Gateway Interface (Gwy); Interim Interswitch Protocol (Iisp) - 3Com CoreBuilder 9000 User Manual

Gateway Interface
(GWY)
Interim InterSwitch
Protocol (IISP)
The Gateway interface is provided for connecting the CoreBuilder 9000
Enterprise ATM Switch to ATM switches of other vendors. For this
purpose a simple, universal protocol, the IISP, is utilized.
IISP (PNNI phase 0) is the first phase standard for multiple switch
networks. This protocol defines the routing decision/algorithm according
to a static database. The database is created manually via management
and can be built in a hierarchical structure. The routing decision is based
upon address matching, full or partial, using the best match method.
Using IISP, routing decisions are made on a switch-by-switch basis. One
switch sends a request for an SVC to another, and the receiving switch
searches its address table for the destination address. The request is
passed on to another switch in the network if the destination address is
found. This procedure is repeated until the call reaches its destination.
You specify the Gateway Interface for individual ports using the
CoreBuilder 9000 ATM Enterprise Switch Local Management Application
(LMA). The ATM address prefix is configured in a Gateway port by the
Add Address command of the LMA. It is set to be the ATM address of the
switch connected to that port, as well as any ATM addresses beyond that
switch. All ATM devices that are connected to the switch are included
with the addresses. The ATM address prefix can be a full 13 byte prefix or
partial prefix with an asterisk (*) to mark the end of the significant bytes
and allows tree hierarchical definition from the tree-top without listing all
the prefixes of this tree.

Gateway Interface (GWY)

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