Sparse mode multicast ?

From: kevin gannon (kevin@gannons.net)
Date: Tue Nov 01 2005 - 16:46:16 GMT-3


Have a simple set with three routers

R2--------R5(RP)--------R3

Its running all sparse mode. R2 has an igmp join statement
for 225.25.25.25 and R3 is sending a ping to this group
source from 35.35.35.3. Below is the mroutes I see on R3
the source of the stream. I am experimenting with set the
spt threshold to infinity on R3 below is the different mroute
outputs:

Default setup no SPT threshold changed
####################################################
(*, 225.25.25.25), 00:36:46/stopped, RP 5.5.5.5, flags: SJPCL
  Incoming interface: Serial0/1, RPF nbr 35.35.35.5
  Outgoing interface list: Null

(35.35.35.3, 225.25.25.25), 00:05:20/00:02:59, flags: PLT
  Incoming interface: Serial0/1, RPF nbr 0.0.0.0, Registering
  Outgoing interface list: Null

(*, 224.0.1.40), 00:37:22/stopped, RP 5.5.5.5, flags: SJPCL
  Incoming interface: Serial0/1, RPF nbr 35.35.35.5
  Outgoing interface list: Null

SPT Threshold set to infinity
###################################################

(*, 225.25.25.25), 00:40:15/stopped, RP 5.5.5.5, flags: SPCL
  Incoming interface: Serial0/1, RPF nbr 35.35.35.5
  Outgoing interface list: Null

(35.35.35.3, 225.25.25.25), 00:08:49/00:02:58, flags: PLT
  Incoming interface: Serial0/1, RPF nbr 0.0.0.0, Registering
  Outgoing interface list: Null

(*, 224.0.1.40), 00:40:51/stopped, RP 5.5.5.5, flags: SPCL
  Incoming interface: Serial0/1, RPF nbr 35.35.35.5
  Outgoing interface list: Null

My questions:
1. Why do I not see any outgoing interfaces in either output
    for (35.35.35.3, 225.25.25.25),

2. In the default SPT setup how come I see the "Registering"
    going on and on and on.....

Thanks & Regards
Kevin



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