Enterasys Networks 700 - Manual (Page 149)

Viewing FDDI Information 5-5
FDDI Management
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 DELHF-UA 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
DELHF-UA 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 DELHF-UA 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 DELHF-UA, 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.