High Multicast drops

Unanswered Question
May 30th, 2007
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I keep getting very high multicast drops on several workstations. The workstations belong to different VLAN and they have all been configured for

ip pim sparse-dense-mode

ip cgmp

ip igmp version 2

and the multicast is 239.x.x.x. How can I troubleshoot this? When I do a show port or show interface, I get a clear counter.

Thanks for your help.

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irisrios Wed, 06/06/2007 - 05:21
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Reliable multicast is darned important because IP multicast is not reliable by default. Much like UDP-based applications, standard multicast drops packets on the floor, instead of suffering the performance decrement that negotiating retransmission would incur. That makes it unsuitable for content-sensitive applications, such as file distribution.



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