<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40">
<head>
<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=us-ascii">
<meta name=Generator content="Microsoft Word 12 (filtered medium)">
<style>
<!--
/* Font Definitions */
@font-face
{font-family:"Cambria Math";
panose-1:2 4 5 3 5 4 6 3 2 4;}
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
@font-face
{font-family:Tahoma;
panose-1:2 11 6 4 3 5 4 4 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0in;
margin-bottom:.0001pt;
font-size:12.0pt;
font-family:"Times New Roman","serif";}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:purple;
text-decoration:underline;}
span.EmailStyle17
{mso-style-type:personal-reply;
font-family:"Calibri","sans-serif";
color:#1F497D;}
.MsoChpDefault
{mso-style-type:export-only;}
@page Section1
{size:8.5in 11.0in;
margin:1.0in 1.0in 1.0in 1.0in;}
div.Section1
{page:Section1;}
-->
</style>
<!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]-->
</head>
<body lang=EN-US link=blue vlink=purple>
<div class=Section1>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>If it's a delay in the route set up then you could try a static
igmp join on the far end router.<o:p></o:p></span></p>
<p class=MsoNormal><b><span style='font-size:9.5pt;font-family:"Arial","sans-serif";
color:black'>ip igmp join-group </span></b><em><span style='font-size:9.5pt;
font-family:"Arial","sans-serif";color:black'>group-address</span></em><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>
<p class=MsoNormal><b><i><span style='font-size:10.5pt;font-family:"Arial","sans-serif";
color:#1F497D'>Tony Underwood CCIE #7112<o:p></o:p></span></i></b></p>
<p class=MsoNormal><span style='font-size:10.5pt;font-family:"Arial","sans-serif";
color:#1F497D'>Sr. Network Engineer<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.5pt;font-family:"Arial","sans-serif";
color:#1F497D'>Cambium Data Inc.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.5pt;font-family:"Arial","sans-serif";
color:#1F497D'>5050 So. 111th St.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.5pt;font-family:"Arial","sans-serif";
color:#1F497D'>Omaha, NE 68137<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.5pt;font-family:"Arial","sans-serif";
color:#1F497D'>(402) 556-1388<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.5pt;font-family:"Arial","sans-serif";
color:#1F497D'><a href="http://www.cambiumdata.com/">http://www.cambiumdata.com</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>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<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-bounces@puck.nether.net [mailto:cisco-voip-bounces@puck.nether.net] <b>On
Behalf Of </b>Daniel<br>
<b>Sent:</b> Wednesday, June 24, 2009 1:46 AM<br>
<b>To:</b> cisco-voip@puck.nether.net<br>
<b>Subject:</b> [cisco-voip] Multicast MoH Delay<o:p></o:p></span></p>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<div>
<p class=MsoNormal>Hi All,<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal>I've setup multicast routing for music on hold between our
data centre network and building floor subnets. The setup is that the data
centre is on a different subnet and gear to the floor subnets so multicast
routing needs to be used to get MoH packets to the phones.<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal>This consists of the following traffic flow,<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal>MoH Server > Access Switch > Distribution
Switch/router(RP) > Distribution Switch/router > Floor Switches >
Phones<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal>There are three routing hops (1) from vlan interface to
routed interfaces of distribution switch (2) between Distribution and (3) from
routed interface of distributionswitch to phone vlan interface. Only the
distribution switches are layer 3.<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal>The first distribution switch is the RP for the group and
only that group.The second distribution switch is accepting auto RP only. We
are using sparse mode.<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal>Multicast traffic is working, the RP mappings are there, the
mroute is there, the problem is that when a call is placed on hold there is a 5
second delay before the music is heard. I assume this to be somewhat because of
the join message and the delay of the route or path being setup.<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal>Anyone know of a way to reduce the delay before music is
heard? If not I guess its back to the lab.<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal>regards,<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal>Dan<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal> <o:p></o:p></p>
</div>
</div>
</body>
</html>