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Beta Draft Confidential
Configuring SPVCs
About SPVCs
ATM Services Configuration Guide for CBX 3500, CBX 500, GX 550, and B-STDX 9000
1/19/05
18-3
ATM SPVC Scalability
In earlier releases of Navis EMS-CBGX, the design for ATM-to-ATM SPVCs on the
CBX 500 and GX 550 was not scalable. Since the SPVCs use more resources than the
PVCs, the number of SPVCs that could be configured on a card was far less than the
number of PVCs that could be configured on the same card. If the SPVCs are
managed in the same way as the PVCs, then there can be an increase in the number of
SPVCs that can be configured on a card to match the same number of PVCs. The
combined total of PVCs and SPVCs supported in this release equals the total number
of PVCs supported in previous releases.
In this release Offnet Circuits support the ATM-to-ATM type of SPVCs. Prior to this
release Offnet Circuits supported only Frame Relay (FR)-to-FR, FR-to-ATM, and
ATM-to-FR types of SPVCs. ATM-to-ATM SPVCs are configured via the Offnet
Circuits node in the Navis EMS-CBGX switch tab.
ATM SPVC scalability is supported on all CBX 500 and GX 550 ATM cards: IOM1,
IOM4, IOM7, BIO1, BIO2, and BIO-C. It is also supported on the CBX 3500 4-Port
OC-3c/STM-1 card.
Using PVC/PVP Termination
Before you can configure SPVCs, you must first configure the SVC address or prefix
you want to assign to the SPVC terminating endpoint. This endpoint may not actually
terminate the SPVC. When you configure an SVC port address, you enable or disable
PVC/permanent virtual path (PVP) termination. If you disable termination, the egress
logical port signals the SPVC on as a regular SVC.
PVC and PVP termination enable you to send calls through the network to a non-SVC
endpoint, using an SVC.
shows the results of using PVC/PVP
termination.
As you configure PVC/PVP termination, consider the following:
•
If you enable PVC termination, you can optionally specify a VPI/VCI or allow the
SPVC originator or the network to choose a VPI/VCI. The switch terminates the
SPVCC on the logical port that is associated with the VPI/VCI, and the traffic
then continues on the local PVC segment.
•
If you enable PVP termination, you can optionally specify a VPI or allow the
SPVC originator or the network to choose a VPI, and the switch terminates the
SPVPC on the associated logical port.
•
If you enable both PVC and PVP termination, you must allow the SPVC
originator or the network to select the VPI/VCI or VPI.
For more information about configuring PVC/PVP Termination on the SVC, see
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