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Additional information about the last four LEDs in Table 5-8 is provided below.
WRAP LED
If the WRAP LED is on, a ring wrap condition exists on the hub. To determine
where the wrap has occurred, enter the show cfm command. This command
displays the Configuration Management (CFM) state of the dual ring inside the
hub. Table 5-9 defines the possible CFM states. A path in this definition
represents the segment of a logical ring that passes through a station.
Table 5-9. CFM State Values Displayed by the show cfm Command
CFM State
Definition
Wrap_a
The secondary path is wrapped to the A port.
Wrap_b
The primary path is wrapped to the B port.
Wrap_s
The primary path is wrapped to the S port.
C_wrap_a
The primary and secondary paths are joined internally to the
station and wrapped to the A port.
C_wrap_b
The primary and secondary paths are joined internally to the
station and wrapped to the B port.
C_wrap_s
The primary and secondary paths are joined internally to the
station and wrapped to the S port.
Isolated
The MAC or port is not inserted into any path.
Thru
The primary path enters the A port and emerges from the B
port. The secondary path enters the B port and emerges from
the A port. This is normal FDDI operation.
Not all wrap conditions activate the WRAP LED. The WRAP LED lights when
a wrap condition involves a peer-mode connection. A, B, and S ports are
considered peer ports, and any connection between two peer ports is a peer-
mode connection. (An S-to-S connection is the exception and is not considered
a peer-mode connection.)
Any connection of an A, B, or S port with an M port is a tree-mode connection.
When the wrap condition involves a port connected in tree mode (an M port),
the WRAP LED remains off.
Using the Hub
5-13
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