<html><body><div style="color:#000; background-color:#fff; font-family:times new roman, new york, times, serif;font-size:12pt">When you shutdown the signalling channel, effectively all the bearer channels are also shutdown as nothing can traverse them due to there being no signalling channel.<br><br>Even if the provider reset the circuit, that would not bring up a shutdown interface. That could be tested on a H.323 or SIP gateway.<br><br>I am guessing that this is a MGCP gateway with ccm-manager config applied it where the router downloads the configuration file for itself off the CUCM. This would bring up the interface (D-channel) thus causing a restoration in service.<br><div><span><br></span></div><div><br></div> <div style="font-family: times new roman, new york, times, serif; font-size: 12pt;"> <div style="font-family: times new roman, new york, times, serif; font-size: 12pt;"> <div dir="ltr"> <hr size="1"> <font face="Arial" size="2"> <b><span
style="font-weight:bold;">From:</span></b> Mike King <me@mpking.com><br> <b><span style="font-weight: bold;">To:</span></b> Fred Hunt <FHunt@erdman.com> <br><b><span style="font-weight: bold;">Cc:</span></b> "cisco-voip@puck.nether.net" <cisco-voip@puck.nether.net> <br> <b><span style="font-weight: bold;">Sent:</span></b> Monday, April 15, 2013 7:30 PM<br> <b><span style="font-weight: bold;">Subject:</span></b> Re: [cisco-voip] Serial interface state change<br> </font> </div> <div class="y_msg_container"><br>
<div id="yiv556813833"><div dir="ltr">Hi Fred,<div><br></div><div style="">When you downed <font face="arial, sans-serif">Se0/0/0:23, you downed 1 channel on the PRI. leaving the other 23 channels up. The PRI was still up. You just downed the channel that has the D-Channel on it. The reason it came backup is your Service providor received an alarm on they're side showing your PRI was down. I'm assuming after a unspecified amount of time, they bounced the entire PRI to bring the channels back up. (That would the the AIS detected message, it's a test message)</font></div>
<div style=""><font face="arial, sans-serif"><br></font></div><div style=""><font face="arial, sans-serif">Downing the controller is the correct way to do this/</font></div><div style=""><font face="arial, sans-serif"><br></font></div>
<div style=""><font face="arial, sans-serif">Mike</font></div></div><div class="yiv556813833gmail_extra"><br><br><div class="yiv556813833gmail_quote">On Wed, Apr 10, 2013 at 4:14 PM, Fred Hunt <span dir="ltr"><<a rel="nofollow" ymailto="mailto:FHunt@erdman.com" target="_blank" href="mailto:FHunt@erdman.com">FHunt@erdman.com</a>></span> wrote:<br>
<blockquote class="yiv556813833gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
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<div class="yiv556813833MsoNormal">I’m trying to figure out why a serial interface seemingly changed its state on its own.<u></u><u></u></div>
<div class="yiv556813833MsoNormal"><br>
We have a PRI that we are planning to decommission. I previously removed it from being routed to in CUCM and I shut down the serial0/0/0:23 interface, as shown in the log below:<u></u><u></u></div>
<div class="yiv556813833MsoNormal">021241: Mar 16 20:32:48.963 CDT: %ISDN-6-LAYER2DOWN: Layer 2 for Interface Se0/0/0:23, TEI 0 changed to down<u></u><u></u></div>
<div class="yiv556813833MsoNormal">021242: Mar 16 20:32:50.960 CDT: %LINK-5-CHANGED: Interface Serial0/0/0:23, changed state to administratively down<u></u><u></u></div>
<div class="yiv556813833MsoNormal"><u></u> <u></u></div>
<div class="yiv556813833MsoNormal">Then, somehow the serial interface changed its state back to up. This occurred after what appeared to be a brief outage of the T1 service. Here’s the relevant log detail:<u></u><u></u></div>
<div class="yiv556813833MsoNormal">021244: Mar 18 10:25:16.673 CDT: %CONTROLLER-5-UPDOWN: Controller T1 0/0/0, changed state to down (AIS detected)<u></u><u></u></div>
<div class="yiv556813833MsoNormal">021245: Mar 18 10:25:16.881 CDT: %MARS_NETCLK-3-HOLDOVER: Entering Holdover for Controller T1 0/0/0<u></u><u></u></div>
<div class="yiv556813833MsoNormal">021246: Mar 18 10:25:18.673 CDT: %LINK-3-UPDOWN: Interface Serial0/0/0:23, changed state to down<u></u><u></u></div>
<div class="yiv556813833MsoNormal">021247: Mar 18 10:25:20.673 CDT: %CONTROLLER-5-UPDOWN: Controller T1 0/0/0, changed state to up<u></u><u></u></div>
<div class="yiv556813833MsoNormal">021248: Mar 18 10:25:22.189 CDT: %LINK-3-UPDOWN: Interface Serial0/0/0:23, changed state to up<u></u><u></u></div>
<div class="yiv556813833MsoNormal">021249: Mar 18 10:25:23.133 CDT: %MARS_NETCLK-3-HOLDOVER: Exiting Holdover for Controller T1 0/0/0<u></u><u></u></div>
<div class="yiv556813833MsoNormal">021250: Mar 18 10:25:24.917 CDT: %ISDN-6-LAYER2UP: Layer 2 for Interface Se0/0/0:23, TEI 0 changed to up<u></u><u></u></div>
<div class="yiv556813833MsoNormal"><u></u> <u></u></div>
<div class="yiv556813833MsoNormal">Today, I discovered that the interface was up and shut it down again. Then I decided to shutdown the controller itself. Here’s the log:<u></u><u></u></div>
<div class="yiv556813833MsoNormal">021310: Apr 10 13:57:23.272 CDT: %LINK-5-CHANGED: Interface Serial0/0/0:23, changed state to administratively down<u></u><u></u></div>
<div class="yiv556813833MsoNormal">021312: Apr 10 14:13:28.404 CDT: %CONTROLLER-5-UPDOWN: Controller T1 0/0/0, changed state to administratively down<u></u><u></u></div>
<div class="yiv556813833MsoNormal">021313: Apr 10 14:13:28.424 CDT: %MARS_NETCLK-3-HOLDOVER: Entering Holdover for Controller T1 0/0/0<u></u><u></u></div>
<div class="yiv556813833MsoNormal">021314: Apr 10 14:13:30.404 CDT: %LINK-3-UPDOWN: Interface Serial0/0/0:23, changed state to down<u></u><u></u></div>
<div class="yiv556813833MsoNormal"><u></u> <u></u></div>
<div class="yiv556813833MsoNormal">I observed that after shutting the controller down the state of serial0/0/0:23 changed from administratively down to down. I’m guessing that this will stick now, but I’m not sure after the earlier behavior. I don’t understand how the
serial interface was able to previously change its layer 1 state on its own. Don’t both administratively down and down mean down at the layer 1 level? Does a router automatically reset the state of serial interfaces if their associated T1 controller changes
from the down to up state?<u></u><u></u></div>
<div class="yiv556813833MsoNormal"><u></u> <u></u></div>
<div class="yiv556813833MsoNormal">Thanks,<u></u><u></u></div>
<div class="yiv556813833MsoNormal">Fred<u></u><u></u></div>
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