Filter
Top Products
10-8
Catalyst 2950 Desktop Switch Software Configuration Guide
78-14982-01
Chapter10 Configuring LRE
Configuring LRE Ports
Note When the default speed is set to 10 or 100 Mbps with half duplex, the values set are the same. If the
remote values are 10 Mbps with full duplex, the Cisco 575 LRE CPE Ethernet port is profile
independent. All LRE profiles are set to be 10 Mbps with half duplex except for LRE-10 (the default),
which is set to 10 Mpbs with full duplex. For a setting of 100 Mbps with full duplex, the value is set to
100 Mbps with half duplex.
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 cpe duplex and cpe speed interface
configuration commands, respectively, to change the duplex and speed settings on the Cisco 575 LRE
CPE Ethernet port.
Considerations for Connected Cisco 585 LRE CPEs
You can configure the Cisco 585 LRE CPE Ethernet port speed and duplexing from the command line,
depending on the capability of the remote Ethernet device. Autonegotiation for CPE port speed and
duplex mode is supported.
The default speed for the CPE Ethernet ports is auto. The default duplex mode is half duplex at 100 Mbps
with back pressure.
You can enable or disable the CPE Ethernet ports on a per-port basis.
The loopback interface configuration command is not supported on the LRE ports. External loopback
on the LRE ports is also not supported. Connecting a CPE Ethernet port to another Ethernet port on the
same CPE device can create a loop. If this happens, the switch stops sending to the CPE device and
blocks Ethernet traffic coming from the CPE device.
Assigning a Global Profile to All LRE Ports
Global profiles are set on a switch-wide basis.
Port sequences, global sequences, and port profiles have priority over global profiles (see the
“Precedence” section on page 10-11 for a full discussion of rate selection precedence). If you assign a
global profile to the switch, it cannot over-ride any previously or subsequently set sequence port profile.
(For further information on sequence and profile precendence, see Guidelines for Using LRE Profiles,
page 10-7.)
Changes to the global profile settings are immediately put in effect, and the global mode automatically
becomes the active mode.
Beginning in privileged EXEC mode, follow these steps to assign a global profile to the LRE ports:
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
lre profile profile_name Enter the global profile name. Select from the list in Table 10-1.
Step 3
end Return to privileged EXEC mode.
Step 4
show controllers lre profile details Verify the change.