An Example of Route Recovery
Backbone
Router (R1)
Site A
Router (R4)
Frame
Relay
Cloud
Site B
Router (R5)
Site C
Router (R6)
Head Office
Network
Primary
0Kbps
By using routing protocols such as Enhanced Interior Gateway Routing
Protocol (EIGRP) or Open Shortest Path First (OSPF), circuit downtime can be
detected in seconds prompting the backup circuit to be activated just as quickly.
But, if this backup solution uses technology such as ISDN Basic Rate Interface,
then dialing time and Point-to-Point Protocol (PPP) instability might affect how
well the routing protocol recovers the sessions and connections, so 0 Kbps Frame
Relay might be the more stable choice.