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được sử dụng để biểu thị các địa chỉ mạng con, và vì vậy nó không phải là địa chỉ pháp lý cho một nút. Để xác định phạm vi của địa chỉ cho một subnet cụ thể, bạn có địa chỉ bắt đầu đó là subnet và sử dụng tất cả các địa chỉ giữa nó và địa chỉ bắt đầu của mạng con tiếp theo. | PART IV Configuring Frame Relay CHAPTER 15 7. To set the window size based on number of flow control packets for input to the router type x25 win number of packets . You could set the window size to 5 and the command would read win 5. Press Enter. 8. To set the window out setting type x25 wout followed by the number of packets such as x25 wout 5. Press Enter to continue. Figure 15.5 shows the commands entered in steps 1-8 as they appear on the router console. FIGURE 15.5 X.25 encapsulationmay require input and output packet sizes and window in and out settings. 9. To end the configuration of the interface press Ctrl Z. 10. Press Enter again to return to the privileged prompt. You can quickly view your X.25 settings on a serial interface. Type show interface serial where the serial specifies the serial interface that you configured for X.25. SEE ALSO For an overview of X.25 see page 62. Configuring Frame Relay Frame Relay is a packet-switching Data Link layer protocol that is used to connect DTE routers and DCE devices. The DCE devices on Frame Relay networks consist of the carrier-owned switches see Figure 15.6 . The Frame Relay network a private or public switched telephone network is typically represented as a cloud. Frame Relay uses permanent virtual circuits for communication sessions between points on the WAN. These virtual circuits are identified by a DLCI data link connection identifier a value provided by the Frame Relay service provider. The DLCI is provided for the connection between the router and the switch see Figure 15.6 and 265 PART IV Ad vanced Configuration and Configuration To o l s CHAPTER 15 Configuring WAN Protocols a DLCI number must be input when configuring Frame Relay on the router. FIGURE 15.6 Frame Relay provides connectivity between routers and public switches. Auto-detect the LMI Beginningwith IOS version 11.2 the router will try to auto-detect the LMI type that is being used on the line between the router and the switch. It will send a