Cpe Ethernet Links - Cisco Catalyst 2950 Software Configuration Manual

Understanding LRE Features
Table 12-4 LRE Rate Selection Sequences for the Catalyst 2950ST-24 LRE 997 Switches
LRE-SEQ- LRE-SEQ-
COMPLETE-REACH DOWNSTREAM LRE-SEQ-SYM
LRE-12-9 LRE-12-9
LRE-12-3 LRE-12-3
LRE-9 LRE-9
LRE-9-6 LRE-9-6
LRE-9-4 LRE-9-4
LRE-6 LRE-9-3
LRE-6-4 LRE-6
LRE-9-3 LRE-6-4
LRE-4 LRE-6-3
LRE-6-3 LRE-4
LRE-4-3 LRE-4-3
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
Profiles" section on page

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.
From the CLI, you can configure and monitor the Ethernet link on a Cisco 575 LRE CPE and the
Note
Cisco 585 LRE CPE. You can configure and monitor the Ethernet link on a Cisco 576 LRE 997 CPE only
from the CLI. For information about the switch LEDs, see the Catalyst 2950 Desktop Switch Hardware
Installation Guide.
Keep these considerations in mind when you have CPE devices connected to the LRE ports:
•
•
Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide
12-6
LRE-9
LRE-6
LRE-4
12-14.
Use the shutdown interface configuration command to disable the LRE interface transmitter on any
LRE ports. 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.
LRE-SEQ-SYM- LRE-SEQ-
LONGREACH UPSTREAM
LRE-6-4 LRE-12-9
LRE-4 LRE-9
LRE-9-3 LRE-9-6
LRE-6-3 LRE-6
LRE-4-3 LRE-9-4
LRE-6-4
LRE-4
LRE-12-3
LRE-9-3
LRE-6-3
LRE-4-3
"Using Rate Selection to Automatically Assign
Chapter 12 Configuring LRE
LRE-SEQ-
VIDEO-TRANSMIT1
LRE-12-9
LRE-9
LRE-9-6
LRE-9-4
LRE-9-3
78-11380-12