Allied Telesis AT-8600, RAPIER I, X900-48FE QoS Enhancements, Port Groups, Software Version 125

Software Version 2.8.1 125

QoS Enhancements

This Software Version includes the following enhancements to Quality of

Service:

■Port Groups

■Storm protection

This section describes the enhancements. The new and modified commands to implement them are described in Command Reference Updates.

Port Groups

This enhancement introduces eight new commands and modifies two existing show commands for the AT-8948, x900-48, and AT-9900 switches.

A port group is a set of ports you have collected together so that QoS can process them as a single entity. Typically, you create port groups and then assign a policy to a group. When you do this, only one instance of the policy is created. Traffic arriving via members of the port group is then processed by that policy. If port groups are not used, when the policy is applied to multiple ports, the policy’s configuration is copied and duplicated as multiple policies in hardware.

The distinction between multiple, different instances of a policy separately attached to each port, and a single instance attached collectively to ports is especially important for metering. Metering marks packets with a bandwidth class number that indicates whether the packet is within specific bandwidth limits. Downstream QoS processes then determine how to handle the packets, depending on their respective bandwidth class. For individual ports, the metering process separately measures the data rate coming into each port. However, with port groups, metering collectively measures the total data rate coming into members of the group.

A single port scenario is suitable for multiple unit situations, such as hotels, where each port connects to a separate end-user, and you want to separately meter data for each end-user. However, port groups are appropriate for enterprises where all ports on a switch are connected to a LAN owned by one customer. The goal is to measure the combined traffic arriving at the switch over ports to which specific policies are assigned.

Note that a port group cannot span across switch instances.

To create one or more port groups or remove a group, use the commands:

create qos portgroup=group-list[port=port-list] [description=description]

destroy qos portgroup=group-list

To add ports or remove them from a port group, use the commands:

add qos portgroup port

delete qos portgroup port

To attach a policy to a port group or remove the current policy, use the command:

set qos portgroup

Software Version 2.8.1 C613-10477-00 REV B