Cisco WS-C2960S-24PD-L Software Guide - Page 219

Chapter 7 Configuring the Switch Ports Configuring the LRE Ports 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. You cannot configure the Ethernet links on a Cisco 585 LRE CPE. You can only monitor the Ethernet links on the Cisco 585 LRE CPE by using the show remote interfaces status user EXEC command. For information about the switch LEDs, see Table 2-8 on page 2-10 and the Catalyst 2900 Series XL Hardware Installation Guide. Keep these considerations in mind when you have CPEs connected to the LRE ports: • Enable CDP either globally on the LRE switch or on the specific LRE ports. • Use the lre shutdown interface configuration command to disable the LRE interface transmitter on any LRE ports that are not connected to a CPE. 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 CPEs 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. Considerations for Connected Cisco 575 LRE CPEs You can configure the Cisco 575 LRE 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 with back pressure. The speeds on the LRE links and CPE Ethernet links do not need to match. However, to prevent the possible loss of data when the LRE link is slower than the CPE Ethernet link, make sure that the CPE Ethernet port is set to half-duplex mode. Use duplex autonegotiation only if the remote device supports 802.1X full-duplex flow control. The PC user should notice no significant difference in performance between 100-Mbps half duplex and 100-Mbps full duplex. Use the duplex and speed interface configuration commands, respectively, to change the duplex and speed settings on the Cisco 575 LRE CPE Ethernet port. 78-6511-08 Catalyst 2900 Series XL and Catalyst 3500 Series XL Software Configuration Guide 7-21