說明奧山威克諾ccna6-3configuring serial encapsulation

1、WAN ConnectionsConfiguring Serial EncapsulationCircuit SwitchingPublic Switched Telephone NetworkPSTN ConsiderationsAdvantagesSimplicityAvailabilityCostDisadvantagesLow data ratesRelatively long connection setup timeLeased LineWAN Connection BandwidthEnter global configuration mode.RouterX(config-if

2、)#clock rate 64000RouterX(config-if)#RouterX(config)#interface serial 0/0/0 RouterX(config-if)#RouterX#configure terminalRouterX(config)#RouterX(config-if)#bandwidth 64RouterX(config-if)#exitRouterX(config)#exitRouterX#Specify interface.Set clock rate (on DCE interfaces only).Set bandwidth ( mended)

3、.Configuring a Serial InterfaceShows the serial cable type Serial Interface show controller CommandPoint-to-Point ConsiderationsAdvantagesSimplicityQualityAvailabilityDisadvantagesCostLimited flexibilityHDLC and Cisco HDLCRouterX(config-if)# encapsulation hdlcEnables Cisco HDLC encapsulationUses the

4、 default encapsulation on synchronous serial interfacesConfiguring HDLC EncapsulationLeased LinePPPAn Overview of PPPPPP can carry packets from several protocol suites using NCP.PPP controls the setup of several link options using LCP.RouterX(config-if)# encapsulation pppEnables PPP encapsulationEna

5、ble PPP Encapsulation PPP Configuration Examplehostname left!int serial 0 ip address 10.0.1.1 255.255.255.0 encapsulation ppphostname right!int serial 0 ip address 10.0.1.2 255.255.255.0 encapsulation pppRouterX# show interface s0/0/0Serial0/0/0 is up, line protocol is up Hardware is HD64570 Interne

6、t address is 10.140.1.2/24 MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec, rely 255/255, load 1/255 Encapsulation PPP, loopback not set, keepalive set (10 sec) LCP Open Open: IPCP, CDPCP Last input 00:00:05, output 00:00:05, output hang never Last clearing of show interface counters never Queueing str

7、ategy: fifo Output queue 0/40, 0 drops; input queue 0/75, 0 drops 5 minute input rate 0 bits/sec, 0 packets/sec 5 minute output rate 0 bits/sec, 0 packets/sec 38021 packets input, 5656110 bytes, 0 no buffer Received 23488 broadcasts, 0 runts, 0 giants, 0 throttles 0 input errors, 0 CRC, 0 frame, 0 o

8、verrun, 0 ignored, 0 abort 38097 packets output, 2135697 bytes, 0 underruns 0 output errors, 0 collisions, 6045 interface resets 0 output buffer failures, 0 output buffers swapped out 482 carrier transitions DCD=up DSR=up DTR=up RTS=up CTS=up Verifying a Serial Interface ConfigurationRouterX# show i

9、nterface s0/0/0Serial0/0/0 is up, line protocol is up Hardware is HD64570 Internet address is 10.140.1.2/24 MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec, rely 255/255, load 1/255 Encapsulation PPP, loopback not set, keepalive set (10 sec) LCP Open Open: IPCP, CDPCP Last input 00:00:05, output 00:00:

10、05, output hang never Last clearing of show interface counters never Queueing strategy: fifo Output queue 0/40, 0 drops; input queue 0/75, 0 drops 5 minute input rate 0 bits/sec, 0 packets/sec 5 minute output rate 0 bits/sec, 0 packets/sec 38021 packets input, 5656110 bytes, 0 no buffer Received 234

11、88 broadcasts, 0 runts, 0 giants, 0 throttles 0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort 38097 packets output, 2135697 bytes, 0 underruns 0 output errors, 0 collisions, 6045 interface resets 0 output buffer failures, 0 output buffers swapped out 482 carrier transitions DCD=up DSR=

12、up DTR=up RTS=up CTS=up Verifying the HDLC and PPP Encapsulation ConfigurationFrame RelayFrame Relay Devices and Virtual CircuitsATM and Cell SwitchingSummaryA point-to-point (or serial) line can connect two geographically distant sites. These lines are usually leased from a carrier and are, therefo

13、re, often called leased lines.Bandwidth refers to the rate at which data is transferred over the communication link. In North America, point-to-point leased-line bandwidth is typically specified as a DS number (DS0, DS1, and so forth) that technically refers to the rate and format of the signal. The

14、 HDLC protocol is one of two major data link layer protocols commonly used with point-to-point WAN connections. HDLC supports both point-to-point and multipoint configurations.The encapsulation hdlc interface configuration command can be used to specify Cisco HDLC encapsulation on the interface.PPP

15、lower-level functions use synchronous and asynchronous physical media. PPP higher-level functions carry packets from several network layer protocols using NCPs.Summary (Cont.)The encapsulation ppp interface configuration command can be used to specify PPP encapsulation on the interface.The show interface command can be used to verify proper configuration of PPP encapsulation.Frame Relay data rates are commonly up to 4 Mb/s, with some providers offering even higher rates. Frame Relay is a simpler protocol that works at the data link layer rather than at the network layer.ATM is a type of cell