Cabletron Systems 04-0053-01 User Manual
SmartSwitch ATM User Guide 4-3
Routing
IISP Routes
IISP Routing Example One
In Figure 4-1 Switch 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.
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.
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 4-2 shows
the typical “route to every point reached” IISP topology.
support, additional IISP routes must be defined between Switches D and C, B and D, and A and D. Figure 4-2 shows
the typical “route to every point reached” IISP topology.