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Alteon OS Application Guide
140
Chapter 7: Quality of Service 42C4911, January 2007
802.1p Configuration Example
1. Configure a port’s default 802.1p priority.
2. Map the 802.1p priority value to a COS queue and set the COS queue scheduling weight.
Queuing and Scheduling
The GbESM has eight output Class of Service (COS) queues per port, into which each packet
is placed. Each packet’s 802.1p priority determines its COS queue, except when an ACL action
sets the COS queue of the packet.
Each COS queue uses Weighted Round Robin (WRR) scheduling, with user configurable
weight from 1 to 15. The weight of 0 (zero) indicates strict priority, which might starve the low
priority queues.
You can configure the following attributes for COS queues:
Map 802.1p priority value to a COS queue
Define the scheduling weight of each COS queue
Use the 802.1p menu (/cfg/qos/8021p) to configure COS queues.
>> Main# cfg/port EXT1 (Select port)
>> Port EXT1# 8021ppri (Set port’s default 802.1p priority)
Current 802.1p priority: 0
Enter new 802.1p priority [0-7]: 1
>> Port EXT1# ena
>> Port EXT1# apply
>> Main# cfg/qos/8021p (Select 802.1p menu)
>> 802.1p# priq (Set COS queue assignments)
Enter priority [0-7]: 1
Current COS queue (for priority 1): 0
Enter new COS queue (for priority 1) [0-1]: 1
>> 802.1p# qweight (Set COS queue weights)
Enter COS queue [0-1]: 1
Current weight (for COS queue 1): 3
Enter new weight (for COS queue 1) [0-15]: 10
>> 802.1p# apply