Cabletron Systems 6A000 User Manual

4-6 SmartCell 6A000 User Guide

ATM Routing

Switch Administration

4.2.3

Route Metrics

Route metrics are assigned to routes using a metric tag (one of the input parameters for

add ATMRoute

). The metric tag

specifies a particular pair of incoming and outgoing metrics contained within a list of metrics. Metrics are created using
the

add PNNIMetric

command. Each metric pair specifies a set of values that describe a route’s Service Category, cell

rates, bandwidth, and administrative weight. Locally, metric values determine the behavior of the link, while
network-wide, PNNI’s Generic Call Admission Control (GCAC) assesses metrics when establishing calls.

In the following example, a metric pair is created (with metric tag of nine) that specifies CBR as the Service Category,
administrative weight of 200, Max Cell Rate of 1000 cells per second, and an Available Cell Rate of 750 cells per
second.

First, we create the outgoing member of the metric pair:

SmartCell ZX # add pnnimetrics

MetricsTag(1) : 9

TrafficDirection(Outgoing) :

< 1st pair member, we accept the default

ServiceCategory(UBR) : cbr

GCAC_CLP(2) :

AdminWeight(5040) : 200

MaxCellRate(-1) : 1000

AvailableCellRate(-1) : 750

MaximumCellTransferDelay(-1) :

CellDelayVariation(-1) :

CellLossRatioForCLP=0(-1) :

CellLossRatioForCLP=0+1(-1) :

CellRateMargin(-1) :

VarianceFactor(-1) :

Next, we create the incoming member of the metric pair: