3Com 4007 Release Note - page 22
22
C
HAPTER
2: R
ELEASE
H
IGHLIGHTS
Information Display
From the
ethernet monitoring
menu, the
summary
option provides a
display of information.
Some fields, such as
portNumber
,
portLabel
, and various error counter
fields, are repeated from the
ethernet detail
display for your
convenience if you are troubleshooting.
However, there are three new fields:
„
monitorMode
— Displays the current setting from the
ethernet
monitoring mode
option (
disabled, enabled,
or
advanced
).
„
monitorStatus
— Indicates the status of Port Monitoring or
Advanced Autonegotiation on the port. There are three possible
entries in this field:
„
Normal
— The port state has not been modified.
„
Advanced
— The port has been forced into the full duplex state.
„
Partitioned
— The port is temporarily disabled. (The word
“partitioned” also appears in the
portState
field in the
ethernet
summary
and
ethernet detail
displays.)
„
MonitorErrors
– Indicates the number of times that the port has
transitioned into the partitioned state.
Important
Considerations
„
The initial time period in which a port is partitioned (disabled) is 30
seconds. When the system reenables the port, it also immediately
monitors the error conditions. If the error threshold is reached again,
the port is partitioned again. The time that the port is partitioned
increases with each incidence, up to a maximum of 5 minutes.
„
The error thresholds are fixed in system software; they are not
user-configurable.
„
Partitioned ports are disabled at the link level. That is, both the PHY
and MAC components are shut down so that the switch no longer
forwards traffic to that port. This action is taken for the following
reasons:
„
It prevents a switch from being congested due to the condition
known as “head-of-line blocking”
„
It allows resilient link connections (see the
bridge link
menu) to
switchover and thus minimizes network disruption
„
The attached device may self-heal during renegotiation or reboot