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Troubleshooting BOOTP/DHCP/UDP Relay Advanced Troubleshooting for UDP Relay
OmniSwitch Troubleshooting Guide September 2005 page 5-5
Preliminary
6/5/06
Advanced Troubleshooting for UDP Relay
To monitor the UDP traffic, the debug ip packet protocol udp CLI command can be used.
Note. See the “IP Commands” chapter in the OmniSwitch CLI Reference Guide for more information.
The output below shows the entire conversation of a DHCP client with MAC address 000039:73130 in
VLAN 20 to a DHCP server in VLAN 10 with a IP address of 10.10.10.58. (Note the sequence of
“Discover-Offer-Request-Acknowledge” shown.) This network is diagramed in the figure on page 5-2.
This output can be very verbose if done on a live switch and it can be useful to type in the stop command
prior to the start command and use the arrow up key to stop the debug display. (The stop command is the
debug ip packet protocol udp stop CLI command.
-> debug ip packet protocol udp start
C R 5/3 00003973130e->ffffffffffff IP 0.0.0.0->255.255.255.255 UDP 68,67
Discover with time=0
C R 5/3 00003973130e->ffffffffffff IP 0.0.0.0->255.255.255.255 UDP 68,67
Discover
C S 5/10 00d09579628b->00c04f046c2a IP 10.10.10.200->10.10.10.58 UDP 67,67
Relayed Discover
C R 5/10 00c04f046c2a->00d09579628b IP 10.10.10.58->20.20.20.200 UDP 67,67 Offer
C S 1/F 00d09579628d->ffffffffffff IP 10.10.10.58->255.255.255.255 UDP 67,68
Relayed Offer
C R 5/3 00003973130e->ffffffffffff IP 0.0.0.0->255.255.255.255 UDP 68,67 Request
C S 5/10 00d09579628b->00c04f046c2a IP 10.10.10.200->10.10.10.58 UDP 67,67
Relayed Request
C R 5/10 00c04f046c2a->00d09579628b IP 10.10.10.58->20.20.20.200 UDP 67,67
Acknowledge
C S 1/F 00d09579628d->ffffffffffff IP 10.10.10.58->255.255.255.255 UDP 67,68
Relayed Acknowledge
5 R CMM (00d09579628b)->(00c04f046c2a) IP 10.10.10.200->10.10.10.58 UDP 67,67
5 S 5/10 00d09579628b->00c04f046c2a IP 10.10.10.200->10.10.10.58 UDP 67,67
5 R CMM (00d09579628b)->(00c04f046c2a) IP 10.10.10.200->10.10.10.58 UDP 67,67
5 S 5/10 00d09579628b->00c04f046c2a IP 10.10.10.200->10.10.10.58 UDP 67,67
5 R 5/3 00003973130e->(ffffffffffff) ARP Request 20.20.20.1->20.20.20.1