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The traceroute mac ip command output shows the Layer 2 path when the specified source and destination IP addresses are in the same subnet.

This feature is not supported in Token Ring VLANs.

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).

The traceroute mac command output shows the Layer 2 path when the specified source and destination addresses belong to the same VLAN.

Layer 2 traceroute supports only unicast traffic.

The maximum number of hops identified in the path is ten.

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.

For Layer 2 traceroute to function properly, Cisco Discovery Protocol (CDP) must be enabled on all the switches in the network.

Source not directly connected, tracing source. … and to have more detail about the trace use the ‘detail’ option: Ciscozine-SW1#traceroute mac ip 192.168.0.4 192.168.0.6 detail

In the first case, use the command ‘traceroute mac 0019.9955.0f60 0b’ Ciscozine-SW1#traceroute mac 0019.9955.0f60 0b You have two options to find the path between two hosts: Protocol Address Age (min) Hardware Addr Type Interface Total Mac Addresses for this criterion: 6 Suppose to have two host (192.168.0.4, 192.168.0.6) and you would find the layer2 path using the Ciscozine-SW1 Switch.īelow the MAC address table and the ARP table of the Ciscozine-SW1 switch: Ciscozine-SW1#sh mac-address-table dynamic See you the example to understand how this feature works. If you specify source and destination addresses that belong to different VLANs, the Layer 2 path is not identified, and an error message appears. The traceroute mac command output shows the Layer2 path when the specified source and destination addresses belong to the same VLAN. To do it, Cisco has implemented a good tool: traceroute mac. In a Data Center, it is often required to find a host and the layer2 path.

Routers decrement this parameter and discard a packet when the TTL value has reached zero, returning an ICMP error message (ICMP Time Exceeded) to the sender. Tracing the intermediate routers traversed involves control of the time-to-live (TTL) Internet Protocol parameter. Traceroute sends a sequence of Internet Control Message Protocol (ICMP) packets addressed to a destination host.

Traceroute is a tool for measuring the route path and transit times of packets across an Internet Protocol (IP) network.