Routing

IISPRoutes

IISP Routing Example One

In Figure 4-1Switch A is an IISP device connected to the PNNI domain through Switch B. Switch A contains an LEC, which is a member of an ELAN whose LECS is on Switch C (within the PNNI domain). If the LEC on Switch A is to make contact with the LECS on Switch C, Switch A must contain an IISP route directly to switch C. Furthermore, Switch B must contain a route to switch A over the physical link that connects the two switches.

Note Dotted lines in the diagrams below represent one-way IISP routes to the devices pointed to by the arrowheads. Each route is defined on the device from which the dotted line originates.

Figure 4-1 IISP route across PNNI domain

IISP Routing Example Two

A second IISP device (Switch D) is added behind Switch A. If Switch D also needs to reach Switch C for LANE support, additional IISP routes must be defined between Switches D and C, B and D, and A and D. Figure 4-2shows the typical “route to every point reached” IISP topology.

SmartSwitch ATM User Guide 4-3

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Cabletron Systems 04-0053-01 manual Iisp Routing Example One, Iisp Routing Example Two