Re: Verifying SSM

Thanks John

Aaron

On Mar 9, 2011, at 3:27 PM, John Neiberger <jneiberger_at_gmail.com> wrote:

> On Wed, Mar 9, 2011 at 1:28 PM, Aaron <aaron1_at_gvtc.com> wrote:
>> Please remind me if y'all know....i vaguely remember, something like
>> this....
>>
>> Ip igmp join-group
>>
>> ip igmp static-group
>>
>> One of them DROVE THE CPU UP LIKE CRAZY HIGH, when I was testing with a
>> couple hundred mbps of mcast traffic.....but the other one didn't. do you
>> remember which causes CPU hit (perhaps its process switched based on
>> something or the other)....sorry, I'm reaching for details that I don't
>> recall, I just remember the Cisco tac telling me that there are different
>> uses for each and don't recall the details...
>
> ip igmp join-group causes the entire multicast stream to be punted to
> the CPU because the router itself joins the group. ip igmp
> static-group just creates an entry and sends a join upstream, but the
> router CPU itself is not a recipient of the stream.
>
> One downside is that if you use ip igmp static-group: since the router
> itself is not joining the group, it will not respond to a ping if you
> ping the group. So, if you're trying to create a join that will allow
> you to test you connectivity, you pretty much have to use join-group
> instead of static-group.
>
> John

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Received on Wed Mar 09 2011 - 18:09:52 ART