From: CCIE To Be (ccie.tobe81@gmail.com)
Date: Mon Jan 19 2009 - 11:56:09 ARST
Hi,
I have observed one more thing that if I use 2 RPs in primary/backup setup
and all routers are using sparse-mode. Now if a router which is directly
connected with backup RP but not with primary RP is still able to ping
multicast groups successfully. It means in this scenario we don't need to
worry about 'autorp listner' or 'sparse-dense-mode' ??
Kindly clear this confusion.
HTH
On Mon, Jan 12, 2009 at 1:27 AM, CCIE To Be <ccie.tobe81@gmail.com> wrote:
>
> Hi Hobbs/Anthony,
>
> On hub I am using physical interface and ip pim nbma-mode is already
> configured. Because R2 and R3 are directly connected with RP ( R1 ) so we
> don't need to configure autorp listner or sparse-dense-mode untill unless I
> add another router either with R2 or R3. Thanks Hobbs for clarification.
>
>
>
> On Mon, Jan 12, 2009 at 1:15 AM, Anthony Sequeira <
> asequeira@internetworkexpert.com> wrote:
>
>> Something else to consider here - I presume you are using subinterfaces on
>> the hub router, otherwise you must be using ip pim nmba-mode there.
>>
>> Anthony J. Sequeira, CCIE #15626, CCSI #23251
>> Senior CCIE Instructor
>>
>> asequeira@internetworkexpert.com
>>
>> Internetwork Expert, Inc.
>> http://www.InternetworkExpert.com <http://www.internetworkexpert.com/>
>> Toll Free: 877-224-8987
>> Outside US: 775-826-4344
>>
>>
>> On Jan 11, 2009, at 3:52 PM, Hobbs wrote:
>>
>> Hi, Because the devices are directly connected. If you had another router
>>> attached to R2 or R3, they probably wouldn't receive the RP information
>>> and
>>> if they joined a group would not know where to send it the join. Try
>>> adding
>>> R4 to R2 or R3 and see what happens.
>>>
>>> On Sun, Jan 11, 2009 at 1:41 PM, CCIE To Be <ccie.tobe81@gmail.com>
>>> wrote:
>>>
>>> Dear Group,
>>>>
>>>> Following is the topology,
>>>>
>>>> R1,R2 & R3 are connected over frame relay network whereas R1 is the hub.
>>>> Multicasting is also running over this FR network in which R1 is acting
>>>> as
>>>> RP & Mapping Agent. All interfaces in multicast domain are in 'sparse
>>>> mode'
>>>> and following groups have been assigned to R3's ethernet for multicast
>>>> testing 224.1.1.1 & 224.2.2.2. My question is that I am not using
>>>> 'sparse-dense-mode' nor 'autorp listener' but multicast is working fine
>>>> without using any of these options. How autorp messages are propagating
>>>> across the multicast domain in this scenario ??
>>>>
>>>> Following are few outputs,
>>>>
>>>> R2#ping 224.1.1.1
>>>> Type escape sequence to abort.
>>>> Sending 1, 100-byte ICMP Echos to 224.1.1.1, timeout is 2 seconds:
>>>> Reply to request 0 from 192.168.1.3, 276 ms
>>>> Reply to request 0 from 192.168.1.3, 280 ms
>>>>
>>>> R2#show ip pim rp
>>>> Group: 224.1.1.1, RP: 1.1.1.1, v2, uptime 00:33:37, expires 00:02:04
>>>> R2#show ip pim rp mapping
>>>> PIM Group-to-RP Mappings
>>>> Group(s) 224.1.1.1/32
>>>> RP 1.1.1.1 (?), v2v1
>>>> Info source: 1.1.1.1 (?), elected via Auto-RP
>>>> Uptime: 00:36:19, expires: 00:02:22
>>>> Group(s) 224.2.2.2/32
>>>> RP 1.1.1.1 (?), v2v1
>>>> Info source: 1.1.1.1 (?), elected via Auto-RP
>>>> Uptime: 00:36:18, expires: 00:02:21
>>>>
>>>>
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>>>
>>>
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