Re: [pim] Replacing unicast BSMs with multicast

[John Zwiebel <jzwiebel at cisco.com>]

I would guess that in a service provider environment, the
use of a static-RP is much preferred.  When you say anycast-RP

I'm also guessing that it probably an MSDP anycast system vs
a PIM anycast.

Within an enterprise, I'll bet there is more auto-rp deployed than
either static-RP or BSR (but that depends on that enterprise having
cisco routers only of course).

Since we don't often get a look into the same customer network,
our subjective analysis of which RP distribution method is most used
will probably be very skewed, so much so that I'm not sure it is useful
argue about which vendor has what method most broadly deployed.

At this point of mcast deployment, it is my opinion -- based on nothing
in particular -- that very few, if any, networks have more than one RP
address (where anycast-rp is "one RP") or have RPs that support  
different
group ranges. (certainly in the ISP case this is true)

However, we are on the verge of video making the transition to IP and
I predict this means more RPs with a rapid convergence on SSM to avoid
setting up any shared-trees, especially in the ISP environment.

And in the enterprise, IFF sparse-mode survives, there will be a lot
of RPs serving a variety of group ranges.

Or, with more bidir, there
will be the need to set up RPs for many temporary groups, and since the
RP in bidir doesn't actually -do- anything, there -might- be a smart
way of determining the receivers in the group and allocating an RP
address in the center of those receivers rather than trying to
set it up in advance.

If I'm correct, the ability of the BSR to quickly distribute RP  
information
will become very useful.  (This also assumes the withering of Dense-mode
since the BSR protocol doesn't have an easy way of identifying a 'hole'
to be reserved for dense groups, auto-RP does, but 'who cares'? ;-)



On Apr 26, 2006, at 9:37 AM, Leonard Giuliano wrote:

> On Wed, 26 Apr 2006, Cao Wei wrote:
>
> -) Hi, John
> -)    I can not give the accurate number that how many PIM routers  
> are running in the network.
> -) But as I know,  BSR/BSMs is more popular static RP. A colleague  
> has years experience
> -) on network deployment  agree with me.
> -)
>
> I would respectfully beg to differ.  Static Anycast RP has been the  
> choice
> of nearly every deployment I have seen.  In fact, I see absolutely  
> no use
> for BSR, and would love to see it deprecated.  Unless you prefer more
> complexity and less functionality, Static Anycast RP has all the  
> benefits
> and lacks some of the disadvantages of BSR.
>
> The only place I have seen BSR deployed is where certain equipment
> actually supported only BSR and somehow didn't allow static RP  
> (even when
> the RP was some other box).

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