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07-14-2022
11:42 AM
- last edited on
07-18-2022
07:19 AM
by
Translator
Say I have a environment runs PIM SPARSE-DENSE mode currently with
autoRP configured
(but no router has ip pim autorp listener configured). I need to add new L3 device into this environment and replace the existing RP router. But the challenge is that the new L3 device can only do PIM SPARSE mode...So I need to migrate existing PIM Sparse-dense mode to sparse mode in order to put in the new L3 device as the new RP, right?
If so, do I just need to add
ip pim autorp listener
on all the PIM routers? Or I would have to manually add
ip pim autorp listener
as well as change
ip pim sparse-dense-mode to ip pim sparse-mode
for every PIM routers' interfaces?
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07-14-2022
09:02 PM
- last edited on
07-18-2022
07:32 AM
by
Translator
Hi
ip pim autorp listener
is required if you have interfaces running
ip pim sparse-mode
. In your case you need it on the new L3 device. Your other devices are running interfaces in sparse-dense mode and do not need
ip pim autorp listener.
If you would like to migrate the other devices to pim sparse mode, then you will need to add the
ip pim autorp listener
on all the other devices.
Thanks
John
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07-14-2022
07:26 PM
- last edited on
07-18-2022
07:21 AM
by
Translator
Hi,
You need the
ip pim autorp listener
on the device operating in pim sparse mode. In your case, this will be on the 'new L3 device'
Thanks
John

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07-14-2022
08:03 PM
- last edited on
07-18-2022
07:27 AM
by
Translator
Thanks for the info but maybe I was not clear in the post. I would need to use the new L3 device to replace the current RP...
I will have
ip pim send-rp-announce and ip pim send-rp-discovery configured
on the new L3 device with all the interface as sparse-mode. I do think I need to have all the remaining PIM routers added with
ip pim autorp listener
as their interfaces are all in sparse-dense mode. But just not sure if this would actually work...
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07-14-2022
09:02 PM
- last edited on
07-18-2022
07:32 AM
by
Translator
Hi
ip pim autorp listener
is required if you have interfaces running
ip pim sparse-mode
. In your case you need it on the new L3 device. Your other devices are running interfaces in sparse-dense mode and do not need
ip pim autorp listener.
If you would like to migrate the other devices to pim sparse mode, then you will need to add the
ip pim autorp listener
on all the other devices.
Thanks
John

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07-15-2022
08:31 AM
- last edited on
07-18-2022
07:35 AM
by
Translator
So my understanding of the
ip pim autorp listener
function might be wrong...I thought that command is only for the non-RP pim routers in a sparse-mode multi-cast environment. I guess it is actually for all the PIM routers if they are only running sparse-mode in the network, right?
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07-17-2022 05:34 PM
Hi,
Yes, you will only need it when you have interfaces running pim sparse-mode.
Thanks
John
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07-17-2022
03:43 AM
- last edited on
07-18-2022
07:37 AM
by
Translator
Hello
If sparse-dense mode isnt applicable then you can just statically apply a RP maping to each rtr and you should be good to go.
ip pim rp-address x.x.x.x
Please rate and mark as an accepted solution if you have found any of the information provided useful.
This then could assist others on these forums to find a valuable answer and broadens the community’s global network.
Kind Regards
Paul
