From: Yazan Mughrabi (m_yazan@hotmail.com)
Date: Sun Dec 02 2007 - 02:26:23 ART
Hello All,
Is there is a relationship between the location of the RP for multicast and
the DR for a particular segment of multicast. What I have noticed is that
inorder for sparse mode multicast to work with and RP you have to have the
router which is closest to the RP act as the DR for that segment. Also I have
noticed that this only applies it seems when you are talking about a FR
segment.
Example:
For R1 to be able to ping a group which R5 has joined, R2 has to be the DR for
the segment inbetween R2 and R1. After R2 is the DR R1 will be able to ping
until I clear the Mroute of R2.
However between R2 and R3 it seems it does not matter who is the DR for that
segment.
R5 <----Serial------> R4 <----Ethernet------> R3 <----Ethernet------> R2
<--Serial--> R1
When R1 is segment DR:
(2.2.13.2, 224.30.30.30), 00:00:20/00:02:58, flags: PT
Incoming interface: Serial1/0, RPF nbr 0.0.0.0
Outgoing interface list: Null
When R2 is segment DR:
(200.0.12.2, 224.5.5.5), 00:01:28/00:03:20, flags: FT
Incoming interface: Serial1/0, RPF nbr 0.0.0.0
Outgoing interface list:
Ethernet0/1, Forward/Sparse-Dense, 00:00:37/00:02:52
Any light on the matter will be highly appreciated.
Thanks in advance,
Yazan
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