Specifications

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Cisco ME 3400 Ethernet Access Switch Command Reference

OL-9640-07

Chapter 2 Cisco ME 3400 Ethernet Access 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]

Note Layer 2 traceroute is available only on network node interfaces (NNIs).

Syntax Description

Defaults There is no default.

Command Modes Privileged EXEC

Command History

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.

Note Layer 2 traceroute is available only on NNIs.

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.

interface interface-id (Optional) Specify an interface on the source or destination switch.

source-mac-address Specify the MAC address of the source switch in hexadecimal format.

destination-mac-address Specify the MAC address of the destination switch in hexadecimal format.

vlan vlan-id (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.

detail (Optional) Specify that detailed information appears.

Release Modification

12.2(25)EX This command was introduced.