Cisco WS-C3560E-24PD-E Command Reference - Page 688
traceroute mac
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traceroute mac Chapter 2 Catalyst 3560 Switch Cisco IOS Commands traceroute mac Use the traceroute mac privileged EXEC command to display the Layer 2 path taken by the packets from the specified source MAC address to the specified destination MAC address. traceroute mac [interface interface-id] {source-mac-address} [interface interface-id] {destination-mac-address} [vlan vlan-id] [detail] Syntax Description interface interface-id source-mac-address destination-mac-address vlan vlan-id detail (Optional) Specify an interface on the source or destination switch. Specify the MAC address of the source switch in hexadecimal format. Specify the MAC address of the destination switch in hexadecimal format. (Optional) Specify the VLAN on which to trace the Layer 2 path that the packets take from the source switch to the destination switch. Valid VLAN IDs are 1 to 4094. (Optional) Specify that detailed information appears. Defaults There is no default. Command Modes Privileged EXEC Command History Release 12.1(19)EA1 Modification This command was introduced. Usage Guidelines For Layer 2 traceroute to function properly, Cisco Discovery Protocol (CDP) must be enabled on all the switches in the network. Do not disable CDP. When the switch detects a device in the Layer 2 path that does not support Layer 2 traceroute, the switch continues to send Layer 2 trace queries and lets them time out. The maximum number of hops identified in the path is ten. Layer 2 traceroute supports only unicast traffic. If you specify a multicast source or destination MAC address, the physical path is not identified, and an error message appears. The traceroute mac command output shows the Layer 2 path when the specified source and destination addresses belong to the same VLAN. If you specify source and destination addresses that belong to different VLANs, the Layer 2 path is not identified, and an error message appears. If the source or destination MAC address belongs to multiple VLANs, you must specify the VLAN to which both the source and destination MAC addresses belong. If the VLAN is not specified, the path is not identified, and an error message appears. 2-656 Catalyst 3560 Switch Command Reference 78-16405-05