From: Anthony Sequeira (asequeira@internetworkexpert.com)
Date: Sun Jan 11 2009 - 19:15:55 ARST
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.
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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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