From: CCIEin2006 (ciscocciein2006@gmail.com)
Date: Mon Feb 27 2006 - 15:24:41 GMT-3
Hi Bob,
Since the first hop routers forward the traffic whether its wanted or not,
isn't that like dense mode?
Do receivers still send joins to the RP?
What does the RP do with the traffic if there are no receivers - send a
prune?
Thanks!
On 2/27/06, Bob Sinclair <bob@bobsinclair.net> wrote:
>
> Bidirectional PIM Differs from Sparse mode in at least these ways:
>
> Bidir does not maintain any (S,G) state. Only (*,G) state. This is what
> makes it scalable for many-to-may multicast.
>
> Bidir does not do PIM registration. First-hop routers do not register
> traffic with the RP. First hop routers, forward traffic for active groups
> toward the RP, whether anyone wants the traffic or not, as long as the
group
> is active.
>
> Since there is no PIM registration, the RP does not actually have to be a
> reachable address, only a reachable network that acts as a root.
>
> Here is a link with more info:
>
>
>
http://www.cisco.com/en/US/products/sw/iosswrel/ps1835/products_configuration
_guide_chapter09186a00800ca796.html
>
>
> HTH,
>
> Bob Sinclair
> CCIE #10427, CCSI 30427
> www.netmasterclass.net
>
>
> ----- Original Message -----
> *From:* CCIEin2006 <ciscocciein2006@gmail.com>
> *To:* ccielab@groupstudy.com
> *Sent:* Monday, February 27, 2006 11:28 AM
> *Subject:* Difference between Bidirectional PIM and PIM Sparse Mode
>
>
> Hello group,
>
> I am not very clear on the differences between Bidirectional PIM and PIM
> Sparse Mode. Both use the RP and switchover to shortest path tree after
> the
> first packet is received, correct?
>
> How do they differ exactly?
>
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