Protection-switched SPVC
DC-SPVC operates in conjunction
with DC-Call Control
to set up Soft PVCs across an ATM network.
A Soft PVC is a user-to-user connection in which the user-to-network connections
are PVCs, but all or part of the cross-network
connection is an SVC and does not need to be configured at every
hop across the network (as would be the case for a PVC).
White Paper
For a detailed analysis of the
benefits of using Soft PVCs, download our White Paper:
Soft PVCs
in an ATM Network (PDF format,
109 KB).
This includes a discussion of our
proprietary solution for
protection-switched
SPVCs.
Functions And Features
DC-SPVC supports the full
Soft PVC MIB Addendum to the PNNI MIB. It includes the following
functions.
- Allowing configuration and
management of Soft PVCs through MIB tables
- Establishing and maintaining
Soft PVCs using SVCs and the facilities of a signalling
stack
- Bringing down Soft PVCs by
releasing the underlying SVCs when requested to do
so through the MIB
- Recovering failed Soft PVCs
by establishing new SVCs without intervention from the
applications or from management
- Providing a Fault Tolerance
infrastructure by supporting replication of data between
primary and secondary copies of DC-SPVC
DC-SPVC supports full createAndGo and
createAndWait access to the Soft PVC MIBs. The MIB tables for Soft PVCs
are defined in the ATM Forum PNNI Specification Addendum (Soft PVC MIB).
DC-SPVC supports the following MIB tables and variables from the Soft PVC
MIB.
-
Soft PVC and PVP tables (atmSoftPVccTable and atmSoftPVpcTable)
-
Soft PVC Address table (atmInterfaceSoftPvcAddressTable)
-
Soft PVC Call Failures Trap enable
(atmSoftPvcCallFailuresTrapEenable)
-
Soft PVC Call Failures (count) (atmSoftPvcCallFailures)
-
Currently Failing Soft PVC and PVP (counts)
(atmSoftPvcCurrentlyFailingSoftPVccs and
atmSoftPvcCurrentlyFailingSoftPVpcs)
-
Soft PVC Trap Notification interval
(atmSoftPvcTrapNotificationInterval)
-
Currently Failing Soft PVC and PVP (durations)
(atmCurrentlyFailingSoftPVccTable and
atmCurrentlyFailingSoftPVpcTable)
DC-SPVC also supports the single
trap type defined by the Soft PVC MIB. If requested through the MIB, DC-SPVC
generates the following trap when a PVC fails and sends it to the MIB
Manager.
-
Soft PVC Call Failures trap (atmSoftPvcCallFailuresTrap)
DC-SPVC can optionally support proprietary
MIB tables for the explicit configuration of the route taken by the SVC part.
DC-SPVC can optionally support a
proprietary solution for providing a back-up SVC part of a Soft PVC, which takes over
in the event of the primary SVC part failing.
The benefits of this approach are
discussed in our White Paper:
Soft PVCs
in an ATM Network (PDF format,
109 KB).
For more information about Metaswitch's
ATM products and expertise contact
.