ATM Services Configuration Guide for CBX 3500, CBX 500, GX 550, and B-STDX 9000 14-1
Beta Draft Confidential
14
Configuring Fault-tolerant PVCs
A fault-tolerant PVC configuration enables ATM UNI DCE and DTE logical ports to
serve as a backup for any number of active UNI ports. The backup port can be
manually activated if a primary port fails or if you need to take a primary port offline.
This function is sometimes referred to as resilient UNI/NNI.
To automate PVC redundancy functions, you can also configure the CBX 500 switch
or GX 550 Multiservice WAN switch physical port on which a UNI logical port
resides for Automatic Protection Switching (APS). The APS with resilient UNI
configuration protects against facility defects and equipment failure as well as
input/output module (IOM) failure. Keep in mind that this feature requires a circuit
reroute.
Although you can configure manually activated fault-tolerant PVCs for the B-STDX,
the B-STDX switch platform does not support the APS with resilient UNI feature. See
“Using APS With Resilient UNI” on page 14-9 for more information.
Note – Resilient NNI is not currently supported on ATM modules, though it is
supported on Frame Relay modules.
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