Allied Telesis AT-9800, RAPIER I, X900-48FE, AT-8900, AT-8700XL, AT-9900, AT-8600 Storm protection

126 QoS Enhancements Release Note

To enable QoS counters, use the command:

set switch enhancedmode=qoscounters

To reset traffic class counters for a port group, use the command:

reset qos portgroup counters trafficlass[={trafficclass-listall}]

To display information about port groups, use the commands:

show qos portgroup

show qos portgroup counters show qos port

Command Changes

The following table summarises the new and modified commands:

Command	Change
add qos portgroup port	New command
create qos policy	New command
delete qos portgroup port	New command
destroy qos portgroup	New command
reset qos portgroup counters	New command
set qos portgroup	New command
show qos portgroup	New command
show qos portgroup counters	New command
show qos policy	New Ports Assigned to parameter
	New Port Groups assigned to parameter
show qos port	New Port Group parameter
	New Trunk Group parameter

Storm protection

This Software Version includes an enhancement to Quality of Service (QoS) that allows storm protection.

Storm protection uses QoS mechanisms to classify on traffic likely to cause a packet storm (broadcast and multicast). With a per-port storm protection mechanism, any traffic over the configured limit is discarded. However, with QoS storm protection, several actions are possible when a storm is detected:

■You can disable the port physically.

■You can disable the port logically.

■You can disable the port for a particular VLAN.

Enhanced mode must be enabled with the set switch enhancedmode command in the Switching chapter before you can configure storm protection. When a storm is detected on a port, a message is automatically recorded in the log, and you can configure an SNMP trap to signal that a port has been disabled. When a storm is detected on a trunk or port group, the entire trunk or port group is disabled.

Software Version 2.8.1 C613-10477-00 REV B