[j-nsp] IPv6 multicast -- stuck in spt-pending

[Daniel Roesen]

Hi,

Uplink ---Tunnel--- R1 --- R2 --- R3 --- R4 --- R5 --- Host

R1+R2: Juniper
R3-R5: Cisco

Host sends MLDv1 (*,G) join towards DR R5. R5 sends PIM (*,G) join
to RP. This join is forwarded from R5 to R1 and further. R1+R2 now
show:

Group: ff3e:20:2001:660::beac
    Source: *
    RP: 2001:660:3007:300:1::
    Flags: sparse,rptree,wildcard
    Upstream interface: ip-1/3/0.1

Uplink starts sending multicast traffic on this group down the tunnel
to R1, which gets forwarded down to R5. R5 then joins each detected
source with PIM (S,G) joins. Those get forwarded again up to the Uplink.

At this point, both Junipers R1 and R2 do show:

Group: ff3e:20:2001:660::beac
    Source: 2001:468:901:1:250:daff:fe20:5b03
    Flags: sparse,spt-pending
    Upstream interface: ip-1/3/0.1

for each (S,G). Traffic is STILL coming in, and RPT == SPT, so R1 and R2
should _immediately_ conclude that they are active on the SPT and should
change state from "spt-pending" to "spt". Unfortunately that doesn't
happen.

Smells like a bug to me. Tried with 7.1R1 and 7.0R2.

This group has some 14 sources, so am I triggering PR 55948?


Best regards,
Daniel

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