Serviceability Tracing Packet Commands 999
Example
console#debug ip pimsm packet
debug ip vrrp
Use the debug ip vrrp command to enable VRRP debug protocol messages. Use the “no” form 
of this command to disable VRRP debug protocol messages.
Syntax
debug ip vrrp
no debug ip vrrp
Default Configuration
Display of VRRP traces is disabled by default.
Command Mode
Privileged EXEC mode.
User Guidelines
This command has no user guidelines.
Example
console#debug ip vrrp
debug ipv6 mcache
Use the debug ipv6 mcache command to trace MDATAv6 packet reception and transmission. 
The receive option traces only received data packets and the transmit option traces only 
transmitted data packets. When neither keyword is used in the command, then all data packet 
traces are dumped. Vital information such as source address, destination address, packet length, 
and the interface on which the packet is received or transmitted is displayed on the console.
Syntax
debug ipv6 mcache packet [ receive | transmit ]
no debug ipv6 mcache packet [ receive | transmit ]
Default Configuration
Display of MDATA traces is disabled by default.