3Com CoreBuilder 9000, User Manual

Page: 333 / 468

12
E-IISP P
ROTOCOL
This chapter provides basic concepts and information about:
Introducing Enhanced Interim InterSwitch Protocol (E-IISP)
IISP vs. E-IISP
Hierarchy in an E-IISP Network
Planning a Network with E-IISP
E-IISP Hierarchic Routing Algorithm
Introducing
Enhanced Interim
InterSwitch
Protocol (E-IISP)
E-IISP is a 3Com proprietary hop-by-hop dynamic routing protocol. It was
developed as an improvement to the ATM Forum IISP standard. E-IISP
defines a protocol for
dynamic updates of the topology database in each
switch. This enables the switch to automatically learn the addresses of
other switches and end stations attached to them. In addition, the
CoreBuilder
®
9000 ATM Enterprise Switch employs a proprietary
hierarchical routing algorithm (see “Routing — Internal Links” on page
368). This hierarchical routing algorithm requires that the network be
connected in a hierarchical topology, along with an addressing scheme
similar to that used in telephone networks.