From: Harindha Fernando (pottaharry@gmail.com)
Date: Tue Jul 08 2008 - 03:39:11 ART
Hi,
If you have configured all the interfaces to PIM-SM then fallback mode will
be sparse , if you have at least one interface with SM-DM then
fallback mode will be Dense, by putting no ip pim dm-fallback
guaranties that fallback will be in Sparse mode.
Rgds,
Harri
On Tue, Jul 8, 2008 at 3:31 AM, John <jgarrison1@austin.rr.com> wrote:
> spt-threshhold is for source tree. The default is 0 kbs, which means that
> anything over 0 kbs will go to a source tree. no ip pim-dm fallback is to
> prevent, at least sparse-dense mode from falling back to dense mode for
> unknown groups. In the docs I've seen it used in sparse mode and sometimes
> not. I'm still trying to find a definitive answer on that. Ill probably
> end up labbing it on friday and then I'll know for sure.
>
>
>
> "The mind is like a parachute it works best when it's open"
> ----- Original Message ----- From: "Learn Cisco" <cisco.learn@yahoo.com>
> To: <ccielab@groupstudy.com>
> Cc: <cisco.learn@yahoo.com>
> Sent: Monday, July 07, 2008 5:27 PM
> Subject: Multicast Features
>
>
>
> hi, i'm trying to get a better grasp on multicast topics. any feedback to
>> the following questions would be much appreciated:
>>
>> 1.) was wondering if anyone can help differentiate between the use of "ip
>> pim spt-threshold infinity" and "no ip pim dm-fallback". they both seem to
>> prevent sparse-dense-mode and/or sparse-mode pim from reverting back to a
>> sourced-tree / shortest-path tree unless I'm missing something.
>>
>> 2.) would "ip pim accept-rp auto-rp" be needed along with one of the cmds
>> above to ensure no spt paths form?
>>
>> 3.) when would "ip pim accept-rp x.x.x.x x" be used? i guess if i get a
>> question/requirement that states to have a device accept join/prune messages
>> for an rp i'd know to use this feature, but it seems as though their might
>> be more to this thing???
>>
>> 4.) "ip pim autorp listener" is the feature to use when desiring to use
>> sparse-mode along with auto-rp, right? (without statically assigning the rp
>> mapping on all sparse-mode devices)
>>
>> thanks in advance for any input,
>>
>>
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