Cabletron Systems SmartCell ZX-250, User Manual

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4-6 SmartCell ZX-250 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:
SmartCell ZX # 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) :
SmartCell ZX #