From: Josef A (josefnet@gmail.com)
Date: Sat Dec 03 2005 - 12:46:10 GMT-3
Thought of a tunnel between R2 and R3 ?
Josef
On 12/2/05, Venkataramanaiah.R <vramanaiah@gmail.com> wrote:
>
> Hi,
>
> I have the following FR topology..
>
>
> ______R2_____R4
> /
> R1--
> \______R3_____R5 (239.5.5.5)
>
>
> I have PIM Sparse mode running everywhere.. and of course with PIM nbma
> mode at R1.
>
> R2 is the RP and R1 is the MA. R5 has joined some group, Say
> 239.5.5.5(Will call this Grp5 henceforth).
>
> There are two issues in this topology. Let me discuss them one by one.
>
> 1) When R5 sends PIM join to the RP (R2) via R3, the joins are sent
> directed
> to R2 from R3. This prevents the join to become successful. We can fix
> this
> by adding a static mroute at R3 for the RP pointing to R1. THis will let
> the
> shared tree to be built from the RP R2 via, R1-R3 and the receiver R5.
> Hope
> there are no other solutions for this problem.
>
> 2) When we ping the Grp5 from R4, the packets would reach the receiver for
> a
> while. After sometime, the last hop DR (i.,e R5) tries to switchover to
> SPT
> and this breaks the multicast flow in the FR cloud. We can probably fix
> this
> by using SPT threshold infinity at R5. Then the traffic would flow
> smoothly
> to R5. The main issue that i am unable to address is when we have some
> group
> say Grp3 joined at R3 and if we ping this group from R2. In this case,
> setting spt-threshold infinity at R3, does not seem to help. Since the
> source is on the same network address in the FR cloud, the ping works for
> a
> while through the shared tree via R1, but after sometime, R3 seem to be
> tearing down the source tree because it thinks the source is directly
> connected and it stops the mulitcast flow for a while. I am sure you guys
> would have faced this issue, so I am wondering if there is any solution
> for
> this problem..
>
> Thank you
> -Venkat
>
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