You can use the following command:
debug packet capture on vr-id 0 interface eth0 count 1000
This will take a capture of 1000 packets.
Next you can use the following command to check the "ls /usr/local/tmp" for the filename:
To get the capture off the switch, upload it to a TFTP server by issuing the following command:
tftp put <TFTP server IP address> vr <VR> /usr/local/tmp/<filename>