C
HAPTER
34
| ERPS Commands
– 1109 –
â—† Recovery for forced switching under revertive and non-revertive mode
is described under the Command Usage section for the non-revertive
command.
â—† When a ring is under an FS condition, and the node at which an FS
command was issued is removed or fails, the ring remains in FS state
because the FS command can only be cleared at node where the FS
command was issued. This results in an unrecoverable FS condition.
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.
EXAMPLE
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.
SYNTAX
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.
R-APS (FS) remote |
local SF
*
local |
local clear SF local |
R-APS (SF) remote |
R-APS (MS) remote |
MS local |
WTR Expires local |
WTR Running local |
WTB Expires local |
WTB Running local |
R-APS (NR, RB) remote |
R-APS (NR) remote lowest
* If an Ethernet Ring Node is in the Forced Switch state, local SF is ignored.
Table 128: ERPS Request/State Priority (Continued)
Request / State and Status Type Priority
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