CHAPTER
10-1
Catalyst 2950 Desktop Switch Software Configuration Guide
78-14982-01
10
Configuring LRE
This chapter describes how to configure the Long-Reach Ethernet (LRE) features on your switch. This
chapter consists of these sections:
• Ports on the 2950 LRE, page 10-1
• LRE Links and LRE Profiles, page 10-2
• Configuring LRE Ports, page 10-5
• Upgrading LRE Switch Firmware, page 10-15
Note For complete syntax and usage information for the commands used in this chapter, refer to the switch
command reference for this release and the online Cisco IOS Interface Command Reference for
Release 12.1.
Ports on the 2950 LRE
The Catalyst 2950 LRE switches use Long-Reach Ethernet (LRE) technology to transfer data, voice, and
video traffic over categorized and noncategorized unshielded twisted-pair cable (Category 1, 2, and 3
structured and unstructured cable such as existing telephone lines).
Connecting a switch LRE port to a remote Ethernet device (such as a PC) requires two types of
connections:
• LRE link—This is the connection between the switch LRE port and the RJ-11 wall port on an LRE
customer premises equipment (CPE) device such as the Cisco 575 LRE CPE or Cisco 585 LRE
CPE. This connection can be through categorized or noncategorized unshielded twisted-pair cable
and can extend to distances of up to 4921 feet (1500 m).
• CPE Ethernet link—This is the connection between the CPE Ethernet port and an Ethernet device,
such as a PC. This connection is through standard Category 5 cabling and can extend to distances
of up to 328 feet (100 m).
The actual line speed in either direction between a switch LRE port and remote Ethernet device depends
on the LRE link speed and the CPE Ethernet link speed. For example, if a PC Ethernet port is configured
to 100 Mbps and the LRE port is configured with an upstream link speed of 5.69 Mbps, the actual upload
rate provided to the PC user is 5.69 Mbps, not 100 Mbps.
For LRE troubleshooting information, see the “Troubleshooting LRE Port Configuration” section on
page 28-12. Additional LRE details are in the switch command reference.
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