From: David Lonnie (david.lonnie@gmail.com)
Date: Fri Jul 11 2008 - 13:23:05 ART
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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