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34 Using Enterprise Edge Services

Enterprise Edge Networking Operations Guide P0910464 Issue 01

If you specify Queue 0 and a TOS bits for a filter, then this TOS takes

precedence over the TOS set for premium traffic for all packets that match this

filter.

The default TOS for all best-effort packets is 0x00, and the default queue for

best-effort packets is Queue 5.

Consider the following guidelines when you set up priority filters

• The fewer the conditions to check for, the fewer CPU cycles are consumed.

Filter processing is faster if fewer conditions are specified, without

compromising the precision in selection.

• If you don’t need the value of a particular criterion, such as source port number,

don’t set a corresponding value for the filter.

• When you specify the layer 3 sub-protocols, use the port number/IP address

combinations and avoid specifying the protocol field. Nortel Networks

recommends that you specify a protocol field only if you manage an unusual

condition in your network. This reduces the consumption of CPU cycles.

• Users can configure the precedence of the filters. Packets are matched against

each filter sequentially until a match is found. Pay attention when specifying the

precedence of filters. Placing ‘popular’ filters ahead of ‘unpopular’ filters can

significantly speed up the processing.

WARNING

Premium flows that are specified by priority are not admission controlled. Unless

you know the behavioral characteristics of a flow, do not specify flows as premium.

Instead, you can specify them as the highest B-E traffic.

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Avaya EE Networking Guida Utente Pagina 34