CLI Reference Guide-R05

Chapter 18 | ERPS Commands
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Command Usage
◆ Two steps are required to make a ring operating in non-revertive mode return
to Idle state from forced switch or manual switch state:
1. Issue an erps clear command to remove the forced switch command on
the node where a local forced switch command is active.
2. Issue an erps clear command on the RPL owner node to trigger the
reversion.
◆ The erps clear command will also stop the WTR and WTB delay timers and
reset their values.
◆ More detailed information about using this command for non-revertive mode
is included under the Command Usage section for the non-revertive command.
Example
Console#erps clear domain r&d
Console#
erps forced-switch This command blocks the specified ring port.
Syntax
erps forced-switch [domain ring-name] {east | west}
ring-name - Name of a specific ERPS ring. (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
continuously transmitted by this ring node while the local FS command is
the ring node’s highest priority command (see Table 93 on page 513). The