Cisco Catalyst 3650 series Command Reference Manual page 1003

• If an ARP entry does not exist, the device sends an ARP query and tries to resolve the IP address. The
The Layer 2 traceroute feature is not supported when multiple devices are attached to one port through hubs
(for example, multiple CDP neighbors are detected on a port).
When more than one CDP neighbor is detected on a port, the Layer 2 path is not identified, and an error
message appears.
This feature is not supported in Token Ring VLANs.
Examples This example shows how to display the Layer 2 path by specifying the source and destination IP addresses
and by using the detail keyword:
Device# traceroute mac ip 2.2.66.66 2.2.22.22 detail
Translating IP to mac .....
2.2.66.66 => 0000.0201.0601
2.2.22.22 => 0000.0201.0201
Source 0000.0201.0601 found on con6[WS-C2950G-24-EI] (2.2.6.6)
con6 / WS-C3750E-24TD / 2.2.6.6 :
con5 / WS-C2950G-24-EI / 2.2.5.5 :
con1 / WS-C3550-12G / 2.2.1.1 :
con2 / WS-C3550-24 / 2.2.2.2 :
Destination 0000.0201.0201 found on con2[WS-C3550-24] (2.2.2.2)
Layer 2 trace completed.
This example shows how to display the Layer 2 path by specifying the source and destination hostnames:
Device# traceroute mac ip con6 con2
Translating IP to mac .....
2.2.66.66 => 0000.0201.0601
2.2.22.22 => 0000.0201.0201
Source 0000.0201.0601 found on con6
con6 (2.2.6.6) :Gi0/0/1 => Gi0/0/3
con5
con1
con2
Destination 0000.0201.0201 found on con2
Layer 2 trace completed
This example shows the Layer 2 path when ARP cannot associate the source IP address with the corresponding
MAC address:
Device# traceroute mac ip 2.2.66.66 2.2.77.77
Arp failed for destination 2.2.77.77.
Layer2 trace aborted.
IP addresses must be in the same subnet. If the IP address is not resolved, the path is not identified, and
an error message appears.
Gi0/0/1 [auto, auto] => Gi0/0/3 [auto, auto]
Fa0/3 [auto, auto] => Gi0/1 [auto, auto]
Gi0/1 [auto, auto] => Gi0/2 [auto, auto]
Gi0/2 [auto, auto] => Fa0/1 [auto, auto]
(2.2.5.5
(2.2.1.1
(2.2.2.2
) : Gi0/0/3 => Gi0/1
) : Gi0/0/1 => Gi0/2
) : Gi0/0/2 => Fa0/1
Command Reference, Cisco IOS XE Everest 16.5.1a (Catalyst 3650 Switches)
traceroute mac ip
977