cancel
Showing results for 
Search instead for 
Did you mean: 
cancel
267
Views
0
Helpful
1
Replies

High Multicast drops

londint
Level 1
Level 1

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 1

irisrios
Level 6
Level 6

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

Getting Started

Find answers to your questions by entering keywords or phrases in the Search bar above. New here? Use these resources to familiarize yourself with the community: