Running the pf_stat utility without the -m option displays information about the various SMT state machines and the network to which the local station is attached:
The Ring status shows the current state of the physical connection to the FDDI network. The following states may be returned by pf_stat under the Ring heading
UP-SunFDDI interface physically connected to the active network
DOWN-SunFDDI interface disconnected, or connected to the inactive network
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. |
RMT shows the current state of the Ring Management state machine, which controls the following features and facilities:
MAC availability
Detection and resolution of duplicate addresses
Identification of stuck beacon and initiation of trace
Table 2-2 lists the states that may be returned by pf_stat under the RMT heading.
Table 2-2 pf_stat States Under the RMT Heading
State |
Meaning |
ISOLATED |
RMT is inactive (initial state). |
NON_OP |
RMT is waiting for an operational ring. |
RING_OP |
RMT is operating normally. |
DETECT |
RMT is checking for duplicate addresses (transient state during initialization). |
NON_OP_DUP |
RMT has detected that its address is duplicated and is initiating recovery. The ring is not operational in this state. |
RING_OP_DUP |
RMT has detected that the MAC address is duplicated and flagged the error. The ring is operational in this state. |
DIRECTED |
RMT has been beaconing for an extended period of time and is transmitting a stream of directed beacons prior to initiating recovery. |
TRACE |
RMT has initiated a trace to recover a stuck beacon. |
PCM shows the current state of the Physical Connection Management state machine that controls the following features and facilities:
Connection initialization
Maintenance support
This heading is modified to indicate the type of port that is being managed:
PCMS: single-attached station, S-port
PCMA: dual-attached station, A-port
PCMB: dual-attached station, B-port
TABLE 2-3 lists the states that may be returned by pf_stat under the PCM heading.
Table 2-3 pf_stat States Under the PCM Heading
State |
Meaning |
OFF |
PCM is inactive (initial state). |
BREAK |
PCM is starting the connection synchronization phase. |
CONNECT |
PCM is synchronizing the connection end-points prior to the signaling sequence. |
NEXT |
PCM is transmitting PDUs prior to entering SIGNAL state. |
SIGNAL |
PCM is transmitting and receiving signal bits (information) following a NEXT state. |
JOIN |
First state in the sequence leading to a synchronized connection. |
VERIFY |
Second state in the sequence leading to a synchronized connection. |
ACTIVE |
Final state indicating that the port is successfully incorporated in the token path. |
TRACE |
PCM is localizing a stuck beacon condition. |
The normal sequence of PCM states leading to a fully synchronized connection and incorporation of the port into the token path is shown in Figure 2-1. Note that the minimum interval between interrogations is one second and that this is not always fast enough to recover and display the complete sequence of PCM states.
Ring_OP shows the number of Ring_OP (Ring Operational) signals received. This signal is generated when the station is incorporated into an operational network.
Running pf_stat without an interval and count, displays the total number of packets transmitted since the interface was activated. Running pf_stat with an interval and count, displays the number of packets transmitted since the last interrogation.
Running pf_stat without an interval and count displays the total number of packets received since the interface was activated. Running pf_stat with an interval and count displays the number of packets received since the last interrogation.