Configuring DDR Backup using BRIs and Dialer Watch

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Presentation transcript:

Configuring DDR Backup using BRIs and Dialer Watch

Purpose The use of an ISDN Basic Rate Interface (BRI) line to back up a serial connection using the Dialer Watch feature.

Configuring DDR backup Two steps: 1. Configure the DDR with either legacy DDR or dialer profiles. 2. Configure the router to initiate the backup DDR connection when the primary link fails. (Dialer Watch)

Dialer Watch Operation Pros It is useful for a multiple backup scenario It is independent of line protocol status It is dynamic routing protocol independent It is encapsulation independent It dials immediately upon the loss of the primary route

Dialer Watch Cons This is more difficult to configure It requires a routing protocol It is dependent upon the routing protocol convergence time Dialer Watch was unstable until Cisco IOS Software Release 12.1(7)

BRI0/0 BRI0/0 S0 S1 E0/0

BRI0/0 BRI0/0 S0 S1 E0/0