Multiple Instance Spanning-Tree Operation

Loop Protection

N o t e s

The receiver-actionoption can be configured on a per-port basis and can

 

only be enabled after loop protection has been enabled on the port. All

 

other configuration options (disable-timer,trap loop-detected, and transmit

 

interval) are global.

 

The trap option refers to a SNMP trap.

 

Regardless of how the receiver-actionand trap options are configured, all

 

detected loops will be logged in the switch’s event log.

 

The no loop-protect<port> command will not remove a receive-action

 

configuration line from the running configuration unless this option is set

 

to receive-action send-disable.

 

 

Viewing Loop Protection Status

To display information about ports with loop protection enabled, enter the show loop-protectcommand.

Syntax: show loop-protect <port-list>

Displays the loop protection status. If no ports are specified, the information is displayed only for the ports that have loop protection enabled.

For example:

ProCurve(config)# show loop-protect 1-4

Status and Counters - Loop Protection Information

Transmit Interval

(sec)

: 5

 

 

 

Port Disable Timer (sec) : 5

 

 

 

Loop Detected Trap

: Enabled

 

 

 

 

Loop

Loop

Loop

Time

Rx

Port

Port

Protection

Detected Count

Since Last Loop

Action

Status

----

-----------

--------- ---------- ----------------

------------

--------

1

Yes

No

0

 

send-disable

Up

2

Yes

No

0

 

send-disable

Up

3

Yes

No

0

 

send-disable

Up

4

Yes

No

0

 

send-disable

Up

Figure 4-30. Example of Show Loop-Protect Display

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