Thrash Limiting - Allied Telesis SwitchBlade x908 Series Software Reference Manual

Configuration
To enable loop protection and configure its basic parameters, you use the
command on page
To enable the loop-detect mechanism, and generate loop-detect frames once every 5 seconds,
Example
use the command:
Note:
You can now use the
that the switch will take if a loop is detected.
To disable an interface, and bring the link down, when a network loop is detected, use the
Example
command:
Now decide how long you want the protective action to apply for. You configure this function
by using the
Example To configure a loop protection action timeout of 10 seconds, use the command:

Thrash Limiting

MAC address thrashing occurs when MAC addresses move rapidly between one or more
ports or trunks, for example, due to a network loop.
Thrash limiting enables you to apply actions to a port when thrashing is detected. It is
supported on all port types and also on aggregated ports.
Limiting
There are several different thrash actions that you can apply to a port when thrashing is
Actions detected. These actions are:
■
■
■
■
When a MAC address is thrashing between two ports, one of these ports (the first to cross its
thrashing threshold) is disabled. All other ports on the device will then have their threshold
counters reset.
C613-50007-01 REV B
15.9.
awplus(config) #
LDFs are sent sequentially for each VLAN defined to a particular port. For example,
if a particular port in this example is a member of 4 VLANs, then the LDFs will be
sent from this port at the rate of 4 frames every 5 seconds.
loop-protection action command on page 15.10
awplus(config-if)#
loop-protection timeout command on page
awplus(config)#
learnDisable
Address learning is temporarily disabled on the port.
portDisable
The port is logically disabled. Traffic flow is prevented, but the link remains up. The device
at the other end does not notice that the port has changed status, and the link LEDs at
both ends stay on.
linkDown
The port is physically disabled and the link is down. This is equivalent to entering the
shutdown command on page
vlanDisable
The port is disabled only for the VLAN on which thrashing has occurred. It can still receive
and transmit traffic for any other VLANs of which it is a member.
Software Reference for SwitchBlade® x908, x900 and x600 Series Switches
TM
AlliedWare Plus Operating System - Software Version 5.3.1
loop-protection loop-detect ldf-interval 5
loop-protection action link-down
15.11.
loop-protection timeout 10
12.7.
Switching Introduction
loop-protection
configure the action
14.15