Chapter 3 System Features
User Interfaces
3-16
255-700-447
PacketStar
®
PSAX 2300 Multiservice Media Gateway User Guide
, Issue 1
Release 9.0.0
ATM Maintenance
Adding new equipment, such as another PacketStar
PSAX Multimedia Gate-
way, to an ATM circuit already carrying traffic, or taking down an existing
connection, has previously required taking the affected interfaces out of ser-
vice, disrupting all connections. It is now possible, by changing the adminis-
trative weight of a private network-to-network interface (PNNI), to maintain
the ATM connection, without disrupting traffic on existing permanent virtual
circuit (PVC), soft permanent virtual circuit (SPVC), or switched virtual cir-
cuit (SVC) connections.
The new administrative weight is communicated to the PSAX system at
either end of the PNNI link by PNNI link messages. Then, when the user
restarts all the SPVC and SVC connections, the PSAX system reroutes traffic
Figure 3-2. PNNI Hierarchical Topology Showing Three Node Levels
PG(A.2)
PG(A.4)
PG(A.3)
PG(A.1)
PG(B.1)
PG(B.2)
PG(C)
A.2
A.3
A.1
B
A
C
A.3.1
A.3.4
A.3.2
A.3.3
A.2.2
A.2.3
A.2.1
A.1.3
A.1.2
A.1.1
B.1.2
B.1.1
B.1.3
B.2.2
B.2.5
B.2.1
B.2.3
B.2.4
C.1
C.2
A.4.4
A.4.5
A.4.6
A.4.1
A.4.2
A.4.3
A.4
B.1
B.2
PG (B)
Highest Level
Peer Group
Logical Link
Logical Group Node
Peer Group Leaders
Grandparent Peer Group
Child Peer Groups
Parent Peer Group
PG (A)
[ Source:
Private Network-Network Interface (PNNI 1.0) Specification Version 1.0, af-pnni-0055.000 ]
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