Each router only decrements 1 hop per router - not interface - so
technically it would be 2 hops away.
Every interface involved in Multicast needs to have PIM enabled in
some sort of fashion (including the Loopback interface if streaming
out to a PSTN POTS Trunk!) - the easiest for the Voice lab being PIM-
Dense where we flood everywhere and do not care about RPs.
Bear in mind you will not hear Multicast if you phone HQ Phone 3 to
BR1 Phone 3 (where both those phones are IPBlue or even hardware
phones behind your EasyVPN connection) and hit hold - due to the fact
that IPSec only supports Unicast traffic - not Multicast or Broadcast
traffic.
You CAN hear it however by picking up lets say BR1 Phone 3 and phoning
out to the PSTN (911 for ease) and putting the PSTN Phone on hold by
pressing hold from the BR1 Phone.
This puts the BR1 Gateway on hold technically - and the BR1 Gateway
turns the VoIP - into regular old PCM - sends it out the PRI - over to
the PSTN Gateway PRI - then becomes VoIP again (this time Unicast) and
streams to the PSTN Phone.
Assuming you are controlling your PSTN Phone with an IPBlue client (we
show you how on the ProctorLabs Voice vRack web page) - then you
should hear the stream and be able to do a "sh ip mroute" along with
the PerfMon tool on the UCM Server - and verify that Multicast is
indeed working and you can hear it!
Cheers,
Mark Snow
CCIE #14073 (Voice, Security)
CCSI #31583
Senior Technical Instructor - IPexpert, Inc.
A Cisco Learning Partner - We Accept Learning Credits!
Telephone: +1.810.326.1444
Fax: +1.309.413.4097
Mailto: [EMAIL PROTECTED]
IPexpert - The Global Leader in Self-Study, Classroom-Based, Video On
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Lab, CCIE Security Lab, CCIE Service Provider Lab , CCIE Voice Lab and
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On Feb 13, 2008, at 12:06 AM, jason sung wrote:
I am little confused on Multicast MOH hops. Can somebody correct me
if I am wrong about the following.
1. MOH server is in the same vlan as voice vlan
In this case if I were to stream MMOH to Branch 1: My hop count will
be 3.
1st hop is local voice vlan, 2nd hop is the WAN link and 3rd hop is
the branch 1 phones.
2. MOH server is in a seperate server vlan.
In this case if I were to stream MMOH to Branch 1: My hop count will
still be 3.
1st hop is server vlan, 2nd hop is my WAN link and 3rd hop is the
branch 1 phones.
Do I need to place "ip pim-dense mode" command on the serial
interfaces as well?
Jason.
