Cisco WS-C3560E-48PD-SF Command Reference - Page 691
traceroute mac ip
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Chapter 2 Catalyst 3560 Switch Cisco IOS Commands traceroute mac ip traceroute mac ip Use the traceroute mac ip privileged EXEC command to display the Layer 2 path taken by the packets from the specified source IP address or hostname to the specified destination IP address or hostname. traceroute mac ip {source-ip-address | source-hostname} {destination-ip-address | destination-hostname} [detail] Syntax Description source-ip-address destination-ip-address source-hostname destination-hostname detail Specify the IP address of the source switch as a 32-bit quantity in dotted-decimal format. Specify the IP address of the destination switch as a 32-bit quantity in dotted-decimal format. Specify the IP hostname of the source switch. Specify the IP hostname of the destination switch. (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 an 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. The traceroute mac ip command output shows the Layer 2 path when the specified source and destination IP addresses are in the same subnet. When you specify the IP addresses, the switch uses Address Resolution Protocol (ARP) to associate the IP addresses with the corresponding MAC addresses and the VLAN IDs. • If an ARP entry exists for the specified IP address, the switch uses the associated MAC address and identifies the physical path. • If an ARP entry does not exist, the switch sends an ARP query and tries to resolve the IP address. The 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. 78-16405-05 Catalyst 3560 Switch Command Reference 2-659