From: mgreenlee@ipexpert.com
Date: Thu Apr 03 2008 - 18:53:42 ART
ftp://ftp-eng.cisco.com/ipmulticast/training/
Check out module 5 - sparse mode configuration
5 - pg 8 "...'Register Stop' to the source's first hop router to inform it
that it can stop sending the unicast Register messages..."
7 - pg 10 "...If this were not done, (S,G) traffic would continue flowing
down the Shared tree resulting in duplicate (S,G) packets arriving at the
receiver..."
Q also - last hop router near receiver.
Marvin Greenlee, CCIE #12237 (R&S, SP, Sec)
Senior Technical Instructor - IPexpert, Inc.
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-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Peter
Sent: Thursday, April 03, 2008 4:59 PM
To: ccielab@groupstudy.com
Subject: SPT | Source Distribution tree | spt-threshold
Dear GS,
In the config guide of Multicast (section large deployment IOS 124).
I'm not able to understand the process of switching from shared tree to
source distribution tree.
====
5. When data arrives natively (through multicast) at the RP, the RP sends a
register-stop message to Router A. >> why? Because the source shouldn't send
through the network unless the RP has registered clients for the multicasted
group (I'm assuming)?
6. By default, reception of the first data packet prompts Router C to send a
Join message toward the source. >> OK
7. When Router C receives data on (S, G), it sends a Prune message for the
source up the shared tree >> WHY, cz it will use the source distribution
tree from that moment on?
8. The RP deletes the link to Router C from the outgoing interface of (S,
G). The RP triggers a Prune message toward the source.
====
Q also: Where exactly shall I apply an infinite spt-threshold to prevent SPT
switching? On the client router (host router) right?
Thanks,,,,,
Cheers,
Peter
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