Chapter 4 Configuration Tables and Fields

Link Special Cases

Table 4-3 Link Table (continued)

Field

Defaults

Notes

Description and Comments

DBF

CET

TPI

 

 

 

 

 

 

 

AW

5040

O

Administrative weight used for least

AW

 

 

 

 

 

cost in the PNNI routing algorithm.

 

 

 

 

 

 

 

 

 

 

Comment

 

 

A free field comment field. Translates

COMMENT

Not available

The comment

 

 

 

to the WANDL link label field if

 

until sv+ Release

field is used as the

 

 

 

present.

 

9.0.

link label in the

 

 

 

 

 

 

bblink file. If this

 

 

 

 

 

 

field is blank, a

 

 

 

 

 

 

link label will be

 

 

 

 

 

 

generated only if

 

 

 

 

 

 

it is required to

 

 

 

 

 

 

uniquely

 

 

 

 

 

 

determine the link

 

 

 

 

 

 

in WANDL.

 

 

 

 

 

 

 

Link Special Cases

This section describes link table configuration for the following special cases:

•ATM Trunks

•Virtual Trunks

IMATM Trunks

An IMATM trunk is an ATM link of one to eight DS1 lines. Each IMATM trunk card uses a slot of an AXIS shelf, and is connected to the BPX switch by means of a T3/E3 port on a BNI card. The trunk can be configured so it fails only if more than n DS1 lines fail. The NMT does not model IMATM trunk resiliency during failure analysis.

Table 4-4 IMATM Trunk Configuration

Topic

Required Settings

Comments

 

 

 

Specifying an IMATM Trunk

Links table

Both sites must be BPX.

 

Trunk (type) field: Specify a trunk of

The IMA_RD field is on the

 

T1 or E1. Prepend the number of

second screen of the Links table.

 

DS1s for the trunk, for example 5:T1

 

 

or 8:E1.

 

 

Trunk (capacity) field: For E1 links,

 

 

specify number of DS0 in the line: 30

 

 

for CCS signalling or 32 for Clear

 

 

Channel signalling.

 

 

Trunk card field: Specify IMA for

 

 

both trunk front cards.

 

 

IMA_RD field: enter the resiliency

 

 

degree.

 

 

 

 

 

Cisco WAN Modeling Tools Guide

4-10

OL-10426-01, Rev. A0

Page 55 Page 57
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Cisco Systems OL-10426-01 Link Special Cases, Imatm Trunks, Specifying an Imatm Trunk, Links table, Both sites must be BPX
Page 55 Page 57

OL-10426-01 specifications

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