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IXP400 Software
Access-Layer Components: Ethernet Database (IxEthDB) API
April 2005 IXP400 Software Version 2.0 Programmer’s Guide
170 Document Number: 252539, Revision: 007
10.3.5.2 Receive Priority Queuing
Incoming frames will be classified into an internal traffic class, either by mapping the 802.1Q
priority field (if available) into an internal traffic class or by using the default traffic class
associated with the incoming port. The incoming frame will be placed on a receive queue
depending on its traffic class. Up to four traffic classes and associated queues are supported. Traffic
classes are ordered in their priority order, with 0 being the lowest priority.
Figure 56. QoS on Receive for 802.1Q Tagged Frames
Rx
EthDB
Incoming frame (802.1Q tagged)
Preamble Start frame Dest MAC addr Src MAC addr 0x8100 CFI VLAN ID Len Data Pad FCSPri
User priority: 0..7
User Priority Traffic class
0 2
1 0
7 3
Priority regeneration table
Traffic class 3 queue
Traffic class 2 queue
Traffic class 1 queue
Traffic class 0 queue
EthAcc
Traffic class queue selector