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FIGURE 25-5 ISO s HDLC Flag Address Control Data FCS Flag
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WAN frame types
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Cisco s HDLC Flag Address Control Type Data FCS Flag
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PPP Flag Address Control Protocol Data FCS Flag
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As mentioned in the preceding section, the default encapsulation on Cisco s synchronous serial interfaces is HDLC You need to use the following configuration only if you changed the data link layer protocol to something else and then need to set it back to HDLC:
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Router(config)# interface serial [slot_#/]port_# Router(config-if)# encapsulation hdlc
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Notice that you must be in the serial interface (Interface Subconfiguration mode) to change its data link layer encapsulation If you had a different encapsulation configured on the serial interface, executing this command would set the frame format to Cisco s HDLC Note that the other side must be set to Cisco s HDLC or the data link layer will fail on the interface (the interface will be up, line protocol is down )
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HDLC is the default encapsulation on synchronous serial interfaces of Cisco routers Use the show interfaces command to see the encapsulation type Use the encapsulation hdlc command to change the serial interface s encapsulation
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to Cisco s HDLC Note that if one router is a Cisco router and the other a non-Cisco router when using HDLC, the interface will show as up, line protocol is down This would also be true if one side was using PPP and the other HDLC or if a DCE was not providing any clocking to the router (DTE)
After you have configured HDLC, use the show interfaces command to view the data link layer encapsulation:
Router# show interfaces serial 1 Serial1 is up, line protocol is up Hardware is MCI Serial Internet address is 19216822 2552552550 MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec, rely 255/255, load 1/255 Encapsulation HDLC, loopback not set, keepalive set (10 sec) Last input 0:00:02, output 0:00:00, output hang never
25: WAN Introduction
Notice in this example that the physical and data link layers are up and that the encapsulation is set to Cisco s HDLC (Encapsulation HDLC) Remember that the encapsulation hdlc command is the default on a serial interface and is thus not displayed with the show running-config command Use the show interfaces command to view the encapsulation type on a serial interface Notice (from the show interfaces output) that HDLC sends keepalives and expects responses back (the default keepalive timer is 10 seconds) If no responses to the keepalives are seen, the interface will show as up, line protocol is down 2501The CD contains a multimedia demonstration of configuring HDLC on a router
CertCam ON THE CD
CERTIFICATION OBJECTIVE 2503
Whereas Cisco s HDLC is a proprietary protocol, PPP is based on an open standard defined in RFCs 1332, 1661, and 2153 PPP works with asynchronous and synchronous serial connections as well as High-Speed Serial Interfaces (HSSI) and ISDN interfaces (BRI and PRI) The following sections offer an overview of PPP and how to configure it, including authentication
HDLC on Cisco routers is proprietary and can be used only on a point-to-point connection between two Cisco routers When connecting Cisco
and non-Cisco routers on point-to-point connections, PPP should be used since it is an open standard
PPP Components
PPP has many more features than HDLC Like HDLC, PPP defines a frame type and how two PPP devices communicate with each other, including the multiplexing of network and data link layer protocols across the same link However, PPP also does the following:
Performs dynamic configuration of links Allows for authentication Compresses packet headers Tests the quality of links Performs error detection and correction Allows multiple PPP physical connections to be bound together as a single
logical connection (referred to as multilink)
PPP supports handling multiple encapsulated protocols, authentication, compression, multilink,
error detection/correction, and can be used over synchronous and asynchronous circuits
PPP has three main components:
Frame format (encapsulation) Link Control Protocol (LCP) Network Control Protocol (NCP)
Each of these three components plays an important role in the setup, configuration, and transfer of information across a PPP connection The following sections cover these components
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