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Redundant MOH Server and multicast addressing

Unanswered Question
Sep 30th, 2006
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Per SRND:


http://www.cisco.com/en/US/products/sw/voicesw/ps556/products_implementation_design_guide_chapter09186a00806e8c28.html#wp1043768


I want to use the 2nd method:


"Configure separate media resource groups (MRGs) for the same MoH server, with one MRG configured to use multicast for audio streams and the second MRG configured to use unicast. "


as well as use redundancy. My questions is:


Can I use the same multicast address (ie 239.1.1.1) for primary and backup moh server or do I need to put in a 2nd multicast address (ie 239.1.1.2) on the backup MOH server.


Thanks

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thisisshanky Sat, 09/30/2006 - 20:03
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You will need to use different addresses if enabling multicast on both servers. I would do 239.1.1.1 for one server and leave (.3,.5,.7) for g711alaw, g729a and wideband codecs (if you ever use them) and then start at 239.1.1.11 for the other server and leave (.13,.15,.17) for the same codecs above.


HTH


Sankar.


PS: please remember to rate posts!

Erick Bergquist Sat, 09/30/2006 - 22:05
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Maybe for second Multicast MOH server, start at 239.1.10.1 or like 239.1.1.50.


Sankar is right, but if you add multiple audio source files and have like 4 multicast audio sources then it may start higher up for the audio source you are using.


In my time working on fixing systems I've seen people don't maintain/delete old audio sources so starting second MOH server at 239.1.1.11 could cause problems/conflicts potentially.


It would also be nice if they displayed the mcast address used for each audio source in CCMadmin so admins could see it easily without having to figure it out. Or for people who aren't aware of how the addresses increment per codec/audio source.

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