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Troubleshooting Virtual Router Redundancy Protocol (VRRP) OmniSwitch VRRP Troubleshooting
OmniSwitch Troubleshooting Guide September 2005 page 13-9
OmniSwitch VRRP Troubleshooting
The following commands can be used to troubleshoot VRRP:
swlog appid vrrp level debug3
Example output:
sw-2> swlog appid vrrp level debug3
+++ vrrpAdverTimer
+++ vrrpSendAdvPkt: vrid=1 pri0=0
+++ vrrpSendAdvPkt: VRID 10 (0xa) sent 20 bytes
+++ vrrpAdverTimer
+++ vrrpSendAdvPkt: vrid=1 pri0=0
+++ vrrpSendAdvPkt: VRID 10 (0xa) sent 20 bytes
+++ vrrpAdverTimer
+++ vrrpSendAdvPkt: vrid=1 pri0=0
+++ vrrpSendAdvPkt: VRID 10 (0xa) sent 20 bytes
debug ip packet protocol num 112 start timeout 30
Example output:
C S 1/F 00005e00010b->01005e000012 IP 192.168.101.254->224.0.0.18 VRRP
C S 1/F 00005e00010c->01005e000012 IP 192.168.102.254->224.0.0.18 VRRP
1 R CMM (00005e00010a)->01005e000012 IP 192.168.100.254->224.0.0.18 VRRP 33,10
1 S IPM 00005e00010a->01005e000012 IP 192.168.100.254->224.0.0.18 VRRP 33,10
1 R CMM (00005e00010b)->01005e000012 IP 192.168.101.254->224.0.0.18 VRRP 33,11
1 S IPM 00005e00010b->01005e000012 IP 192.168.101.254->224.0.0.18 VRRP 33,11
1 R CMM (00005e00010c)->01005e000012 IP 192.168.102.254->224.0.0.18 VRRP 33,12
Other things to check in case of problems:
• Use a sniffer to see if packets are send by the master VRRP router and received at the backup VRRP
routers.
• If two VRRP routers both believe that they are the masters and you have check the cabling and the port
membership of the VLAN the VRRP instance is in then it is possible that there is a disagreement in
one or more of the VRRP configured parameters. The show vrrp vrrpid statistics command will show
you if you are receiving advertisements from the other VRRP Routers and if those advertisements are
being dropped because of an error in the packet. Here is an example of the output.