[c-nsp] PIM register-source command for IOS XR

[John Neiberger]

I have a use case where I really need to force some ASR9Ks to use their
loopback addresses as the source for PIM register messages but there
doesn't seem to be a way to do it. I've checked up to version 5.2 and there
doesn't seem to be a command to do this like there is in IOS.

Do any of you know a way to do this?

Thanks,
John