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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">When running “show controller e1” you should see a number of interface errors; line code violations, path code violations, errored seconds… that sort of thing.
These generally indicate equipment or cabling failure. In my experience, carriers are notorious for not getting involved unless you really pressure them, and this includes the passive threat that “if it isn’t our problem, we’ll send you a bill”, etc. If you
see “slipped seconds”, this generally indicates a timing issue. I saw this a lot with the 1<sup>st</sup> gen dual port VWIC cards, but it can happen anytime there is a misconfiguration (ie: should pull timing from carrier, but pulling it internally).<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">I haven’t fully read this, but it looks like a decent start if you need to troubleshoot cabling to your dmarc – The idea is to use a E1 loop and run ping tests
against the interface itself using a variety of data patterns and datagram sizes.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><a href="http://www.cisco-help.org/2011/05/youre-having-intermittent-issue-with.html">http://www.cisco-help.org/2011/05/youre-having-intermittent-issue-with.html</a><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">To create the loop, use these instructions:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><a href="http://www.cisco.com/en/US/tech/tk713/tk628/technologies_tech_note09186a008010059a.shtml#topic1">http://www.cisco.com/en/US/tech/tk713/tk628/technologies_tech_note09186a008010059a.shtml#topic1</a><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">At any rate, if you can run a handful of extensive ping tests without incrementing any of the E1 counter errors, that’s usually enough to get the carrier looking
into it. Don’t forget to clear counters before testing.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> cisco-voip [mailto:cisco-voip-bounces@puck.nether.net]
<b>On Behalf Of </b>costas georgiou<br>
<b>Sent:</b> Wednesday, June 26, 2013 10:04 AM<br>
<b>To:</b> cisco-voip@puck.nether.net<br>
<b>Subject:</b> [cisco-voip] Calls dropping<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-family:"Calibri","sans-serif"">Hi All,<br>
<br>
We have a CME gateway running at one of our sites. Apparently calls have been dropping today. I had a look at the logs and I could see the following:<br>
<br>
Jun 26 07:33:57.786: %MARS_NETCLK-3-HOLDOVER: Entering Holdover for Controller E1 0/0/0<br>
Jun 26 07:33:59.622: %LINK-3-UPDOWN: Interface Serial0/0/0:15, changed state to down<br>
Jun 26 07:34:01.622: %LINK-3-UPDOWN: Interface Serial0/0/0:15, changed state to up<br>
Jun 26 07:34:02.038: %MARS_NETCLK-3-HOLDOVER: Exiting Holdover for Controller E1 0/0/0<br>
Jun 26 07:35:21.786: %MARS_NETCLK-3-HOLDOVER: Entering Holdover for Controller E1 0/0/0<br>
Jun 26 07:35:25.038: %MARS_NETCLK-3-HOLDOVER: Exiting Holdover for Controller E1 0/0/0<br>
Jun 26 09:06:06.857: %MARS_NETCLK-3-HOLDOVER: Entering Holdover for Controller E1 0/0/0<br>
Jun 26 09:06:10.109: %MARS_NETCLK-3-HOLDOVER: Exiting Holdover for Controller E1 0/0/0<br>
Jun 26 10:25:55.761: %MARS_NETCLK-3-HOLDOVER: Entering Holdover for Controller E1 0/0/0<br>
Jun 26 10:25:59.013: %MARS_NETCLK-3-HOLDOVER: Exiting Holdover for Controller E1 0/0/0<br>
Jun 26 10:29:28.761: %MARS_NETCLK-3-HOLDOVER: Entering Holdover for Controller E1 0/0/0<br>
Jun 26 10:29:32.013: %MARS_NETCLK-3-HOLDOVER: Exiting Holdover for Controller E1 0/0/0<br>
Jun 26 10:32:28.761: %MARS_NETCLK-3-HOLDOVER: Entering Holdover for Controller E1 0/0/0<br>
Jun 26 10:32:32.013: %MARS_NETCLK-3-HOLDOVER: Exiting Holdover for Controller E1 0/0/0<br>
Jun 26 13:53:51.652: %MARS_NETCLK-3-HOLDOVER: Entering Holdover for Controller E1 0/0/0<br>
Jun 26 13:53:54.904: %MARS_NETCLK-3-HOLDOVER: Exiting Holdover for Controller E1 0/0/0<br>
Jun 26 13:54:10.652: %MARS_NETCLK-3-HOLDOVER: Entering Holdover for Controller E1 0/0/0<br>
Jun 26 13:54:13.904: %MARS_NETCLK-3-HOLDOVER: Exiting Holdover for Controller E1 0/0/0<br>
Jun 26 13:54:37.652: %MARS_NETCLK-3-HOLDOVER: Entering Holdover for Controller E1 0/0/0<br>
Jun 26 13:54:40.904: %MARS_NETCLK-3-HOLDOVER: Exiting Holdover for Controller E1 0/0/0<br>
Jun 26 13:56:11.652: %MARS_NETCLK-3-HOLDOVER: Entering Holdover for Controller E1 0/0/0<br>
Jun 26 13:56:14.904: %MARS_NETCLK-3-HOLDOVER: Exiting Holdover for Controller E1 0/0/0<br>
Jun 26 13:58:12.652: %MARS_NETCLK-3-HOLDOVER: Entering Holdover for Controller E1 0/0/0<br>
Jun 26 13:58:15.904: %MARS_NETCLK-3-HOLDOVER: Exiting Holdover for Controller E1 0/0/0<br>
Jun 26 13:59:17.716: %MARS_NETCLK-3-HOLDOVER: Entering Holdover for Controller E1 0/0/0<br>
<br>
I am quite sure this is a Carrier issue, I have raised it with them and they say the line is clean. Anyone come across this befor?<br>
<br>
Regards<br>
<br>
Cos<o:p></o:p></span></p>
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