Port Fencing - Brocade Communications Systems 1606 Administrator's Manual
Brocade fabric watch administrator's guide v6.3.0 (53-1001342-01, july 2009)
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Also See for 1606:
- Command reference manual (988 pages) ,
- Reference (792 pages) ,
- Administrator's manual (592 pages)
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1
Port fencing
Port fencing
A port that is consistently unstable can harm the responsiveness and stability of the entire fabric
and diminish the ability of the management platform to control and monitor the switches within the
fabric. Port Fencing is a Fabric Watch enhancement that takes the Port class, E_Port class, and
F/FL_Port class ports offline if the user-defined thresholds are exceeded.
NOTE
Port Fencing is not enabled by default. You must manually enable Port Fencing. Refer to Appendix
D,
"Port fencing types"
M-EOS and Fabric OS v6.3.0.
When a port that has exceeded its user-defined thresholds is fenced by software, the port is placed
into the disabled state and held offline, thereby removing the port's ability to transmit or receive
frames. After a port is disabled, user intervention is necessary for frame traffic to resume on the
port.
Active or online ports with Invalid Transmission Word (ITW) errors, CRC errors, or Link Reset (LR)
errors that exceed the threshold are fenced after a six-second delay. In cases where two types of
errors occur within the six-second interval, the port is disabled and indicates the reason code for
the first error type that exceeded the threshold.
Port fencing and link reset monitoring
Link reset monitoring is used to recover from link timeout errors, when a port may not know the
status of the opposite port on the link. Large numbers of link resets indicate hardware problems,
which can be disruptive for the entire switch or fabric. To protect the switch and fabric from
experiencing fabric reconfiguration and traffic disruption caused by a single port, you can use port
fencing to fence off the port on which link resets exceed a specified threshold limit.
With port fencing, you can:
•
•
Refer to
6
on page 111 for a complete set of port fencing types that are available in
Set threshold values for link reset errors.
Configure alarms, boundary levels, and the threshold type for link reset errors.
Chapter 7, "Port fencing"
for instructions on how to configure port fencing.
Fabric Watch Administrator's Guide
53-1001342-01
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