Avaya Configuring Traffic Filters and Protocol Prioritization Uživatelský manuál stáhnout pdf (Strana 156)

Configuring Traffic Filters and Protocol Prioritization

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308645-15.0 Rev 00

To complete the procedures in this chapter, you must be familiar with outbound

traffic filter criteria and actions. See Chapter 4 for this information.

Interoperability of ATM Protocol Prioritization

Protocol prioritization (priority queuing) implemented for ATM services at the

driver/interface level enables you to prioritize traffic going out of an ATM

interface. Protocol prioritization implemented at the service record level enables

you to prioritize traffic going out of individual VCs. This section describes the

interoperability of ATM protocol prioritization at the interface and service levels.

Service record filters and prioritization are applied before interface filters and

prioritization. Service record filters and prioritization also are applied

independently of interface filters and prioritization. Be careful when applying

traffic filters at both the service record level and the interface level because a

packet that is prioritized as high at the service level, may be prioritized as low at

the interface level. In most cases, applying filters at either the interface or service

level provides adequate traffic management.

If you need to apply traffic filters only at the service record level, we recommend

that you also enable priority queuing at the interface level without applying filters,

so as to provide adequate buffers. If you do this, all data flows to the normal

priority queue and is de-queued from there and the buffer limit of the normal

priority queue eases the flow of data to the ATM driver.

When you enable priority queuing at both levels, you can override the interface

filters so that only the service record filters are applied. This feature is useful

when certain filter definitions satisfy the requirements of all except a few ATM

services. In these cases, you can define generic filters at the interface level, define

specific filters at the service record level for those few ATM services, and enable

the service record filter override. Thereafter, if a service record filter indicates that

a packet has high priority and priority queuing is enabled at both the service

record and interface levels, the interface filters are ignored and the service record

filters are applied at both levels.

Note:

For the Passport 5430, you can implement protocol prioritization at the

service record level only.

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Avaya Configuring Traffic Filters and Protocol Prioritization Uživatelský manuál Strana 156