From: Antonio Soares (amsoares@netcabo.pt)
Date: Fri Jun 15 2007 - 10:05:55 ART
Hello Kyle,
Yes, Bidir seems the best option. I think no (S,G) entries will be created
even if the RP goes away.
Regarding the "ip pim spt-threshold infinity", we have the same
understanding of the behaviour. Only (*,G) entries from the RP towards the
receivers.
Now i only need to understand better in which scenarios the "no ip pim
dm-fallback" should be used.
Regards,
Antonio
-----Original Message-----
From: Kyle MacDonald [mailto:Kyle.MacDonald@pwgsc.gc.ca]
Sent: sexta-feira, 15 de Junho de 2007 13:43
To: Antonio Soares; ccielab@groupstudy.com
Subject: RE: Avoiding (S,G) Entries
Hi Antonio,
I'm clearly not very strong on Bidir. Reading up on it, it looks like Bidir
is the best solution here. Did the requirement ask you to consider the
scenario of the RP becoming unavailable? If not, I think that Bidir meets
the requirement and is the simplest solution.
Kyle
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Antonio Soares
Sent: Friday, June 15, 2007 7:45 AM
To: ccielab@groupstudy.com
Subject: RE: Avoiding (S,G) Entries
Hello group,
Any takers to this ?
I understand that with PIM-BIDIR no (S,G) entries are created. But when the
RP becomes unavailable, i assume that PIM will fallback from SM to DM. Maybe
not, if all the interfaces are configured as PIM-SM only. So i see the the
combinations that follow in order to avoid any (S,G)
entries:
- PIM-BIDIR + all PIM interfaces configured in SM only.
- PIM-SM + interfaces configured in SM-DM + no ip pim dm-fallback
The command "ip pim spt-threshold infinity" does not resolve the problem in
the path from the RP upstream to the Source. At least one router will have
an (S,G) entry.
Thanks,
Antonio
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Antonio Soares
Sent: sexta-feira, 15 de Junho de 2007 1:24
To: ccielab@groupstudy.com
Subject: Avoiding (S,G) Entries
Hello group,
I have some problems with the task wording when it calls to avoid (S,G)
entries in the Mcast Routing Table.
I see 3 options and i would like to have your inputs regarding the different
behaviours we get with each command:
- ip pim bidir-enable and ip pim rp-address x.x.x.x bidir
- no ip pim dm-fallback
- ip pim spt-threshold infinity
Thanks,
Antonio
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