Avaya Configuring ATM and MPLS Services Uživatelský manuál stáhnout pdf (Strana 53)

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Understanding ATM, MPOA, ATM Router Redundancy, and OAM

117374-C Rev 00

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Entering an ATM Address Network Prefix

The ATM address network prefix specifies the ATM domain of which the service

record is a part. This 13-byte portion of the ATM address can range from

XX000000000000000000000000 to XXFFFFFFFFFFFFFFFFFFFFFFFF.

The XX byte must contain a value of 39, 45, or 47. These values define the

authority and format identifier (AFI). The AFI byte identifies the group

responsible for allocating the prefix and the format the prefix uses. For more

information about the AFI byte, refer to the ATM Forum UNI specification.

Entering an ATM address network prefix is optional. If you do not enter a network

prefix in the specified range, the service record accepts the first prefix value that it

receives from the switch.

Entering an ATM Address User Part

The ATM address user part (suffix) consists of a 6-byte end-station identifier and a

1-byte selector field. This 7-byte portion of the ATM address can range from

00000000000000 to FEFFFFFFFFFFFF.

You can either allow the router to generate this value automatically, or you can

enter the value manually.

ATM Traffic Parameters

The ATM User-Network Interface Specification defines the following traffic

parameters:

• Peak cell rate (PCR) -- The upper traffic rate limit for an individual VC

• Sustainable cell rate (SCR) -- The upper bound on the conforming average

rate of an individual PVC or control VC

• Maximum burst size (MBS) -- The maximum length of a cell stream allowed

on a particular VC

These parameters help to prioritize and control the traffic on each VC. How you

configure your ATM traffic parameters depends on the characteristics of the

individual connections that you want to set up (for example, the desired maximum

cell rate, average cell rate, and burst size).

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