Module 33

ICND1 v1.01-1http://vnexperts.net

WAN Connections

Configuring Serial Encapsulation


Circuit Switching


Public Switched Telephone Network


PSTN Considerations

Advantages Simplicity Availability Cost

Disadvantages Low data rates Relatively long connection setup time


Leased Line


WAN Connection Bandwidth


Enter global configuration mode.

RouterX(config-if)#clock rate 64000RouterX(config-if)#

RouterX(config)#interface serial 0/0/0RouterX(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 (recommended).

Configuring a Serial Interface


Shows the serial cable type

Serial Interface show controller Command


Point-to-Point Considerations

Advantages Simplicity Quality Availability

Disadvantages Cost Limited flexibility


HDLC and Cisco HDLC


RouterX(config-if)# encapsulation hdlc Enables Cisco HDLC encapsulation Uses the default encapsulation on synchronous serial

interfaces

Configuring HDLC Encapsulation


Leased Line


PPP


An Overview of PPP

PPP can carry packets from several protocol suites using NCP. PPP controls the setup of several link options using LCP.


RouterX(config-if)# encapsulation ppp

Enables PPP encapsulation

Enable PPP Encapsulation


PPP Configuration Example

hostname left!int serial 0ip address 10.0.1.1 255.255.255.0encapsulation ppp

hostname right!int serial 0ip address 10.0.1.2 255.255.255.0encapsulation ppp


RouterX# show interface s0/0/0Serial0/0/0 is up, line protocol is upHardware is HD64570Internet address is 10.140.1.2/24MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec, rely 255/255, load 1/255Encapsulation PPP, loopback not set, keepalive set (10 sec)LCP OpenOpen: IPCP, CDPCPLast input 00:00:05, output 00:00:05, output hang neverLast clearing of "show interface" counters neverQueueing strategy: fifoOutput queue 0/40, 0 drops; input queue 0/75, 0 drops5 minute input rate 0 bits/sec, 0 packets/sec5 minute output rate 0 bits/sec, 0 packets/sec

38021 packets input, 5656110 bytes, 0 no bufferReceived 23488 broadcasts, 0 runts, 0 giants, 0 throttles0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort38097 packets output, 2135697 bytes, 0 underruns0 output errors, 0 collisions, 6045 interface resets0 output buffer failures, 0 output buffers swapped out482 carrier transitionsDCD=up DSR=up DTR=up RTS=up CTS=up

Verifying a Serial Interface Configuration


RouterX# show interface s0/0/0Serial0/0/0 is up, line protocol is upHardware is HD64570Internet address is 10.140.1.2/24MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec, rely 255/255, load 1/255Encapsulation PPP, loopback not set, keepalive set (10 sec)LCP OpenOpen: IPCP, CDPCPLast input 00:00:05, output 00:00:05, output hang neverLast clearing of "show interface" counters neverQueueing strategy: fifoOutput queue 0/40, 0 drops; input queue 0/75, 0 drops5 minute input rate 0 bits/sec, 0 packets/sec5 minute output rate 0 bits/sec, 0 packets/sec

38021 packets input, 5656110 bytes, 0 no bufferReceived 23488 broadcasts, 0 runts, 0 giants, 0 throttles0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort38097 packets output, 2135697 bytes, 0 underruns0 output errors, 0 collisions, 6045 interface resets0 output buffer failures, 0 output buffers swapped out482 carrier transitionsDCD=up DSR=up DTR=up RTS=up CTS=up

Verifying the HDLC and PPP Encapsulation Configuration


Frame Relay


Frame Relay Devices and Virtual Circuits


ATM and Cell Switching


Summary

A point-to-point (or serial) line can connect two geographically distant sites. These lines are usually leased from a carrier andare, therefore, 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 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 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-switched connection technology that is capable

of transferring voice, video, and data through private and public networks. ATM is used primarily in service-provider networks and enterprise LAN backbones. ATM virtual circuits can be either PVCs or SVCs.

WAN ConnectionsCircuit SwitchingPublic Switched Telephone NetworkPSTN ConsiderationsLeased LineWAN Connection BandwidthConfiguring a Serial InterfaceSerial Interface show controller CommandPoint-to-Point ConsiderationsHDLC and Cisco HDLCConfiguring HDLC EncapsulationLeased LinePPPAn Overview of PPPEnable PPP Encapsulation PPP Configuration ExampleVerifying a Serial Interface ConfigurationVerifying the HDLC and PPP Encapsulation ConfigurationFrame RelayFrame Relay Devices and Virtual CircuitsATM and Cell SwitchingSummarySummary (Cont.)

Module 33

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Transcript of Module 33