[c-nsp] Multicast over multiple link

[hjan]

Recently we have upgraded our backbone infrastucture, and we have doubled our pop links.
So the topology change from  :

POP1-R1 ------------------ POP2-R1
POP1-R2 ------------------ POP2-R2

to

POP1-R1 ========= POP2-R1
POP1-R2 ========= POP2-R2

with double pop link.

In fact on our network we use pim-sm and we transmit iptv channel, that  are split over the two logical path pop1-r1/pop2-r1 and pop1-r2/pop2-r2.
Now watching our report system I've seen some performance degradation over video quality.
Some of my collegue think the problem is the double link in conjunction with igmp dynamic join that come from our juniper erx, act as dsl concentrator, other think
is the previously ios upgrade to 12.0(32).S3.

Does anyone have ideas ?

Thanks,
hjan