All things related to multicast

[Bill Owens <>]

IIRC the decision of whether to use unicast or multicast reachability for RPF 
checks is different per vendor, and at least sometimes configurable. Juniper 
always wanted multicast, Cisco would use multicast but fall back to unicast. 
Maybe. That's a very old memory.  

Anyway, I haven't cleaned up multicast BGP yet since that's pretty invasive, 
but I have torn out PIM from all the client ports and some of the backbone, 
along with IGMP/MLD. The other day I ran into an interface complaining about 
MLD version mismatch and it was oddly satisfying to just delete the protocol 
entirely instead of having to fix it.

Bill.

On 8/28/20, 9:44 AM, " on behalf of 
Michael H Lambert" < on behalf of 
> wrote:

    A point which has never been completely clear to me (since I admit to
    having thought about multicast as little as possible the past decade) is
    whether the multicast SAFI is still needed when doing SSM.  RFC 8815
    doesn't mention this, but RFC 8313 (BCP for SSM) suggests it may still
    be needed.  I had thought it was just used for ASM RPF checking, but I
    could be mistaken.

    Michael

    Bill Owens wrote on 2020-08-28 06:15:
    > That's because you're doing a (*,G) join to the dirges stream. 
    > 
    > (In another age I would have set up a loop of dirges on a utility 
machine somewhere, but I've already ripped most of the multicast config out 
of our network. All inter-domain multicast is deprecated.)
    > 
    > Bill.