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New Member

Excessive CME SCCP UDP Multicast traffic

I noted what seems to be excessive multicast traffic coming from a CME 2821 and was a-wonderin what would be considered normal.

I am seeing about 55 packets per second (3300 per minute) of the following:

Source: CME Router

Destination: 239.0.0.1

Protocol: UDP

Source Port: cisco-sccp

Destination Port: cisco-sccp

Data: no human readable :)

Is this normal or is something fishy going on here.

15 REPLIES
Hall of Fame Super Gold

Re: Excessive CME SCCP UDP Multicast traffic

Not normal, possibly a bug, you can try upgrading.

New Member

Re: Excessive CME SCCP UDP Multicast traffic

I am having the same exact problem.  Any more on this topic?

New Member

Re: Excessive CME SCCP UDP Multicast traffic

I am having the same exact problem.  Any more on this topic?

Cisco Employee

Re: Excessive CME SCCP UDP Multicast traffic

That is probably MOH

New Member

Re: Excessive CME SCCP UDP Multicast traffic

I am having a problem with multicast UDP traffic causing slowness on the network.  it's broadcasting multicast cisco-sccp packets about 200 a second to every one in the place.  Below is the results of traffic monitoring on the network.

1121    21.200753    10.1.1.1    239.10.16.16    UDP    Source port: cisco-sccp  Destination port: cisco-sccp

So you think that the above indicates MOH traffic?

Wouldnt the ports be different if it were MOH?

Cisco Employee

Re: Excessive CME SCCP UDP Multicast traffic

Could you capture a Wireashark trace for a few seconds?

New Member

Re: Excessive CME SCCP UDP Multicast traffic

Sure gimme a minute.  And thanks for you help.

New Member

Re: Excessive CME SCCP UDP Multicast traffic

Thanks for your help.  I have attached the file.

Cisco Employee

Re: Excessive CME SCCP UDP Multicast traffic

Look under telephony-service in the router config, what are the two lines that start with

moh

multicast moh

New Member

Re: Excessive CME SCCP UDP Multicast traffic

Bingo.....  so if I turn this off how will MoH work? 

moh flash:/media/music-on-hold.au

multicast moh 239.10.16.16 port 2000

Cisco Employee

Re: Excessive CME SCCP UDP Multicast traffic

If you turn multicast MOH off you will not get MOH for ip phone to ip phone

calls(only TOH), you will still get MOH for PSTN calls that arew placed

on hold

New Member

Re: Excessive CME SCCP UDP Multicast traffic

Is there anyway to do the IP Phone to IP Phone without using multicast?  Is there a such thing as unicast MoH?

Cisco Employee

Re: Excessive CME SCCP UDP Multicast traffic

Yes unicast MOH is an option, however it has a maximum of only 10 phones because it places more load on the router

New Member

Re: Excessive CME SCCP UDP Multicast traffic

Ok,  Well thank you very much for your help.  Much appreciated.

Cisco Employee

Re: Excessive CME SCCP UDP Multicast traffic

Not a problem,   Good Luck

good ratings are my reward :^)

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