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High Multicast drops

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.

1 REPLY
Silver

Re: High Multicast drops

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.

http://www.cisco.com/en/US/products/hw/switches/ps708/products_tech_note09186a00804916e0.shtml#understand

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