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ATM Protocol Prioritization and Priority Queuing

308645-15.0 Rev 00

9-13

Direct PVCs and SVCs

For direct PVCs and SVCs, priority queuing is applied at the VC level since there

is only one VC per service record.

Data coming from applications, such as LANE and IP over ATM, is passed to

outbound traffic filtering and protocol prioritization (Figure 9-6). At this stage

user-defined filters are applied to the data packets and the packets are processed

accordingly. You can configure packets matching a filter to be dropped, logged, or

accepted, depending on the specified filtering actions, or to be prioritized into one

of the priority queues depending on the type of traffic specified in the filter

criteria. For more information on filter actions and filter criteria, see Chapter 4.

Data from each VC is treated differently. That is, filtering and queuing of data is

performed on each VC independently of the filtering and queuing performed on

the data in other VCs.

As shown in Figure 9-6, different priority queues (Hi, Normal and Low) are

maintained for each VC. Filter tables are different for each service record and VC.

After dequeuing the data from the queue, the data goes to the ATM driver which

finally passes the data to the ATM adaptation layer (AAL). For more information

on queuing and dequeuing, see Chapter 2.

Per-service priority queuing in the case of direct PVCs and SVCs is same as

per-VC priority queuing. Statistics are maintained on a per-service basis and

reflect the statistics of the VC.

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Avaya Configuring Traffic Filters and Protocol Prioritization Manuel d'utilisateur Page 167