Để chuyển tiếp lưu lượng truy cập qua các liên kết ISDN, bạn cấu hình các tuyến tĩnh trong các bộ định tuyến. Bạn chắc chắn có thể cấu hình giao thức định tuyến động để chạy trên các liên kết ISDN của bạn, nhưng sau đó liên kết không bao giờ giảm. | 218 Chapter 2 Implementation Operation Configuring Static Routes To forward traffic across the ISDN link you configure static routes in each of the routers. You certainly can configure dynamic routing protocols to run on your ISDN link but then the link never drops. So the better choice would be static routes. Keep the following in mind when you are creating static routes All participating routers must have static routes defining all routes of known networks. Default routing can be used if the network is a stub network. Here s an example of static routing with ISDN RouterA config ip route RouterA config ip route bri0 What this does is tell the router how to get to network through . The second line tells the router how to get to . Specifying Interesting Traffic After setting the route tables in each router you need to configure the router to determine what brings up the ISDN line. An administrator using the dialer-list global configuration command defines interesting packets. The command to turn on all IP traffic is shown in this output 804A config dialer-list 1 protocol ip permit 804A config int bri0 804A config-if dialer-group 1 The dialer-group command sets the access list on the BRI interface. Extended access lists can be used with the dialer-list command to define interesting traffic to just certain applications. I ll cover that in a minute. If you use the dialer-list command you must enter the dialer-group command on an interface before this will work Configuring the Dialer Information There are five steps to configuring the dialer information 1. Choose the interface. 2. Set the IP address. 3. Configure the encapsulation type. 4. Link interesting traffic to the interface. 5. Configure the number or numbers to dial. Implement Simple WAN Protocols 219 Here s how to configure those five steps 804A config t 804A config int bri0 804A config-if ip address .
