High Multicast drops

Unanswered Question
May 30th, 2007
User Badges:

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
  • 2
  • 3
  • 4
  • 5
Overall Rating: 0 (0 ratings)
Loading.
irisrios Wed, 06/06/2007 - 05:21
User Badges:
  • Silver, 250 points or more

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



Actions

This Discussion