From: Joseph Brunner (joe@affirmedsystems.com)
Date: Tue Feb 12 2008 - 16:23:37 ARST
Urgh...
Dense and sparse mode has NOTHING to do with the packets themselves... they
are all still 224.0.0.0/3 DESTINATION from you guessed it a UNICAST source
ip found in the routing table or the MROUTE table for the rpf check...
The fact the interface is in sparse or dense mode means nothing to a
multicast packet on a interface with a static join... remember, we use the
static join to get the interface into the OIL in the absence of downstream
pim join...
When you put a static join on an interface your going to SEND a PIM join
upstream to GET on the SOURCE TREE. Now how you get on the source tree, well
that's the difference between Sparse mode and Dense mode... Sparse mode will
build a shared tree to the RP, while Dense mode well, will figure things
out...
So You can just run WHATEVER mode you want until a certain point, then do
static joins to downstream interfaces the whole way to the clients...
Pim is smarter than sparse or dense mode... don't forget that...
-Joe
-----Original Message-----
From: Sadiq Yakasai [mailto:sadiqtanko@gmail.com]
Sent: Tuesday, February 12, 2008 12:32 PM
To: Joseph Brunner
Cc: graham@cisco-engineer.com; Graham Clarke; Cisco certification
Subject: Re: Joining Multicast Networks of differeing Types
guys,
so i have been thinking about this and this is what I cant get around
my head...did i little bit of config and still got an invalid log msg.
At some point in trying to achieve what Graham is trying to do, there
has to be a segment on which one side is running sparse mode, while
the other is running dense mode. The two sides would ofcourse form
neigbour relationship (tried) but forwarding of traffic is where the
issue would come up!
The side with dense mode configured wld forward traffic out the
interface, but the side running sparse wld not accept the traffic,
would it?
Hmmm, I wonder if I correctly understood the scenario anyway?
This archive was generated by hypermail 2.1.4 : Sat Mar 01 2008 - 16:54:48 ARST