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Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide
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Chapter 13 Configuring LRE
Configuring LRE Ports
Beginning in privileged EXEC mode, follow these steps to assign a margin to a specific LRE port:
To return to the default values, use the no margin {downstream | upstream} interface configuration
command.
Note The margin command is effective with any profile, but only with rate selection and only when a link is
being activated.
Configuring LRE Link Persistence
If the LRE link shuts down and is automatically re-enabled quickly, the switch configuration might
change. For example, the dynamic MAC addresses are removed from the MAC address table. You can
use the link persistence feature to configure a delay duration on the Catalyst 2950 LRE switch of up to
20 seconds before link failure is reported.
Beginning in privileged EXEC mode, follow these steps to set the delay duration on a specific LRE port:
To return to the default value, use the no persistence interface configuration command.
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
interface interface-id Enter the number of the LRE port to be configured, and enter
interface configuration mode.
Step 3
margin {downstream value | upstream value} Enter the downstream or upstream margin value (in dB). For the
values, see Table 13-6 on page 13-16, Table 13-7 on page 13-17,
Table 13-8 on page 13-18, and Table 13-9 on page 13-18.
Step 4
end Return to privileged EXEC mode.
Step 5
show controllers lre profile details Verify the change.
Step 6
copy running-config startup-config (Optional) Save your entries in the configuration file.
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
interface interface-id Specify the LRE port to be configured, and enter interface
configuration mode.
Step 3
persistence delay Enter the length of time (in seconds) for the delay duration. The
default is 3 seconds. The range is 1 to 20 seconds.
Step 4
end Return to privileged EXEC mode.
Step 5
show controllers lre status persistence Verify the change.
Step 6
copy running-config startup-config (Optional) Save your entries in the configuration file.