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Chapter 5 71

Troubleshooting

Using the fddilink Utility

• CFM describes the internal conﬁguration of ports and MACs within a

station or concentrator. The CFM state can be one of the following:

• WRAP_A, WRAP_B, WRAP_AB, C_WRAP_A, and C_WRAP_B

states indicate that there is only a single data ring. Data for the

ring is transmitted and received through the same port (A or B).

• For an Single Attached Station where the A or B port is attached

to the M port of an FDDI device (such as a concentrator),

C_WRAP_A or C_WRAP_B is the normal operating state,

depending on the port used.

• In dual homing mode (connecting the station to two

concentrators), C_WRAP_B is the normal state. (Since port B is

usually the active port, port A would be in standby mode.)

• For a Dual Attached Station, the normal state is THRU. A wrap

state usually indicates that the dual ring is wrapped (a failure was

detected and a surrounding node is “wrapping” and using either

the A or B port to send and receive data). The wrap state can also

be a transitory startup state indicating that the A or B port is

ready to be incorporated into the ring.

• The ISOLATED state indicates that there is no internal

connection between the Media Access Control (MAC) and Physical

Layer Protocol (PHY) modules. Usually, this means that the card

is not cabled to the ring.

Refer to the CF_State variable description in the ANSI FDDI/SMT

speciﬁcation for more details.

• RMT indicates Ring Management (RMT) status information from the

MAC and CFM. The RMT state can be one of the following:

• ISOLATED is the initial state.

• NON_OP indicates that the ring is not operational.

• RING_OP indicates that the ring is operational.

• DETECT indicates that a duplicate address was detected,

rendering the ring non-operational.

• NON_OP_DUP indicates the ring is not operational because this

MAC has a duplicate address.

• RING_OP_DUP indicates that this MAC has a duplicate address.