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We will now alter the configuration to make things stop working and look at how these problems can be identified and resolved Make these changes to the lab environment and we will troubleshoot the network and get it back into a working state 1Change the encapsulation on router 3 Serial 0 port to ppp 2Change the polarity of the DTE/DCE cable, so that the end of the cable connected to the router 2 Serial 0 port is connected to the router 3 Serial 0 port 3Configure the Ethernet 0 port on router 1 to be shut down 4Change the Autonomous System number of the IGRP process on router 2 to 15 5Disconnect the Ethernet 0 port on router 2 from the hub To effect the router configuration changes, perform the following: Router3#conf t Router3(config)#int s0 Router3(config-if)encapsulation ppp Router1#conf t Router1(config)#int e0 Router1(config-if)shutdown Router2#conf t Router2(config)#no router igrp 9 Router2(config)#router igrp 15 Router2(config-router)network 160400 A troubleshooting procedure should follow the previously described OSI seven-layer model of communications You need to check the Physical layer first, then the Data Link and so forth, until the system is communicating properly
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Overview of Physical Layer Troubleshooting
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A visual check shows whether cables are connected, but may not show a cable break The best way to determine whether a router port is physically connected is to use the show interface
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command and interpret the screen output Perform the following on router 2: Router2#show interface serial 0 Ethernet0 is up, line protocol down This is the first line of the output, and shows you that the port is okay, but was not able to establish a protocol session This is either due to an unplugged/broken cable, or a broken transceiver In this case, the cable is simply unplugged; replugging the cable brings the line protocol up The problem generated by change number 5 has been detected and corrected Next on the Physical level you should check the serial port connections Entering the following in router 2 will bring up a screen display, the last line of which is as shown Router2#show interface serial 0 DCD=up DSR=up DTR=up RTS=up CTS=up This indicates that the physical connectivity to this port is working, and all the expected EIA signals are present The port is, however, showing that the line protocol is down This is due to either clocking problems or mismatched encapsulation To resolve this, we issue the showcontrollersserial0 command on both router 2 and 3, and check that the router configuring its Serial 0 port as a DCE has the clockrate 64000 entry in its configuration By changing the polarity of the DTE/DCE cable, we match the DCE port with the "clockrate 64000"-configured serial port and resolve the problem caused by change 2 The final Physical layer issue to determine whether any ports that need to be in use are physically shut down Enter the following on router 1 Router1#show interface ethernet 0 Ethernet0 is administratively down, line protocol down The first line of the screen output as shown indicates that the port has been shut down by the administrator, by the shutdown entry in the port's configuration This can be fixed by issuing the noshutdown command in interface configuration mode, which resolves the problem caused by change 3
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Overview of Data Link Layer Troubleshooting
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For Data Link layer troubleshooting, we refer to the router configuration The only thing to check here is that connected ports share the same Data
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Link layer encapsulation By issuing the writ command to both router 2 and 3, we see mismatched layer 2 encapsulations By viewing the configurations, we see PPP as the
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With no encapsulation, the Cisco HDLC default is used Taking out the encapsulation ppp entry from the Serial 0 port of router 3 resolves problem 1
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