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| -rw-r--r-- | Bachelor/CCNA4/en_CCNA4_v30/ch3/3_1_7/media.html | 21 |
4 files changed, 376 insertions, 0 deletions
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+ <img border="0" src="../../images/content_lines.gif" width="16" height="25">
+ <img border="0" src="../../images/transdot.gif" width="2" height="1"></td>
+ <td bgcolor="#336666"><b><font face="Arial" size="2" color="#FFFFFF">3</font></b><font face="Arial" size="2" color="#FFFFFF"><b>.1</b></font></td>
+ <td bgcolor="#336666"><img border="0" src="../../images/transdot.gif" width="10" height="1"></td>
+ <td bgcolor="#336666" width="100%"><strong>
+ <font face="Arial" size="2" color="#FFFFFF">Serial Point-to-Point Links</font></strong></td>
+ <td width="9" bgcolor="#336666"> </td>
+ </tr>
+ <tr>
+ <td bgcolor="#669999" height="25" width="18"> </td>
+ <td bgcolor="#669999" height="25"><b>
+ <font face="Arial" size="2" color="#FFFFFF">3.1.7</font></b></td>
+ <td bgcolor="#669999"><img border="0" src="../../images/transdot.gif" width="10" height="1"></td>
+ <td bgcolor="#669999" height="25" width="100%"><strong>
+ <font face="Arial" size="2" color="#FFFFFF">Troubleshooting a serial
+ interface</font></strong></td>
+ <td bgcolor="#669999" height="25" width="9"> </td>
+ </tr></table>
+
+<table border="0" cellpadding="0" cellspacing="0" width="95%" bordercolor="#111111">
+ <tr>
+ <td width="15"></td>
+ <td>
+
+ <font FACE="Arial" SIZE="2" COLOR="#000000">The output of the </font>
+ <font FACE="Courier New" SIZE="2" COLOR="#000000"><b>show interfaces
+ serial</b></font><font FACE="Arial" SIZE="2" COLOR="#000000"> command
+ displays information specific to serial interfaces. When HDLC is configured, “Encapsulation HDLC” should be reflected in the
+ output.
+ <img border="0" src="../../images/1.gif" align="absmiddle" width="12" height="12"> When PPP
+ is configured, "Encapsulation PPP" should be seen in the output.
+ <img border="0" src="../../images/2.gif" align="absmiddle" width="12" height="12"></font><p><font face="Arial" size="2" COLOR="#000000">Five
+ possible problem states can be identified in the interface status line
+ of the </font><font FACE="Courier New" SIZE="2" COLOR="#000000"><b>
+ show interfaces serial</b></font><font face="Arial" size="2" COLOR="#000000">
+ display: <img border="0" src="../../images/3.gif" align="absmiddle" width="12" height="12"></font><ul>
+ <li><font face="Arial" size="2">Serial x is down, line protocol is
+ down</font></li>
+ <li><font face="Arial" size="2">Serial x is up, line protocol is
+ down</font></li>
+ <li><font face="Arial" size="2">Serial x is up, line protocol is up
+ (looped)</font></li>
+ <li><font face="Arial" size="2">Serial x is up, line protocol is
+ down (disabled)</font></li>
+ <li><font face="Arial" size="2">Serial x is administratively down,
+ line protocol is down</font></li>
+ </ul>
+ <p><font face="Arial" size="2">The </font>
+ <font size="2" face="Courier New"><b>show controllers</b></font><font face="Arial" size="2">
+ command is another important diagnostic tool when troubleshooting
+ serial lines. The </font><font size="2" face="Courier New"><b>show
+ controllers</b></font><font face="Arial" size="2"> output indicates
+ the state of the interface channels and whether a cable is attached
+ to the interface. In Figure
+ <img border="0" src="../../images/4.gif" align="absmiddle" width="12" height="12">, serial
+ interface 0/0 has a V.35 DTE cable attached. The command syntax
+ varies, depending on platform. For serial interfaces on Cisco 7000
+ series routers, use the </font><font size="2" face="Courier New"><b>
+ show controllers cbus</b></font><font face="Arial" size="2">
+ command.</font><p><font face="Arial" size="2">If the electrical
+ interface output is shown as UNKNOWN, instead of V.35, EIA/TIA-449,
+ or some other electrical interface type, an improperly connected
+ cable is the likely problem. A problem with the internal wiring of
+ the card is also possible. If the electrical interface is unknown,
+ the corresponding display for the </font>
+ <font size="2" face="Courier New"><b>show interfaces serial</b></font><font face="Arial" size="2">
+ <X> command will show that the interface and line protocol are down.</font><p>
+ <font face="Arial" size="2">Following are some debug commands that
+ are useful when troubleshooting serial and WAN problems:</font><ul>
+ <li><font size="2" face="Courier New"><b>debug serial interface</b></font><font face="Arial" size="2">
+ – Verifies whether HDLC keepalive packets are incrementing. If
+ they are not, a possible timing problem exists on the interface
+ card or in the network.
+ <img border="0" src="../../images/5.gif" align="absmiddle" width="12" height="12"></font></li>
+ <li><font size="2" face="Courier New"><b>debug arp</b></font><font face="Arial" size="2">
+ – Indicates whether the router is sending information about or
+ learning about routers (with ARP packets) on the other side of the
+ WAN cloud. Use this command when some nodes on a TCP/IP network
+ are responding, but others are not.</font></li>
+ <li><font size="2" face="Courier New"><b>debug frame-relay lmi</b></font><font face="Arial" size="2">
+ – Obtains Local Management Interface (LMI) information which is
+ useful for determining whether a Frame Relay switch and a router
+ are sending and receiving LMI packets. </font></li>
+ <li><font size="2" face="Courier New"><b>debug frame-relay events</b></font><font face="Arial" size="2">
+ – Determines whether exchanges are occurring between a router and
+ a Frame Relay switch.</font></li>
+ <li><font size="2" face="Courier New"><b>debug ppp negotiation</b></font><font face="Arial" size="2">
+ – Shows Point-to-Point Protocol (PPP) packets transmitted during
+ PPP startup where PPP options are negotiated.</font></li>
+ <li><font size="2" face="Courier New"><b>debug ppp packet</b></font><font face="Arial" size="2">
+ – Shows PPP packets being sent and received. This command displays
+ low-level packet dumps.</font></li>
+ <li><font size="2" face="Courier New"><b>debug ppp</b></font><font face="Arial" size="2">
+ – Shows PPP errors, such as illegal or malformed frames,
+ associated with PPP connection negotiation and operation.</font></li>
+ <li><font size="2" face="Courier New"><b>debug ppp authentication </b></font><font face="Arial" size="2">
+ – Shows PPP Challenge Handshake Authentication Protocol (CHAP) and
+ Password Authentication Protocol (PAP) packet exchanges.</font></li>
+ </ul>
+ <blockquote>
+ <p><font face="Arial" size="2"><b>Caution:</b> Debugging output is
+ assigned high priority in the CPU process and can render the
+ system unusable. For this reason, debug commands should only be
+ used to troubleshoot specific problems or during troubleshooting
+ sessions with Cisco technical support staff. It is good practice
+ to use debug commands during periods of low network traffic and
+ when the fewest users are online. Debugging during these periods
+ decreases the likelihood that increased debug command processing
+ overhead will affect system use.</font></p>
+ </blockquote>
+ <p>
+
+ <TABLE bgcolor="#B0AFAF" width="95%" border="0" cellspacing="0" cellpadding="0">
+ <TR>
+ <TD valign="top">
+ <TABLE bgcolor="#669999" width="100%" cellspacing="0" cellpadding="0" border="0">
+ <TR>
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+ <img border="0" src="../../images/lab_toplft.gif" width="116" height="23"></TD>
+ <TD>
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+ <IMG alt="" src="../../images/corner_ur_7.gif" width="7" height="7"></TD>
+ </TR>
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+
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+ <TR>
+ <TD>
+ <TABLE width="100%" cellpadding="2" cellspacing="0" border="0" bordercolor="#111111">
+ <TR>
+ <TD bgcolor="#ffffff" width="15"> </TD>
+ <TD bgcolor="#ffffff"><font FACE="Arial" SIZE="2" COLOR="#000000">
+ <p><font color="#808080">
+
+ <a target="main" href="../lab3_1_7/index.html">
+
+ <img border="0" src="../../images/lab_icon.gif" width="25" height="25"> <b>
+ Lab Activity</b></a></font></p>
+ </font><font FACE="Arial" SIZE="2" COLOR="#808080">
+ <p>Lab Exercise: Troubleshooting a Serial Interface</p>
+ <p>In this lab, the students will configure a serial interface on the London and
+ Paris routers.</p>
+ </font><font FACE="Arial" SIZE="2" COLOR="#000000">
+ <p></TD>
+ </TR>
+ </TABLE>
+ </TD>
+ </TR>
+ </TABLE>
+ </TD>
+ </TR>
+ </TABLE>
+
+
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+ <TR>
+ <TD>
+ <TABLE width="100%" cellpadding="2" cellspacing="0" border="0" bordercolor="#111111">
+ <TR>
+ <TD bgcolor="#ffffff" width="15"> </TD>
+ <TD bgcolor="#ffffff"><font FACE="Arial" SIZE="2" COLOR="#000000">
+ <p><font color="#808080">
+
+ <a href="javascript:void(0)" onClick="window.open('../../elabs/mod03/elab_3_1_7/elab3_1_7.html','Interactivity','width=740,height=390,toolbar=0,resizable=yes,scrollbars=0,screenX=26,screenY=38,left=26,top=38');">
+ <img border="0" src="../../images/lab_icon.gif" width="25" height="25"><b></a>
+ <a href="javascript:void(0)" onClick="window.open('../../elabs/mod03/elab_3_1_7/elab3_1_7.html','Interactivity','width=740,height=390,toolbar=0,resizable=yes,scrollbars=0,screenX=26,screenY=38,left=26,top=38');">Lab Activity</a></b></font></p>
+ </font><font FACE="Arial" SIZE="2" COLOR="#808080">
+ <p>e-Lab Activity: Troubleshooting a Serial Interface</p>
+ </font><font FACE="Arial" SIZE="2" COLOR="#000000">
+ <p><font color="#808080">In this lab, the student will configure a serial
+ interface on the London and Paris routers.</font></p>
+ <p></TD>
+ </TR>
+ </TABLE>
+ </TD>
+ </TR>
+ </TABLE>
+ <p>
+
+
+
+
+ </td>
+ </tr>
+ </table>
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+</html>
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