan   Hop Type

--------------------+-------+----------

192.168.10.25/24    2      branch

If you have looked at all the switches and you are sure you have configured correctly then it is time to use 
the DVMRP Debug command.

-> show ip dvmrp debug
Debug Level

= 1,

Error

= on,

Flash

= off,

Grafts

= off,

IGMP

= off,

Init

= off,

IPMRM

= off,

MIP

= off,

Misc

= off

Nbr

= off,

Probes

= off,

Prunes

= off,

Routes

= off,

Time

= off,

TM

= off,

Notice that by default the Debug Level is 1 and the only Debug Type configured is error messages. These 
can be changed with the following commands. 

-> ip dvmrp debug-type ?

^
TM TIME ROUTES PRUNES PROBES NBR MISC MIP IPMRM INIT
IGMP GRAFTS FLASH ERROR ALL

(IP Routing & Multicast Command Set)

-> no ip dvmrp debug-type ?

^
TM TIME ROUTES PRUNES PROBES NBR MISC MIP IPMRM INIT
IGMP GRAFTS FLASH ERROR ALL

(IP Routing & Multicast Command Set)

-> ip dvmrp debug-level 95

-> ip dvmrp debug-level 1

The first command turns on a debug-type while the second turns off a debug type.