Cisco 1003 - 1003 Router Manual de usuario descargar pdf (Pagina 15)

Designing ISDN Internetworks 11-15

Dial-on-Demand Routing

TACACS+ Address Assignment

The TACACS+ server can be conﬁgured to assign the remote node’s IP address after it authorizes

the remote node’s connection or it can be conﬁgured to return to the core router the name of a local

address pool from which the core router obtains an IP address that it assigns to the remote node.

DHCP

When using DHCP, the core router acts as a DHCP proxy for the remote node. On receipt of the IPCP

address negotiation request, the core router retrieves an IP address from the DHCP server. At the end

of the session, the router returns the address to the server. The router can also act as a DHCP relay

agent.

Conﬁguring AppleTalk DDR over ISDN

In Figure 11-5, Router A dials Router B and Router B dials Router A over ISDN using AppleTalk

DDR.

Figure 11-5 Sample AppleTalk over ISDN Topology

AppleTalk Addressing

The appletalk cable-range interface conﬁguration command speciﬁes the cable-range and node

address of each ISDN interface. The cable range must be the same on both ends of the connection.

The appletalk zone interface conﬁguration command must be entered on both routers. Use the same

zone name on both routers’ ISDN interfaces. The remote LAN interface, however, should have a

different zone name to reduce AppleTalk broadcasts across the link, as shown in Figure 11-5.

AppleTalk Routing

Use the appletalk routing global conﬁguration command to enable AppleTalk routing. The default

AppleTalk routing protocol is RTMP, with AppleTalk Enhanced IGRP Enhanced IGRP as an option.

Because AppleTalk Enhanced IGRP sends out a “hello” packet every 5 seconds, RTMP is better

suited to networks that connect by means of ISDN.

Router A Router B

7359-7359 7359.163

Zone: ISDN1

7364-7364 7364.207

Zone: ISDN3

7360-7360 7360.25

Zone: ISDN2

7360-7360 7360.26

Zone: ISDN2

E0 E0

ISDN

S4442

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Cisco 1003 - 1003 Router Manual de usuario Pagina 15