From: null void (nullv0idmain@yahoo.com)
Date: Fri Feb 04 2005 - 13:46:24 GMT-3
Thanks for the reply... I will read that section but on the docCD
http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/fipr_c/ipcpt3/1cfmulti.htm#21887
the way they are explaining it is that the purpose of "ip pim nbma-mode" is for efficiency of the link . So if your Multipoint Hub interface running ip pim sparse-mode .. Has its framerelay interface maps configured with broadcast feature on each map statement to say 4 spoke routers... ip pim nbma-mode reduces unneed traffic so if only spoke1 requested to join a group , ip pim nbma-mode will when receiving traffic for that group send it to that one neighbor who requested it not to the other 3... But you are saying that if one of the other spokes was receiving the stream earlier but then sent a request to stop sending the stream then all spokes will now not receive the multicast stream ?? What if your in a situation in which out of 3 spokes only 1 of those spokes has multicast enabled the other 2 do not have any muliticast configured on them at all , at that point it would not be needed then correct ? Your saying that if multiple spokes are joined to a group , then one of t!
hem says
stop , it affects all spokes becuase they are all connected into the HUB routers physical interface ??
Null..
Labcciee <labccie@uol.com.br> wrote:
Hi,
The "ip pim nbma-mode" must be configured on subinterfaces running frame
relay multipoint mode.
It's required because without it, with the reouter receives a prune message
on the phisical interface it could cut off the multicast traffic for all
others subinterfaces. This explanation is on the CCIE Practical Studies
volume II
----- Original Message -----
From: "null void"
To:
Sent: Friday, February 04, 2005 2:18 PM
Subject: Requirement details of "IP PIM NBMA"
> Say we have the following topology:
>
> R1 - is the hub of frame relay hub-spoke toplogy. Serial 0/0.1 multipoint
goes to 2 spoke routers R2 , R3. Serial 0/1.1 point-to-point goes to R6's
S0/1 this is frame-relay circuit also
>
> R6 - is a standalone stub router with a point to point serial sub
interface off of Ser0/1 to R1's S0/1
>
> R3 - Ser0/0 physical interface connects into R1 the frame relay hub
router's s0/0.1 multipoint so R3 , R2 and R1 are all layer 3 reachable on
same ip subnet in hub spoke topology.
>
> If we configure say R3 as RP on its loopback 0 interface for all groups.
Then configure ip pim sparse-mode on all interfaces of R3 , R6 , R1 . So now
R3 , R6 and R1 see each other as pim neighbors and the RP is found being
hardcoded to R3 loopback . Is IP PIM NBMA mode required on R1's S0/0.1
multipoint and s0/1.1 point to point interfaces ?? Without it I can still
from all multicast enabled routers , in this case being R3 , R6 and R1 ping
the groups that we configured onto R6's Loopback 0 interace via the ip igmp
join-group x.x.x.x command so it is working ... But my question is when is
ip pim nbma requried and why ??? Any resources / docs on this would be
greatly appreciated... TIA Null
>
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