getting 6 times the rtp packets

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Feb 5th, 2008
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We have the following problem


The network infrastructure is as follows


6513 Core (Cat OS) - contains 3 vlans - namly 200, 202, 203

The commands used here -

monitor session 1 source vlan 200, 202, 203 multicast disable

monitor session 1 destination rspan vlan 998


3750 distribution Stack 1(IOS) - switch stack is connected to Core with vlans 200, 201, 104.


The commands used here are


Monitor session 1 source vlan 200, 201, 104, 998

Monitor session 1 destination intrface 3/17, 3/18


However we are getting 6 times the rtp packets on the destination. How could we optimize on network so that we have all vlans here spanned with optimal traffic load.

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hadbou Mon, 02/11/2008 - 13:18
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As far as the packet drops are concerned most of times it comes out to be the issue due to ISP or the local connectivity to the n/w.

noeparenteau Mon, 02/11/2008 - 13:21
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sorry, I should have mentioned that these are VOICE packets.

mhurley131 Mon, 02/11/2008 - 15:36
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Can you clarify what you mean when you say you are getting 6 times the rtp packets. Do you mean on the port you are sniffing ( i am guessing you have a sniffer connected to the monitor ports) you see the same rtp packet 6 times?


If so, try removing the voice vlans from the monitor source on the 3750 and leave only the rspan vlan from the core.

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