ECS4110-28T_Management Guide

C HAPTER 36 | 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 140 on page 1142). The R-APS (FS) message informs