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| author | Sven Eisenhauer <sven@sven-eisenhauer.net> | 2023-11-10 15:11:48 +0100 |
|---|---|---|
| committer | Sven Eisenhauer <sven@sven-eisenhauer.net> | 2023-11-10 15:11:48 +0100 |
| commit | 33613a85afc4b1481367fbe92a17ee59c240250b (patch) | |
| tree | 670b842326116b376b505ec2263878912fca97e2 /Bachelor/CCNA4/en_CCNA4_v30/ch4/4_3_9/content.html | |
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+
+<head>
+<meta http-equiv="Content-Language" content="en-us">
+<meta http-equiv="Content-Type" content="text/html; charset=windows-1252">
+
+
+
+<title>Content</title>
+<base target="_self">
+</head>
+
+<body background="../../images/bg.gif" topmargin="0" leftmargin="0" marginheight="0" marginwidth="0" onLoad="window.focus();" link="#808080" vlink="#808080" alink="#808080">
+
+<table border="0" cellpadding="0" cellspacing="0" width="100%">
+ <tr>
+ <td bgcolor="#336666" width="18" valign="top">
+ <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"><font face="Arial" size="2" color="#FFFFFF"><b>4.</b></font><b><font face="Arial" size="2" color="#FFFFFF">3</font></b></td>
+ <td bgcolor="#336666"><img border="0" src="../../images/transdot.gif" width="10" height="1"></td>
+ <td bgcolor="#336666" width="100%"><b>
+ <font face="Arial" size="2" color="#FFFFFF">DDR Configuration</font></b></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">4.3.9</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 the DDR
+ configuration</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">There are two major types of DDR
+ problems. Either a router is not dialing when it should, or it is
+ constantly dialing when it should not. Several </font>
+ <font face="Courier New" size="2"><b>debug</b></font><font face="Arial" size="2">
+ commands can be used to help troubleshoot problems with a DDR
+ configuration.</font><p><font face="Arial" size="2">The </font>
+ <font size="2" face="Courier New"><b>debug isdn q921</b></font><font face="Arial" size="2">
+ command is useful for viewing Layer 2 ISDN call setup exchanges.
+ <img border="0" src="../../images/1.gif" align="absmiddle" width="12" height="12"> The “i =”
+ field in the Q.921 payload field is the hexadecimal value of a Q.931
+ message. In the following lines, the seventh and eighth most significant
+ hexadecimal numbers in the “i =” field indicate the type of Q.931
+ message: </font></p>
+ <ul>
+ <li><font face="Arial" size="2">0x05 indicates a call setup message
+ </font></li>
+ <li><font face="Arial" size="2">0x02 indicates a call proceeding
+ message </font></li>
+ <li><font face="Arial" size="2">0x07 indicates a call connect message
+ </font></li>
+ <li><font face="Arial" size="2">0x0F indicates a connect
+ acknowledgment (ack) message</font></li>
+ </ul>
+ <p><font face="Arial" size="2">The </font>
+ <font size="2" face="Courier New"><b>debug isdn q931</b></font><font face="Arial" size="2">
+ command is useful for observing call setup exchanges for both outgoing
+ and incoming calls.
+ <img border="0" src="../../images/2.gif" align="absmiddle" width="12" height="12">
+ <img border="0" src="../../images/3.gif" align="absmiddle" width="12" height="12"></font></p>
+ <p><font face="Arial" size="2">The </font>
+ <font size="2" face="Courier New"><b>debug dialer [events | packets]</b></font><font face="Arial" size="2">
+ command is useful for troubleshooting DDR connectivity. The </font>
+ <font size="2" face="Courier New"><b>debug dialer events</b></font><font face="Arial" size="2">
+ command sends a message to the console indicating when a DDR link has
+ connected and what traffic caused it to connect.
+ <img border="0" src="../../images/4.gif" align="absmiddle" width="12" height="12"> If a router
+ is not configured correctly for DDR, then the output of the command will
+ usually indicate the source of the problem. If there is no debug output,
+ then the router is not aware of any interesting traffic. An incorrectly
+ configured dialer or access list may be the cause. </font></p>
+ <p><font face="Arial" size="2">Not all DDR problems result in an
+ interface failing to dial. Routing protocols can cause an interface to
+ continuously dial, even if there is no user data to send. An interface
+ that is constantly going up and down is said to be flapping. The </font>
+ <font size="2" face="Courier New"><b>debug dialer packet</b></font><font face="Arial" size="2">
+ command sends a message to the console every time a packet is sent out a
+ DDR interface. Use this debug command to see exactly what traffic is
+ responsible for a flapping DDR interface.</font></p>
+ <p><font face="Arial" size="2">If a router is not connecting when it
+ should, then it is possible that an ISDN problem is the cause, as
+ opposed to a DDR problem. The remote router may be incorrectly
+ configured, or there could be a problem with the ISDN carrier network.
+ Use the </font><font size="2" face="Courier New"><b>isdn call interface</b></font><font face="Arial" size="2">
+ command to force the local router to attempt to dial into the remote
+ router. <img border="0" src="../../images/5.gif" align="absmiddle" width="12" height="12"> If
+ the routers cannot communicate using this command, then the lack of
+ connectivity is an ISDN problem, not a DDR problem. However, if the
+ routers can communicate, then both the toll network and the ISDN
+ configurations on the routers are working properly. In this case, the
+ problem is most likely an error in the DDR configuration on either
+ router.</font></p>
+ <p><font face="Arial" size="2">In some cases it is useful to reset the
+ connection between the router and the local ISDN switch. The </font>
+ <font size="2" face="Courier New"><b>clear interface bri</b></font><font face="Arial" size="2">
+ command clears currently established connections on the interface and
+ resets the interface with the ISDN switch. This command forces the
+ router to renegotiate its SPIDs with the
+ ISDN switch, and is sometimes necessary after making changes to the
+ </font><font size="2" face="Courier New"><b>isdn spid1</b></font><font face="Arial" size="2">
+ and </font><font size="2" face="Courier New"><b>isdn spid2</b></font><font face="Arial" size="2">
+ commands on an interface.</font></p>
+ <TABLE bgcolor="#669999" width="95%" cellspacing="0" cellpadding="0" border="0">
+ <TR>
+ <TD width="5">
+ <img border="0" src="../../images/lab_toplft.gif" width="116" height="23"></TD>
+ <TD>
+ <IMG alt="" height="1" width="3" src="../../images/s.gif"></TD><TD align="right" valign="top">
+ <IMG alt="" src="../../images/corner_ur_7.gif" width="7" height="7"></TD>
+ </TR>
+ </TABLE>
+
+ <TABLE bgcolor="#B0AFAF" width="95%" cellspacing="0" cellpadding="0" border="0">
+ <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/mod04/elab_4_3_9/elab4_3_9.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/mod04/elab_4_3_9/elab4_3_9.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:
+ </font><font FACE="Courier New" SIZE="2" COLOR="#808080">
+ <b>isdn spid</b></p>
+ </font><font FACE="Arial" SIZE="2" COLOR="#808080">
+ <p>In this activity, the student will demonstrate how to use the
+ </font><font FACE="Courier New" SIZE="2" COLOR="#808080">
+ <b>isdn spid </b></font><font FACE="Arial" SIZE="2" COLOR="#808080">
+ command to define at the router the service profiles identifier
+ number that was assigned by the ISDN service provided for the B1
+ channel.</p>
+ <font FACE="Arial" SIZE="2" COLOR="#000000">
+ <p></TD>
+ </TR>
+ </TABLE>
+ </TD>
+ </TR>
+ </TABLE>
+
+
+ <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>
+ <TD width="5">
+ <img border="0" src="../../images/lab_toplft.gif" width="116" height="23"></TD>
+ <TD><IMG alt="" height="1" width="3" src="../../images/s.gif"></TD><TD align="right" valign="top">
+ <IMG alt="" src="../../images/corner_ur_7.gif" width="7" height="7"></TD>
+ </TR>
+ </TABLE>
+
+ <TABLE bgcolor="#B0AFAF" width="100%" cellspacing="0" cellpadding="0" border="0">
+ <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">
+ <img border="0" src="../../images/links_icon.gif" width="25" height="25">
+ <b>Web Links</b></font></p>
+ </font><font FACE="Arial" SIZE="2" COLOR="#808080">
+
+ <p>Tech Notes<p>
+ <a target="_blank" href="http://www.cisco.com/en/US/tech/tk801/tk133/tech_tech_notes_list.html">
+ http://www.cisco.com/en/US/tech/
+ tk801/tk133/ tech_tech_notes_ ist.html</a></font></p>
+
+ <p>
+ <IMG alt="" height="2" width="1" src="../../images/s.gif"></p>
+ </TD>
+ </TR>
+ </TABLE>
+ </TD>
+ </TR>
+ </TABLE>
+ </TD>
+ </TR>
+ </TABLE><p>
+
+ <font face="Arial" size="2"> </font></td>
+ </tr>
+ </table>
+
+</body>
+
+</html>
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