Q: What are all the debugging and troubleshooting commands that we use to debug VRRP flapping?
A: The general basic troubleshooting steps are,
- Find out whether the FLAPS are happening because of issues with the network or the Mobility Controller?
- Check if any port errors or port flaps?
- Any changes in the network topology related to STP?
- Identify if there is a similar VRRP id exist in the same broadcast network?
Some useful commands,
show vrrp stats all
show log all
Enabling logging,
config t
logging level debugging system process fpapps
logging level debugging network process fpapps
end
Enabling packet capture
External packet capture on external Ethernet interfaces is useful to determine if VRRP packets are seen in the wired.
To enable the packet capture on the controller,
packet-capture controlpath sysmsg 68
To disable the controller packet capture,
packet-capture controlpath sysmsg disable
To view the controller packet capture setting,
show packet-capture