Private Nni; E-Iisp - 3Com CoreBuilder 9000 User Manual

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HAPTER ETWORK

Private NNI

WAN
ATM ETHER NET
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E-IISP

I M
NTERFACE ANAGEMENT
A NNI is a private NNI (P-NNI) when the switches are not part of a WAN.
P-NNI allows you to interconnect multiple switches in an arbitrary
topology and still have them work as one network. See Figure 10.
Figure 10 Multiple Switches in a Private Network
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For an ATM switch to work in an ATM network, the switch must have a
topology database and a routing engine. The topology database reflects
the network topology (the number of ATM switches, their addresses, and
their locations). The database may be static or dynamic. A static database
does not reflect on-line topology changes, whereas the dynamic database
automatically senses changes in the network topology. The ATM switch
determines the best path/route to a destination according to the topology
database, using the routing engine.
The CoreBuilder 9000 ATM Enterprise Switch implements the P-NNI in the
E-IISP NNI protocol. (For more information, see Chapter 12.)
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