ECM shows the current state of the Entity Coordination Management state machine, which controls the following features and facilities:
Media availability
Trace
Path Test
Optical Bypass (optional)
Hold Policy (optional)
Table 2-1 lists the states that may be returned by pf_stat under the ECM heading.
Table 2-1 pf_stat States Under the ECM Heading
State |
Meaning |
OUT |
ECM is inactive and is waiting for a connect request (initial state). |
IN |
ECM is active; normal state after successful connection request. |
TRACE |
ECM is propagating a trace request to the appropriate entity. |
LEAVE |
ECM is closing all connections prior to the station leaving the ring. |
PATH_TEST |
ECM is entering a path test state following trace completion. |
INSERT |
ECM is sending a request to the optical bypass switch to indicate that the station is entering the ring. This disengages the switch. |
CHECK |
ECM is verifying that symbols are being received from the network. |
DEINSERT |
ECM is sending a request to the optical bypass switch, to indicate that the station is leaving the ring. This engages the switch. |