Lre Ethernet Links - Cisco WS-C2950-24 Configuration Manual

Chapter 7 Configuring the Switch Ports

LRE Ethernet Links

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• A configuration conflict occurs if a switch cluster has LRE switches using
both private and public profiles. If one LRE switch in a cluster is assigned a
public profile, all LRE switches in that cluster must have that same public
profile. Before you add an LRE switch to a cluster, make sure that you assign
it the same public profile used by other LRE switches in the cluster.
A cluster can have a mix of LRE switches using different private profiles.
For more information about clusters, see
Use the show controllers lre privileged EXEC commands to display the LRE link
statistics and profile information on the LRE ports. For information about these
commands, refer to the Catalyst 2900 Series XL and Catalyst 3500 Series XL
Command Reference.
The Ethernet link settings on the LRE ports are for configuring the remote CPE
Ethernet port, and they define the connection between the Ethernet port on the
Cisco 575 LRE CPE and an Ethernet device such as a PC or a television set-top
box. You can set the CPE Ethernet port to operate at 10 or 100 Mbps and at half-
or full-duplex mode, depending on the capability of the remote Ethernet device.
Autonegotiation for port speed and duplex mode is supported. The default speed
for the CPE Ethernet port is auto; the default duplex mode is half duplex.
When configuring the Ethernet link on the LRE ports, keep in mind the following
guidelines:
• The speeds on the LRE and Ethernet links do not need to match. However, to
prevent the possible loss of data when the LRE link is configured to be slower
than the Ethernet link, choose one of the following:
– Configure the LRE port to use half-duplex mode, which is the default.
Use duplex autonegotiation or full-duplex mode only if the remote
–
device supports 802.1x full-duplex flow control.
You cannot configure the flow control setting on the LRE ports. The
Note
flow control setting on the remote CPE Ethernet port is automatically
disabled on LRE ports in half-duplex mode, and is automatically
enabled on LRE ports in full-duplex mode.
The PC user should notice no significant difference in performance between
100-Mbps half duplex and 100-Mbps full duplex.
Catalyst 2900 Series XL and Catalyst 3500 Series XL Software Configuration Guide
Configuring the LRE Ports
Chapter 5, "Clustering Switches."
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