<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">DNS round-robin isn't advisable since EM should only process logins on a max of 2 nodes, and you're better off keeping one of them handling requests at a time.<div><br></div><div>The SRND has a section dedicated to this for EM. Off the top of my head SLB is the feature we recommend.</div><div><a href="http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/srnd/8x/cmapps.html#wp1189079">http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/srnd/8x/cmapps.html#wp1189079</a></div><div><br><div>
<div style="font-family: Helvetica; ">-Ryan</div>
</div>
<br><div><div>On Jul 22, 2011, at 3:53 PM, Wellnitz, Erick A. wrote:</div><br class="Apple-interchange-newline"><span class="Apple-style-span" style="border-collapse: separate; font-family: 'Lucida Grande'; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; font-size: medium; "><div lang="EN-US" link="blue" vlink="purple"><div class="WordSection1" style="page: WordSection1; "><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); ">Only problem with that is every other request will fail if one of the EM nodes is down. DNS isn’t intelligent enough to know when a server is down.<o:p></o:p></span></div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); "><o:p> </o:p></span></div><div><div style="border-right-style: none; border-bottom-style: none; border-left-style: none; border-width: initial; border-color: initial; border-top-style: solid; border-top-color: rgb(181, 196, 223); border-top-width: 1pt; padding-top: 3pt; padding-right: 0in; padding-bottom: 0in; padding-left: 0in; "><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 12pt; font-family: 'Times New Roman', serif; "><b><span style="font-size: 10pt; font-family: Tahoma, sans-serif; ">From:</span></b><span style="font-size: 10pt; font-family: Tahoma, sans-serif; "><span class="Apple-converted-space"> </span><a href="mailto:cisco-voip-bounces@puck.nether.net" style="color: blue; text-decoration: underline; ">cisco-voip-bounces@puck.nether.net</a><span class="Apple-converted-space"> </span>[mailto:cisco-voip-bounces@puck.nether.net]<span class="Apple-converted-space"> </span><b>On Behalf Of<span class="Apple-converted-space"> </span></b>ROZA, Ariel<br><b>Sent:</b><span class="Apple-converted-space"> </span>Friday, July 22, 2011 2:49 PM<br><b>To:</b><span class="Apple-converted-space"> </span><a href="mailto:stephen.welsh@unifiedfx.com" style="color: blue; text-decoration: underline; ">stephen.welsh@unifiedfx.com</a>; Bill Riley<br><b>Cc:</b><span class="Apple-converted-space"> </span><a href="mailto:cisco-voip@puck.nether.net" style="color: blue; text-decoration: underline; ">cisco-voip@puck.nether.net</a><br><b>Subject:</b><span class="Apple-converted-space"> </span>Re: [cisco-voip] Extension Mobility Service URL<o:p></o:p></span></div></div></div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 12pt; font-family: 'Times New Roman', serif; "><o:p> </o:p></div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); ">Another, simpler, way is to us DNS round robin, setting the EM URL to a hostname instead of an IP address.<o:p></o:p></span></div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); ">The DNS Server should then have two A records with the same name pointing to both subscribers´s IP addresses.<o:p></o:p></span></div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); "><o:p> </o:p></span></div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); ">Ariel.<o:p></o:p></span></div><div><div style="border-right-style: none; border-bottom-style: none; border-left-style: none; border-width: initial; border-color: initial; border-top-style: solid; border-top-color: rgb(181, 196, 223); border-top-width: 1pt; padding-top: 3pt; padding-right: 0in; padding-bottom: 0in; padding-left: 0in; "><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 12pt; font-family: 'Times New Roman', serif; "><b><span style="font-size: 10pt; font-family: Tahoma, sans-serif; ">From:</span></b><span style="font-size: 10pt; font-family: Tahoma, sans-serif; "><span class="Apple-converted-space"> </span><a href="mailto:cisco-voip-bounces@puck.nether.net" style="color: blue; text-decoration: underline; ">cisco-voip-bounces@puck.nether.net</a><span class="Apple-converted-space"> </span>[mailto:cisco-voip-bounces@puck.nether.net]<span class="Apple-converted-space"> </span><b>On Behalf Of<span class="Apple-converted-space"> </span></b><a href="mailto:stephen.welsh@unifiedfx.com" style="color: blue; text-decoration: underline; ">stephen.welsh@unifiedfx.com</a><br><b>Sent:</b><span class="Apple-converted-space"> </span>viernes, 22 de julio de 2011 09:26 a.m.<br><b>To:</b><span class="Apple-converted-space"> </span>Bill Riley<br><b>Cc:</b><span class="Apple-converted-space"> </span><a href="mailto:cisco-voip@puck.nether.net" style="color: blue; text-decoration: underline; ">cisco-voip@puck.nether.net</a><br><b>Subject:</b><span class="Apple-converted-space"> </span>Re: [cisco-voip] Extension Mobility Service URL<o:p></o:p></span></div></div></div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 12pt; font-family: 'Times New Roman', serif; "><span lang="ES-AR"><o:p> </o:p></span></div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 12pt; font-family: 'Times New Roman', serif; "><span lang="ES-AR">I've seen some people create two Extension Mobility Service URL's and subscribed both services to all phones i.e.:<o:p></o:p></span></div><div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 12pt; font-family: 'Times New Roman', serif; "><span lang="ES-AR"><o:p> </o:p></span></div></div><div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 12pt; font-family: 'Times New Roman', serif; "><span lang="ES-AR">Primary Login Service<o:p></o:p></span></div></div><div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 12pt; font-family: 'Times New Roman', serif; "><span lang="ES-AR">Backup Login Service<o:p></o:p></span></div></div><div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 12pt; font-family: 'Times New Roman', serif; "><span lang="ES-AR"><o:p> </o:p></span></div></div><div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 12pt; font-family: 'Times New Roman', serif; "><span lang="ES-AR">Cuts on the cost/complexity of a load balancer (the best solution), but does require the user to engage the back-up service manually.<o:p></o:p></span></div></div><div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 12pt; font-family: 'Times New Roman', serif; "><span lang="ES-AR"><o:p> </o:p></span></div></div><div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 12pt; font-family: 'Times New Roman', serif; "><span lang="ES-AR">Thanks<o:p></o:p></span></div></div><div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 12pt; font-family: 'Times New Roman', serif; "><span lang="ES-AR"><o:p> </o:p></span></div></div><div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 12pt; font-family: 'Times New Roman', serif; "><span lang="ES-AR">Stephen<o:p></o:p></span></div></div><div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 12pt; font-family: 'Times New Roman', serif; "><span lang="ES-AR"><o:p> </o:p></span></div><div><div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 12pt; font-family: 'Times New Roman', serif; "><span lang="ES-AR">On 22 Jul 2011, at 13:11, Bill Riley wrote:<o:p></o:p></span></div></div><p class="MsoNormal" style="margin-top: 0in; margin-right: 0in; margin-bottom: 12pt; margin-left: 0in; font-size: 12pt; font-family: 'Times New Roman', serif; "><span lang="ES-AR"><o:p> </o:p></span></p><div><div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); ">You need to use a hardware load balancer and point the URL to the load balancer IP.</span><o:p></o:p></div></div><div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); "> </span><o:p></o:p></div></div><div><div style="border-right-style: none; border-bottom-style: none; border-left-style: none; border-width: initial; border-color: initial; border-top-style: solid; padding-top: 3pt; padding-right: 0in; padding-bottom: 0in; padding-left: 0in; border-width: initial; border-color: initial; "><div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 12pt; font-family: 'Times New Roman', serif; "><b><span style="font-size: 10pt; font-family: Tahoma, sans-serif; ">From:</span></b><span class="apple-converted-space"><span style="font-size: 10pt; font-family: Tahoma, sans-serif; "> </span></span><span style="font-size: 10pt; font-family: Tahoma, sans-serif; "><a href="mailto:cisco-voip-bounces@puck.nether.net" style="color: blue; text-decoration: underline; ">cisco-voip-bounces@puck.nether.net</a><span class="apple-converted-space"> </span>[mailto:cisco-voip-bounces@puck.nether.net]<span class="apple-converted-space"> </span><b>On Behalf Of<span class="apple-converted-space"> </span></b>cips<br><b>Sent:</b><span class="apple-converted-space"> </span>Friday, July 22, 2011 6:43 AM<br><b>To:</b><span class="apple-converted-space"> </span><a href="mailto:cisco-voip@puck.nether.net" style="color: blue; text-decoration: underline; ">cisco-voip@puck.nether.net</a><br><b>Subject:</b><span class="apple-converted-space"> </span>Re: [cisco-voip] Extension Mobility Service URL</span><o:p></o:p></div></div></div></div><div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 12pt; font-family: 'Times New Roman', serif; "> <o:p></o:p></div></div><div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); ">Or you can use a single-sign-on application like ALM which does not rely on the service URL but verifies the cm’s for sending the logon logoff messages.</span><o:p></o:p></div></div><div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); "> </span><o:p></o:p></div></div><div style="border-right-style: none; border-bottom-style: none; border-left-style: none; border-width: initial; border-color: initial; border-top-style: solid; padding-top: 3pt; padding-right: 0in; padding-bottom: 0in; padding-left: 0in; border-width: initial; border-color: initial; "><div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 12pt; font-family: 'Times New Roman', serif; "><b><span style="font-size: 10pt; font-family: Tahoma, sans-serif; ">From:</span></b><span class="apple-converted-space"><span style="font-size: 10pt; font-family: Tahoma, sans-serif; "> </span></span><span style="font-size: 10pt; font-family: Tahoma, sans-serif; "><a href="mailto:cisco-voip-bounces@puck.nether.net" style="color: blue; text-decoration: underline; ">cisco-voip-bounces@puck.nether.net</a><span class="apple-converted-space"> </span>[mailto:cisco-voip-bounces@puck.nether.net]<span class="apple-converted-space"> </span><b>On Behalf Of<span class="apple-converted-space"> </span></b>Mike King<br><b>Sent:</b><span class="apple-converted-space"> </span>donderdag 21 juli 2011 23:07<br><b>To:</b><span class="apple-converted-space"> </span>Cisco VoIPoE List<br><b>Subject:</b><span class="apple-converted-space"> </span>[cisco-voip] Extension Mobility Service URL</span><o:p></o:p></div></div></div><div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 12pt; font-family: 'Times New Roman', serif; "><span lang="NL"> </span><o:p></o:p></div></div><div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 12pt; font-family: 'Times New Roman', serif; "><span lang="NL">We had to bring down a Subscriber last night, and had no issues other than extension mobility. The services URL specifically referenced this Subscriber.</span><o:p></o:p></div></div><div><div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 12pt; font-family: 'Times New Roman', serif; "><span lang="NL">Since we have a few subscribers, is there a way to make this a little more fault tolerant? I notice most of the other URL's (Corporate Directory) all start with Application/Cisco instead of<a href="http://IP/" style="color: blue; text-decoration: underline; ">http://IP</a><span class="apple-converted-space"> </span>address of server.</span><o:p></o:p></div></div></div><div><div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 12pt; font-family: 'Times New Roman', serif; "><span lang="NL"> </span><o:p></o:p></div></div></div><div><div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 12pt; font-family: 'Times New Roman', serif; "><span lang="NL">The next time I have a similar issue, and I need to change that URL, are they're any services I need to restart? Reset phones? Will it just work?</span><o:p></o:p></div></div></div><div><div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 12pt; font-family: 'Times New Roman', serif; "><span lang="NL"> </span><o:p></o:p></div></div></div><div><div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 12pt; font-family: 'Times New Roman', serif; "><span lang="NL">Mike</span><o:p></o:p></div></div></div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 13.5pt; font-family: Helvetica, sans-serif; ">_______________________________________________<br>cisco-voip mailing list<br><a href="mailto:cisco-voip@puck.nether.net" style="color: blue; text-decoration: underline; ">cisco-voip@puck.nether.net</a><br><a href="https://puck.nether.net/mailman/listinfo/cisco-voip" style="color: blue; text-decoration: underline; ">https://puck.nether.net/mailman/listinfo/cisco-voip</a><o:p></o:p></span></div></div></div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 12pt; font-family: 'Times New Roman', serif; "><span lang="ES-AR"><o:p> </o:p></span></div></div></div><table><tbody><tr><td bgcolor="#ffffff"><font color="#000000"><pre>===========================================================
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