that reason, multilink PPP is a better choice in this case.
will use two B channels of the same BRI.
multilink enables multilink PPP; dialer load-threshold tells the router to dial another B
channel if the utilization average on the currently used links is more than 25 percent for either
inbound or outbound utilization.
configuration that causes the IOS to use the BRI interface. Dial-on-demand routing (DDR)
configuration and concepts must be understood before the ISDN configuration topics will make
complete sense. In fact, ISDN configuration can be very brief, whereas DDR can become quite
involved. In this section, DDR is explained first, with ISDN configuration included later.
synchronous serial, or asynchronous serial interfaces are used. In this chapter, the examples
reflect ISDN; the DDR logic is the same for any of the three types of dial interfaces. DDR
includes several variations; the variation called DDR legacy is covered in this chapter. Those of
you who want to pursue CCNP and CCIE certification should expand your knowledge of DDR
concerning DDR dialer profiles in particular.
fact, one detail that is covered deeply in the earlier ISDN concepts section is the use of certain
reference points by Cisco's products; there is no need to configure the IOS to know which
interface is used. Cisco's BRI implementation includes a choice of an S/T interface or a U
interface. In either case, BRI configuration in the router is identical.
this section lists commands, provides examples, and points out tricky features. Table 8-30 and
interface bri 0
ip addr 10.3.3.1 255.255.255.0
encapsulation ppp
dialer idle-timeout 300
dialer load-threshold 25 either
dialer map 10.3.3.2 name Nashville 16155551234
dialer-group 1
ppp authentication chap
ppp multilink