Beta Draft Confidential
Configuring PNNI Routing
PNNI Signaling Overview
ATM Services Configuration Guide for CBX 3500, CBX 500, GX 550, and B-STDX 9000 1/19/0521-15
UNI 4.0 Signaling Features
PNNI signaling adds support for the following UNI 4.0 signaling features:
• PNNI routing for dynamic call setup.
• PNNI crankback for reattempting a connection setup in progress that has
encountered a partial failure. Crankback allows the dynamic rerouting of call
setups around failed nodes or links (or links with insufficient resources).
PNNI signaling does not support some UNI 4.0 signaling features, such as
leaf-initiated join capability or user-to-user supplementary service.
PNNI signaling makes use of PNNI routing information. PNNI uses the route
calculations derived from the reachability, connectivity, and resource information
dynamically maintained by PNNI routing. These routes are calculated as needed from
the node’s view of the current topology.
PNNI and CBX/GX PVCs
Navis EMS-CBGX allows for the configuration of CBX/GX PVCs through the
selection of PVC endpoints (node/LPort), only. The optimal circuit path that the PVC
traverses is not defined; instead, the path is chosen dynamically by Lucent internal
routing protocols. This feature provides a significant degree of fault tolerance for the
circuit. In case of circuit failure, an alternate path is chosen automatically and the PVC
is rerouted over the new path, without requiring that you reconfigure the PVC.
This dynamic routing support for PVCs can now extend to PNNI networks or
PNNI/VNN hybrid networks through the use of an automatically advertised address,
called the Lucent node prefix. This feature allows PVCs with any combination of
Frame Relay UNI, ATM UNI, ATM NNI (BICI), or Point-to-Point Protocol (PPP)
logical ports to be routed over a PNNI path or PNNI/VNN path combination.
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