Cabletron Systems 9A100 manual Route Metrics

ATM Routing Switch Administration

4.2.3Route 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:

SmartSwitch # 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:

SmartSwitch # add pnnimetrics
MetricsTag(1)	: 9
TrafficDirection(Outgoing)	: incoming < 2nd pair member, we set as incoming
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)	:
SmartSwitch #

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