Interpreting Local Statistics

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:

Ring (Ring Status)

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 (Entity Coordination Management)

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 (Ring Management)

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 (Physical Connection Management)

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.

Figure 2-1 Normal Sequence of PCM States

Ring_OP (Ring Operational)

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.

XmitP (Transmit Packets)

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.

RecvP (Receive Packets)

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.