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Using DLSw Prioritization

303523-A Rev. 00

6-3

DLSw Priority Queues

This section describes how DLSw protocol prioritization works, and defines

DLSw terms.

Although similar to the existing circuit-level protocol prioritization, DLSw

prioritization is not limited to synchronous interfaces and does not operate at the

driver level. DLSw prioritization occurs before TCP sequences packets, where the

data link control (LLC2 or SDLC) and TCP function.

The router sorts packets into priority queues as described later in “The Enqueuing

Process.” The router then drains (dequeues) the priority queues to transmit packets

according to a weighted allocation algorithm, described later in “The Dequeuing

Process.”

Based on the needs of your site, you can configure up to ten queues for each

DLSw peer. You can create queues for traffic with specific MAC or SAP address

ranges or, for SNA traffic, based on criteria in the SNA transmission header (FID2

and FID4). You determine whether a queue applies to all DLSw peers or to one or

more specific configured peers.

Default and Peer-Specific DLSw Queues

To set the way the router handles priority queues for all DLSw traffic (including

unconfigured peers), you use the default DLSw queue configuration. To

customize the handling of queued traffic for a particular configured peer, you

configure peer-specific priority queues that apply to that peer’s IP address only.

The default priority queue configuration applies to all configured DLSw peers

except those individual peers for which you configure a custom priority queue.

Peer-specific queues take precedence over the default queue.

The Enqueuing Process

The router enqueues packets that match a DLSw priority filter as follows:

1. Applies filter rules

2. Stamps packets with a queue number

3. Places packets in appropriate queues

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Avaya Configuring DLSw Services Manual do Utilizador Página 215