Alcatel Carrier Internetworking Solutions 6800 User Manual

Troubleshooting Virtual Router Redundancy Protocol (VRRP)

Dshell Troubleshooting

OmniSwitch Troubleshooting Guide

page 13-11

In a situation where VRRP is flapping, go into Dshell of the switch that is configured as the backup virtual 
router that is flapping and enter vrrpTMon(1, vrid, vlanId). For example, for virtual router 200 on VLAN 
200 the command will be:  vrrpTMon(1,200,200). You should then see the advertisements arriving once 
per second on your console. Before running Dshell commands make sure to verify the configuration of all 
VRRP participated switches.

Note. Dshell commands should only be used by Alcatel personnel or under the direction of Alcatel. 
Misuse or failure to follow procedures that use Dshell commands in this guide correctly can cause lengthy 
network down time and/or permanent damage to hardware.

7800-1 -> dshell
Working: [Kernel]->vrrpTMon (1,200,200)
vrrpDbg = 00000010 vrrpDbgVR = 00C800C8
value = 1 = 0x1

Working: [Kernel]->
I 54758886   VRID 200  VLAN 200
  4500 0014 0DC3 0000 FF70 0000 ACC8 011C
  E000 0012 21C8 FF01 0001 3150 ACC8 011C
  0000 0000 0000 0000

I 54758986   VRID 200  VLAN 200
  4500 0014 7449 0000 FF70 0000 ACC8 011C
  E000 0012 21C8 FF01 0001 3150 ACC8 011C
  0000 0000 0000 0000

I 54759086   VRID 200  VLAN 200
  4500 0014 E847 0000 FF70 0000 ACC8 011C
  E000 0012 21C8 FF01 0001 3150 ACC8 011C
0000 0000 0000 0000

Watch for the sequence number increasing. This indicates 3 hello packets received in 3 seconds.

Disable this Dshell command by setting value 0.

Working: [Kernel]->vrrpTMon 0