From: John (jgarrison1@austin.rr.com)
Date: Fri Jul 11 2008 - 14:40:17 ART
Thats not what I get from "regardless of interface mode configuration"
----- Original Message -----
From: "David Lonnie" <david.lonnie@gmail.com>
To: "Jason Madsen" <madsen.jason@gmail.com>
Cc: <ccielab@groupstudy.com>
Sent: Friday, July 11, 2008 10:52 AM
Subject: Re: ip pim autorp listener and ip pim dm-fallback
> Hey.Jason:
> yes.you are right.ip pim dm-fallback only works in ip pim sparse-dense
> mode.
> Thanks very much.
>
> This is in DocCD command reference.
> 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.
>
>
>
> And this is in DocCD configuration guid
>
> Step 14
>
> no ip pim dm-fallback
> Example:
>
> Router(config)# no ip pim dm-fallback
>
> (Optional) Prevents PIM dense mode fallback.
>
> Configure this command on all routers in a PIM sparse-mode domain.
>
>
> I have confused with this for a couple of days.
> Thanks again.
>
>
>
> David
>
> On Sat, Jul 12, 2008 at 12:39 AM, Jason Madsen <madsen.jason@gmail.com>
> wrote:
>
>> here's some device output of a device using sparse-mode and then
>> sparse-dense-mode with completely default settings:
>>
>> R0#sho run | s pim
>> ip pim sparse-mode
>> ip pim sparse-mode
>> ip pim sparse-mode
>> R0#sho ip multi
>> Multicast Routing: enabled
>> Multicast Multipath: disabled
>> Multicast Route limit: No limit
>> Multicast Triggered RPF check: enabled
>> *Multicast Fallback group mode: Sparse
>> *R0#
>>
>> R0#sho run | s pim
>> ip pim sparse-dense-mode
>> ip pim sparse-dense-mode
>> ip pim sparse-dense-mode
>> R0#sho ip multi
>> Multicast Routing: enabled
>> Multicast Multipath: disabled
>> Multicast Route limit: No limit
>> Multicast Triggered RPF check: enabled
>> *Multicast Fallback group mode: Dense*
>> R0#
>>
>> Jason
>>
>> On Fri, Jul 11, 2008 at 10:27 AM, Jason Madsen <madsen.jason@gmail.com>
>> wrote:
>>
>>> 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
>>>>>> 224.0.1.39and
>>>>>> 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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>
>
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