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DLSw Implementation Notes

304233-A Rev. 00

2-15

Types of Protocol Prioritization

There are two separate implementations of protocol priority queuing. For all

synchronous protocols that support outbound traffic filters, Bay Networks

supports a high, normal, and low priority queue at the circuit interface level. For

inbound and outbound DLSw traffic, Bay Networks also supports one to 10

queues at the TCP level for DLSw peers.

Using existing protocol prioritization support, you can prioritize DLSw traffic

before other protocols. DLSw protocol prioritization gives preference to specific

types of DLSw traffic, such as:

•Ethernet

• Frame Relay

•SDLC

• Token Ring

• Other SRB traffic

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” on page 2-16

. The router then drains (dequeues) the priority queues to

transmit packets according to a weighted allocation algorithm, described later in

“The Dequeuing Process

” on page 2-17.

Note:

You can apply both circuit-level and TCP-level prioritization to DLSw

traffic. Note that TCP-level prioritization alone does not give DLSw traffic

precedence over other routing protocols. For information about circuit-level

prioritization, refer to Configuring Traffic Filters and Protocol Prioritization.

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Avaya Configuring DLSw Services Manual do Utilizador Página 71