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Viewing MCPU
Configuration
Information
Configuring MCPU
Shapers
To view configuration information for the management CPU:
From the MCPU Configuration menu, select [1] Card Configuration to open the
Management Processor Configuration screen. This screen displays the following
CPU configuration information:
Hardware revision
Serial number
Status (In Service or Out of Service)
Typically, ATM network users purchase service at certain data rates and agree not
to transmit cells above certain thresholds into the ATM network. ATM network
providers, on the other hand, are responsible for ensuring that users do not
exceed these subscribed bandwidth levels. Network providers can use shapers to
ensure conformance to the traffic contract.
The PathBuilder S330/S310 switch supports three MCPU shaper parameters:
Peak Cell Rate (PCR) — The number of cells per second a given port will
accept from the port subscriber. Since it is not intuitive to think about cell
streams over a given period, however, you can think of the PCR as the
minimum amount of time acceptable between successive cells.
Sustained Cell Rate (SCR) — The average value of bandwidth utilization over
some predetermined time—the average rate at which cells may be sent to the
PathBuilder S330/S310 switch. The SCR is used in conjunction with maximum
burst size(MBS).
Maximum Burst Size (MBS) — The maximum number of cells that can be
sent at the peak rate. You can also use the MBS to determine the actual length
of a PCR burst. MBS is used in conjunction with sustained cell rate (SCR).
Using the MCPU Shapers screen, shown later in this section in Figure 62, you can
configure up to 15 shapers. The values that you set for the shapers on this screen
are the values that are then available for the Shaper Number parameter that you
set when you configure certain types of virtual circuits. See "Common VIrtual
Circuit Parameters" later in this chapter for details.
How you configure the MCPU shapers depends on the type of service you have.
If you have a peak rate service:
Set the peak rate at the maximum allowable value.
Set the sustained cell rate at the same rate as the peak rate.
If you have a sustained rate service:
Set the peak rate at the line rate (for example 45Mbps for a DS3 line).
Set the sustained cell rate and maximum burst rate at the values given to
you by your service provider.
CAUTION: When assigning shapers for VCM circuits, be sure that the shapers are
wider than the bandwidth used for the voice traffic.
Configuring the Management CPU
71
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