Section 3: ISDN (8 Points)
Ensure that VLAN3 and R4 Lo0 are accessible from R1 and beyond should the Frame Relay network fail either physically or logically. If VLAN3 and R4 Lo0 networks are restored while the ISDN line is active, ensure that traffic is routed over the Frame Relay network to these destinations immediately.
As no static routes are permitted and backing up the Frame Relay interface will not help as this only works if the Frame Relay interface is physically down, the only option will be to use the dialer-watch feature. Both networks must be down before the router dials out so VLAN3 and R4 Lo0 should be added to a dialer watch-list and corresponding dialer watch-group number under the BRI interface on R1. R1 is used to dial out as ...
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