Management and Configuration Guide K/KA/KB.15.15

Table 31 General transceiver information (continued)
DescriptionParameter
50um multimode fiber. If the transceiver supports multiple transfer media, the
values are separated by a comma.
Shows whether the transceiver supports diagnostics:Diagnostic Support
None Supported
DOM Supported
VCT Supported
Serial number of the transceiverSerial Number
Link up or downLink Status
Speed of transceiver in MbpsSpeed
Type of duplexingDuplex
Values are OK, Open, Short, or ImpedanceCable Status
The distance in meters to a cable fault (accuracy is +/- 2 meters); displays 0
(zero) if there is no fault
Distance to Fault
Difference in propagation between the fastest and slowest wire pairsPair Skew
Signals on a wire pair are polarized, with one wire carrying the positive signal
and one carrying the negative signal.
Pair Polarity
The MDI crossover status of the two wire pairs (1&2, 3&6, 4&5, 7&8), will be
either MDI or MDIX
MDI Mode
Viewing transceiver information for copper transceivers with VCT support
This feature provides the ability to view diagnostic monitoring information for copper transceivers
with Virtual Cable Test (VCT) support. The cable quality of the copper cables connected between
transceivers can be ascertained using the transceiver cable diagnostics. Results of the diagnostics
are displayed with the appropriate CLI show commands and with SNMP using the hpicfTransceiver
MIB.
The J8177C 1000Base-T Mini-GBIC is supported.
Mitigating flapping transceivers
In traditional HP switches, the state of a link is driven directly by the reported state of the port,
which is required for rapid detection of link faults. However, the consequence of this is that a
marginal transceiver, optical, or wire cabling, one that "flaps" up and down several times per
second, can cause STP and other protocols to react poorly, resulting in a network outage. The
link-flap option expands the functionality of the existing fault finder function to include a "link-flap"
event and a new action of "warn-and-disable." Together, these additions allow the errant condition
to be detected, and the port in question can be optionally disabled.
Syntax
fault-finder link-flap sensitivity low | medium | high
action [ warn | warn-and-disable ]
Default settings: Sensitivity=Medium; Action = Warn
Sensitivity thresholds are static. In a 10-second window, if more than the threshold number of link
state transitions (up or down) are detected, the event is triggered. The 10-second window is statically
determined, that is, the counters are reset every 10 seconds, as opposed to being a sliding window.
Transceiver information 457