A physical interface cannot be a backup and active at the same time

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If a physical ISDN BRI interface is used as a backup to a primary connection, it will be placed in standby mode and cannot be used as a link to another site. This method illustrates an inefficient use of router resources, because the physical BRI interface can be used to send traffic across the WAN.

In the figure shown, the branch office wants to back up its Frame Relay connection with ISDN BRI. However, the branch office also wants to use the same BRI interface as a DDR link to a small office, home office (SOHO). If the branch office places the physical BRI link in standby mode, it is deactivated and will not activate until the primary line fails or reaches a specified threshold. Thus, the BRI link cannot be used to connect to the SOHO.

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