Pnni Signaling Protocol; Pnni Signaling - 3Com CoreBuilder 7000 Operation Manual

PNNI Signaling

Protocol
PNNI Signaling
A T M U s e r
A T M U s e r
This section will cover PNNI signaling. Topics that will be covered include:


PNNI Signaling


Establishing a Channel in PNNI


Crankback and Alternate Routing
As stated earlier, PNNI is a signaling protocol used between networks, not
users. Figure 26 displays the signaling options that exist in a typical
network.
Public UNI(PUNI)
Public UNI(PUNI)
Private Network
P U N I or
Switch
Figure 26 ATM Signaling Interfaces
PNNI signaling is used for call/connection establishment and clearing over
ATM interfaces. It is based on a subset of UNI 4.0 signaling specifications.
It makes use of the information that was gathered from the topology
database in the routing protocol (reachability, connectivity, resource
availability). It creates a Designated Transit List (DTL) as the mechanism
used to describe the path to the destination. In addition, when the path
cannot be established, crankback and alternate routing are the two
Public
B-ICI
Network
Private Network
P N N I

PNNI Signaling Protocol

Public
Network
or
Switch
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