From: Jason Madsen (madsen.jason@gmail.com)
Date: Fri Jul 11 2008 - 13:27:16 ART
I think DM fallback is just for sparse-dense-mode, right?
On Fri, Jul 11, 2008 at 10:23 AM, David Lonnie <david.lonnie@gmail.com>
wrote:
> Hi,experts:
> So,is the following conclusion right?
>
> In a multicast domain,all routers configured with "ip pim
> sparse-mode",without RP,C-RP,RP-agent and "ip pim autorp lisntener" command.
> There is nothing different from ip pim dense-mode", is it? because ip pim
> dm-fall is enable by default,and will fallback to dense-mode regardless of
> the interface mode configuration.
>
> correct my if i am wrong.i am really confused.
>
>
> Thanks in advance.
>
>
> On Sat, Jul 12, 2008 at 12:06 AM, Jason Madsen <madsen.jason@gmail.com>
> wrote:
>
>> I believe auto-rp listener uses dense mode only to contact the RP and
>> Mapping Agent groups (224.0.0.39 and .40), while DM Fallback allows Dense
>> mode (source to client) operation in the event of no RP.
>>
>> Jason
>>
>> On Fri, Jul 11, 2008 at 9:54 AM, David Lonnie <david.lonnie@gmail.com>
>> wrote:
>>
>>> Hi,experts:
>>> I am confused with these 2 commands.
>>> ip pim dm-fallback is enable by default.and it means,it will fallback to
>>> dense-mode,regardless of interface mode configuration.
>>> if this is right.so why need to configure ip pim autorp listener when
>>> using
>>> sparse-mode?
>>>
>>> anybody can clarify for me?
>>>
>>>
>>> Thanks in advance.
>>>
>>>
>>> David
>>>
>>>
>>>
>>>
>>> ip pim autorp listener
>>>
>>> To cause IP multicast traffic for the two Auto-RP groups 224.0.1.39 and
>>> 224.0.1.40 to be Protocol Independent Multicast (PIM) dense mode flooded
>>> across interfaces operating in PIM sparse mode, use the ip pim autorp
>>> listener command in global configuration mode. To disable this feature,
>>> use
>>> the *no* form of this command.
>>>
>>> ip pim dm-fallback
>>>
>>> To enable Protocol Independent Multicast (PIM) dense mode (DM) fallback,
>>> use
>>> the *ip pim dm-fallback* command in global configuration mode. To prevent
>>> PIM dense mode fallback and to block all multicast traffic for groups not
>>> specifically configured, use the *no* form of this command.
>>>
>>> *ip pim dm-fallback *
>>>
>>> *no ip pim dm-fallback *
>>> Syntax Description
>>>
>>> This command has no arguments or keywords.
>>> Command Default
>>>
>>> PIM dense mode fallback is enabled. That is, a multicast group in the
>>> absence of rendezvous point (RP) information will fall to dense mode,
>>> regardless of the interface mode configuration.
>>>
>>>
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