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Configuring DDR Backup using BRIs and Dialer Watch

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.

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Configuring DDR Backup using BRIs and Dialer Watch

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  1. Configuring DDR Backup using BRIs and Dialer Watch

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

  3. 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)

  4. 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

  5. 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)

  6. BRI0/0 BRI0/0 S0 S1 E0/0

  7. BRI0/0 BRI0/0 S0 S1 E0/0

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