All things related to multicast

[Yuri Kolomiyets <>]

Pekka Savola wrote:
> HP is sending the Cisco an (S,G, rpt) prune i.e. "I don't want that to 
> receive back from RP the transmission from sources that we already see 
> directly" -- and Cisco as a consequence deletes the state.
>
> The next PIM join however has S-bit (shortest path tree set).
That's exactly what I was thinking. Seems like HP tries to switch from 
RP tree to SP tree. The only problem is that RP tree and SP tree are the 
same since traffic goes through RP because of topology, not because tree 
is built that way. So somehow HP can't understand it and keeps trying to 
switch over and over again.

> Does the Cisco have (S,G,spt) state active towards HP when HP sends 
> the prune?  
Yes, Cisco is in the SP State.

> What about the HP (I'm not sure if it's possible to get this much 
> detail from it though)?  If not, maybe HP sending the RPT-prune and 
> SPT-join in a wrong order, i.e., it should send the SPT join first.
Unfortunately there's no info like that that I can get from HP. The only 
configuration there is is SPT switch enable or disable. If I disable 
switching to SPT, stream stops working at all.

--
Yuri Kolomiyets

Network Services
Information Systems & Technology
University of Waterloo

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