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100

101

Dial Backup Implementation Notes

117353-B Rev. 00

7-3

Using Unnumbered Interfaces to Dial an Alternative Site

IP unnumbered interfaces define a point-to-point connection for which you do not

configure a specific IP address, for example, 128.185.35.70. Instead, you

configure an address of 0.0.0.0. Unnumbered interfaces are useful because the

router is no longer restricted to a specific IP destination address. This gives the

router the flexibility to dial another site if it cannot reach the original destination.

If you configure unnumbered IP over a PPP primary circuit, and the connection to

the destination router fails, the local router automatically dials each phone number

in the outgoing phone list until it successfully connects to another router.

You can also configure unnumbered interfaces for IPX and bridging; however, the

sample network that follows describes only IP to simplify the example. For more

information about unnumbered interfaces, see Configuring IP Services,

Configuring IPX Services, or Configuring Bridging Services.

Sample Network Using Unnumbered Interfaces

Figure 7-1 shows a sample network using IP unnumbered interfaces and dial

backup service. Router A, the remote router, connects to Router B, the regional

router, via a primary leased line. Router B connects to Router C, the central router,

via a regular leased line, that is, a leased line without dial backup service.

Figure 7-1. Dialing an Alternative Router Using IP Unnumbered Interfaces

0.0.0.0 192.32.10.2

router B

Regional

0.0.0.0 192.32.10.1

0.0.0.0

Backup

Primary

Leased

1-Primary line between routers A and B

2-Leased line between routers B and C

3-First attempt backup line for router A

and demand line for router C

Demand

router C

Central

router A

Remote

DS0018A

4-Second attempt backup line for router A

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