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Chapter 35: ERPS Commands
erps forced-switch
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
revertive
command.
E
XAMPLE
Console#erps clear domain r&d
Console#
This command blocks the specified ring port.
S
YNTAX
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.
C
M
OMMAND
ODE
Privileged Exec
C
U
OMMAND
SAGE
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:
The ring node where a forced switch command was issued blocks
a.
the traffic channel and R-APS channel on the ring port to which the
command was issued, and unblocks the other ring port.
The ring node where the forced switch command was issued
b.
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 35-2 on page
other ring nodes of the FS command and that the traffic channel is
blocked on one ring port.
A ring node accepting an R-APS (FS) message, without any local
c.
higher priority requests unblocks any blocked ring port. This action
subsequently unblocks the traffic channel over the RPL.
The ring node accepting an R-APS (FS) message, without any local
d.
higher priority requests stops transmission of R-APS messages.
The ring node receiving an R-APS (FS) message flushes its FDB.
e.
– 1071 –
1072). The R-APS (FS) message informs
non-
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