Avaya Configuring Dial Services Manual de usuario descargar pdf (Pagina 68)

Configuring Dial Services

3-18

Bandwidth for Backup Circuits

Timing-sensitive protocols or interactive protocols (for example, Telnet) may not

function correctly over a backup circuit that has less bandwidth than the primary

circuit. When user-response time is critical, backup circuits require equal

bandwidth as the primary circuits.

Using Unnumbered Interfaces to Dial an Alternate Site

IP unnumbered interfaces are interfaces on 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 an alternate site if it cannot reach the original

destination.

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

destination router fails, you can dial an alternate router.

You can also conﬁgure unnumbered interfaces for IPX and bridge protocols;

however, the sample application that follows describes only IP to simplify the

example. For more information about unnumbered interfaces,refer to Conﬁguring

IP Services; Conﬁguring IPX Services; or Conﬁguring Bridging Services.

Sample Network Using Unnumbered Interfaces

Figure 3-6 shows an example using IP unnumbered interfaces and dial backup.

Router A, the remote router, connects to Router B, the regional router, via a

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

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Avaya Configuring Dial Services Manual de usuario Pagina 68