Supermicro SSE-G2252, Руководство пользователя

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Chapter 35: ERPS Commands
– 1073 –
When performing a maintenance procedure (e.g., replacing, upgrading)
on a ring node (or a ring link), it is recommended that FS commands be
issued at the two adjacent ring nodes instead of directly issuing a FS
command at the ring node under maintenance in order to avoid falling
into the above mentioned unrecoverable situation.
E
XAMPLE
Console#erps forced-switch domain r&d west
Console#
erps manual-switch
This command blocks the specified ring port, in the absence of a failure or
an erps forced-switch command.
S
YNTAX
erps manual-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
OMMAND
M
ODE
Privileged Exec
C
OMMAND
U
SAGE
•
A ring with no 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 manual-switch command triggers protection
switching as follows:
a.
If no other higher priority commands exist, the ring node, where a
manual 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.
If no other higher priority commands exist, the ring node where the
manual switch command was issued transmits R-APS messages
over both ring ports indicating MS. R-APS (MS) message are
continuously transmitted by this ring node while the local MS
command is the ring node’s highest priority command (see
Table 35-2 on page 1072 ). The R-APS (MS) message informs other
ring nodes of the MS command and that the traffic channel is
blocked on one ring port.
c.
If no other higher priority commands exist and assuming the ring
node was in Idle state before the manual switch command was
issued, the ring node flushes its local FDB.
d.
A ring node accepting an R-APS (MS) message, without any local
higher priority requests unblocks any blocked ring port which does