[36163] in North American Network Operators' Group
RE: MBone access
daemon@ATHENA.MIT.EDU (Bill Nickless)
Wed Mar 28 17:32:41 2001
Message-Id: <5.0.2.1.0.20010328161231.029556f0@pop.mcs.anl.gov>
Date: Wed, 28 Mar 2001 16:22:15 -0600
To: "Martin, Christian" <cmartin@gnilink.net>
From: Bill Nickless <nickless@mcs.anl.gov>
Cc: "'tme@21rst-century.com'" <tme@21rst-century.com>,
Jared Mauch <jared@puck.nether.net>,
Hank Nussbacher <hank@att.net.il>,
Toerless Eckert <eckert@cisco.com>, nanog@merit.edu
In-Reply-To: <94B9091E1149D411A45C00508BACEB359CD9A1@entmail.gnilink.com
>
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Errors-To: owner-nanog-outgoing@merit.edu
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At 07:30 PM 3/27/2001 -0500, Martin, Christian wrote:
>One of the things that appears to be a major impediment to large-scale
>deployment is the lack of SA transitivity, which is limited by MSDP's RPF
>rules. Therefore, the Internet needs a dense mesh of MSDP peerings to allow
>any-to-any connectivity. As of now, this is not the case. SSM will fix
>this.
>
>regards,
>chris
Two responses, not mutually exclusive:
- The Internet already has a "dense mesh" of BGP peerings. All the
pieces are in place from the major router vendors to turn on
MSDP and PIM-SM at the same places; it seems to me that it's just
a matter of doing it.
- Come on over to the IETF MSDP working group. In Minneapolis I
presented an I-D that would avoid the RPF rules. However, in the
MSDP working group there is very strong resistance to dropping the RPF
rules, because then you can't build an "MSDP traceroute".
My personal response to that is something along the lines of 'there
is no "DNS traceroute" but DNS works just fine anyway, and you just
use other mechanisms to debug it.'
It was agreed in Minneapolis that building an RPF-free MSDP would
be deferred until the current MSDP reaches standard status, and then
we would build MSDPv2 without RPF rules if we thought it was needed.
===
Bill Nickless http://www.mcs.anl.gov/people/nickless +1 630 252 7390
PGP:0E 0F 16 80 C5 B1 69 52 E1 44 1A A5 0E 1B 74 F7 nickless@mcs.anl.gov
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