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10-5
Catalyst 2950 Desktop Switch Software Configuration Guide
78-14982-01
Chapter 10 Configuring LRE
Configuring LRE Ports
Beginning with the first profile in a sequence, the switch attempts to apply each profile within that
sequence to the LRE interface. The switch continues these attempts until it converges (convergence time
refers to the time required for the switch to settle on an appropriate profile for the LRE interface). The
link is DOWN until a link is established by one of the profiles in the sequence, after which, it is UP.
For additional information on rate selection, see the “Using Rate Selection to Automatically Assign
Profiles” section on page 10-10.
CPE Ethernet Links
The CPE Ethernet link settings define the connection between the CPE Ethernet port and a remote
Ethernet device, such as a PC.
Note From CMS and the CLI, you can configure and monitor the Ethernet link on a Cisco 575 LRE CPE and
Cisco 585 LRE CPE. For information about the switch LEDs, see the Catalyst 2950 Series Hardware
Installation Guide.
Keep these considerations in mind when you have CPE devices connected to the LRE ports:
• Use the shutdown interface configuration command to disable the LRE interface transmitter on any
LRE ports that are not connected to a CPE device. This prevents access to the LRE port and prevents
the power emitted from the port from affecting other ports.
• You cannot configure the flow-control setting on the LRE ports. The flow-control setting on the CPE
Ethernet port is automatically disabled in half-duplex mode and is automatically enabled in
full-duplex mode.
• You can connect Cisco 575 LRE CPEs and Cisco 585 LRE CPEs to the same LRE switch.
• You can hot-swap the CPE devices without powering down the switch or disrupting the other switch
ports.
Use the show controllers ethernet-controller privileged EXEC command to display the internal switch
statistics, the statistics collected by the LRE switch interface, and the statistics collected by the CPE LRE
interface. For information about this command, refer to the switch command reference.
Configuring LRE Ports
These sections describe configuration guidelines and how to assign a profile to all or to individual LRE
ports. These sections contain more information about LRE links, ports, and profiles:
• Environmental Guidelines for LRE Links, page 10-6
• Guidelines for Using LRE Profiles, page 10-7
• CPE Ethernet Link Guidelines, page 10-7
• Assigning a Global Profile to All LRE Ports, page 10-8
• Assigning a Profile to a Specific LRE Port, page 10-9
• Using Rate Selection to Automatically Assign Profiles, page 10-10
• LRE Link Persistence, page 10-14
• LRE Link Monitor, page 10-14