CLI Reference Guide-R04

Chapter 21 | ERPS Commands
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physical-ring Use this command to associate an ERPS instance with an existing physical ring. Use
the no form of the command to removed the association.
Syntax
physical-ring ring-name
no physical-ring
ring-name - Name of a specific ERPS ring. (Range: 1-12 characters)
Default Setting
None
Command Mode
ERPS Instance Configuration
Command Usage
The physical ring name must first be defined using the erps ring command.
Example
Console(config-erps-inst)#phyical-ring campus1
Console(config-erps-inst)#
erps forced-switch This command blocks the specified ring port.
Syntax
erps forced-switch instance instance-name {east | west}
instance-name - Name of a specific ERPS instance. (Range: 1-12 characters)
east - East ring port.
west - West ring port.
Command Mode
Privileged Exec
Command Usage
◆ A ring with no pending request has a logical topology with the traffic channel
blocked at the RPL and unblocked on all other ring links. In this situation, the
erps forced-switch command triggers protection switching as follows:
a. The ring node where a forced switch command was issued blocks the traffic
channel and R-APS channel on the ring port to which the command was
issued, and unblocks the other ring port.
b. The ring node where the forced switch command was issued transmits R-
APS messages indicating FS over both ring ports. R-APS (FS) messages are