Beta Draft Confidential
Configuring PNNI Routing
PNNI Policy-based Routing
ATM Services Configuration Guide for CBX 3500, CBX 500, GX 550, and B-STDX 9000 1/19/0521-27
PNNI Policy-based Routing
PNNI Policy-based routing (PBR) allows ATM service providers to better manage
network resources, offering more control over how calls are routed in the network and
what resources these calls are permitted to access. To accomplish this, policy-based
routing relies on extensions to the PNNI routing and signaling protocol. The
extensions ensure that the tagged resources or network entities are advertised to the
entire PNNI domain, that entire network entities may be tagged with specific Network
Service Categories (NSCs), and that enhanced path selection is performed on
resources that match the associated policy constraint.
Policy-based routing allows the network administrator to manage network element
resources based on NSCs, in addition to ATM Service Categories, which are currently
available in a PNNI domain network.
Policy-based routing is supported on the following:
• Point-to-point PVC and SPVC connections
• Pure PNNI networks
• VNN/PNNI mixed networks
• CBX 3500, CBX 500, GX 550, and B-STDX 9000 switches
In this release, the only network entity that may be tagged with an NSC is a PNNI
link, at the physical port level, including both horizontal links and uplinks.
Note – This release does not support policy-based routing on point-to-point SVC
connections (UNI interface), PMP PVC, SVC, or SPVC connections. In addition,
policy-based routing is not supported on pure VNN networks or circuit defined path
(CDP) circuits.
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