All things related to multicast

[Yuri Kolomiyets <>]

Hi All,

We're having some troubles with PIM between Cisco and HP. Everything 
works fine, except any stream freezes for 1 second every minute. We 
traced it back to the periodic join/prune updates coming from HP which 
contain a (S,G) prune for the active stream. Then 1 second later the HP 
sends a join for the same (S,G).
Here's debug from the cisco side:

*Mar  4 00:21:49.849: PIM(0): Received v2 Join/Prune on 
GigabitEthernet1/0/24 from 10.0.0.2, to us
*Mar  4 00:21:49.849: PIM(0): Join-list: (*, 239.255.100.100), RPT-bit 
set, WC-bit set, S-bit set
*Mar  4 00:21:49.849: PIM(0): Update GigabitEthernet1/0/24/10.0.0.2 to 
(*, 239.255.100.100), Forward state, by PIM *G Join
*Mar  4 00:21:49.849: PIM(0): Prune-list: (10.0.3.2/32, 239.255.100.100) 
RPT-bit set
*Mar  4 00:21:49.849: PIM(0): Prune 
GigabitEthernet1/0/24/239.255.100.100 from (10.0.3.2/32, 
239.255.100.100) - deleted
*Mar  4 00:21:50.848: PIM(0): Received v2 Join/Prune on 
GigabitEthernet1/0/24 from 10.0.0.2, to us
*Mar  4 00:21:50.848: PIM(0): Join-list: (10.0.3.2/32, 239.255.100.100), 
S-bit set
*Mar  4 00:21:50.848: PIM(0): Add GigabitEthernet1/0/24/10.0.0.2 to 
(10.0.3.2, 239.255.100.100), Forward state, by PIM SG Jon


This is happening in our production network, as well as a little lab we 
set up to test this. The lab setup is a 3750 Cisco and a 3500 HP with 2 
laptops connected to each switch. If anyone interested in the lab 
configs, I posted them here:
http://ist.uwaterloo.ca/~ykolomiy/multicast-lab-configs.txt

If anyone has any idea why this might be happening and what we can do to 
fix it, we'd really appreciate it.

Thanks a lot,

Yuri Kolomiyets

Network Services
Information Systems & Technology
University of Waterloo

E-mail: 

Phone: (519) 888-4567 x36999