CHAPTER
57-1
Cisco 7600 Series Router Cisco IOS Software Configuration Guide, Release 12.2SX
OL-4266-08
57
Using the Layer 2 Traceroute Utility
This chapter describes how to use the Layer 2 traceroute utility. Release 12.2(18)SXE and later releases
support the Layer 2 traceroute utility.
Note For complete syntax and usage information for the commands used in this chapter, refer to the Cisco IOS
Master Command List, Release 12.2SX at this URL:
http://www.cisco.com/en/US/docs/ios/mcl/122sxmcl/12_2sx_mcl_book.html
This chapter contains these sections:
• Understanding the Layer 2 Traceroute Utility, page 57-1
• Usage Guidelines, page 57-2
• Using the Layer 2 Traceroute Utility, page 57-3
Tip For additional information (including configuration examples and troubleshooting information), see the
documents listed on this page:
http://www.cisco.com/en/US/products/hw/routers/ps368/tsd_products_support_series_home.html
Understanding the Layer 2 Traceroute Utility
The Layer 2 traceroute utility identifies the Layer 2 path that a packet takes from a source device to a
destination device. Layer 2 traceroute supports only unicast source and destination MAC addresses. The
utility determines the path by using the MAC address tables of the routers in the path. When the Layer
2 traceroute utility detects a device in the path that does not support Layer 2 traceroute, it continues to
send Layer 2 trace queries and allows them to time out.
The Layer 2 traceroute utility can only identify the path from the source device to the destination device.
The utility cannot identify the path that a packet takes from the source host to the source device or from
the destination device to the destination host.
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