Enterasys SmartSwitch 6000, User Manual

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Viewing FDDI Information 6-5
FDDI Management
frames (from other issuing stations) and either continues its own bid (and removes the
competing Claim Frame from the ring) or defers (halts transmission of its own bid and
repeats the competing bid) according to the following hierarchy of arbitration:
• A Claim Frame with the lowest TTRT bid has precedence.
• If the values of TTRT are equal, the frame with the longest source address (48 vs. 16
bits) has precedence.
• If both TTRT value and source address length are equal, the frame with the highest
address has precedence.
The HSIM-F6 is shipped with a default T-Req of 6 msec. T-Req is stored within the MIB
in units of nanoseconds (one billionth of a second) rather than milliseconds (one
thousandth of a second); NetSight Element Manager converts nanoseconds to
milliseconds for display purposes. You can use any SNMP Set Request tool to edit the
T-Req value; just remember that you must enter your value in nanoseconds, rather than
milliseconds.
T-Neg. (Negotiated)
The winning time negotiated in the ring initialization sequence.
Concentrator M Ports
This field displays the number of Master (M) ports on the device that are associated with
the selected SMT entity. A Master port is a port that provides a connection for Single
Attachment Station (SAS) devices to the FDDI network. The HSIM-F6 does not support
M ports, so this field will always display 0.
Concentrator Non-M Ports
This field display the number of non-Master ports (A, B, or S ports) on the device that are
associated with the selected SMT entity. As each HSIM-F6 module has a single A /B port
pair supporting a single ring (and, therefore, a single SMT entity), this field will display 1.
Number of MACs
The number of Media Access Control entities present on the device associated with the
selected SMT entity. For the HSIM-F6, this number will be 1.
MAC Path
Indicates the configuration of the MAC in respect to the logical ring, as determined by the
Connection Management (CMT) portion of SMT. CMT controls the establishment of a
media attachment to the FDDI network, the connections with other nodes in the ring, and
the internal configuration of the various entities within a node. CMT provides the link
confidence test, and specifies a Link Error Monitor (LEM) which monitors active links on
a per-link basis to ensure that failing links are detected and, if required, removed from the
network. Possible values are:
• Primary indicates that the MAC is inserted into the primary path of the currently used
FNB ring.
• Secondary indicates that the MAC is inserted into the secondary path of the currently
used FNB ring.