User guide

Classifier command reference QOS

7-17

iMG/RG Software Reference Manual (Quality of Service)

• high priority packets would be dropped, because such a large number of buffers are queued from transmis-

sion that system buffering resources are exhausted.

The ADSL driver provides the following features to prevent this:

• Transmit scheduling

• Queue depth limiting

7.1.4.2.1 Transmit scheduling

The ADSL driver can be configured to support two transmit queues per VC; a high priority queue, and a low

priority queue. Packets are placed on a queue indicated by the traffic class field of the buffer.

Note: Whenever a transmit slot becomes available, a packet is sent from the high priority queue. If there are no

high priority packets available, a packet from the low priority queue is sent instead.

7.1.4.3 Configuring priority handling support

To enable support for different priorities on an existing ATM transport, use the following CLI commands:

pppoe set transport mypppoe prilevels 2

pppoa set transport mypppoa prilevels 2

rfc1483 set transport myrfc prilevels 2

These commands set two priority levels, as supported by the adsl driver.

Note: Note that packets classified as priority 0 will be placed on the default queue, packets classified as priority

1 or higher will all be placed on the high priority queue.

7.1.5 Classifier command reference

7.1.5.1 Classifier CLI commands

The table below lists the classifier commands provided by the CLI:

TABLE 7-1 Classifier commands

Commands

Fiber

Modular

ADSL

CLASSIFIER ADD PROFILE XXXXX X X X X

CLASSIFIER CLEAR PROFILES XXXXX X X X X

CLASSIFIER DELETE PROFILE XXXXX X X X X

CLASSIFIER LIST PROFILES XXXXX X X X X