RE: [saad] About saad
"J. Noel Chiappa" <jnc@ginger.lcs.mit.edu> Thu, 16 October 2003 16:16 UTC
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Date: Thu, 16 Oct 2003 12:15:53 -0400
From: "J. Noel Chiappa" <jnc@ginger.lcs.mit.edu>
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To: saad@ietf.org
Subject: RE: [saad] About saad
Cc: jnc@ginger.lcs.mit.edu
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> From: "Michel Py" <michel@arneill-py.sacramento.ca.us> >> which are allocated and administered using a topology dependent model, >> implying a service provider dependent model > For IPv4 this is untrue, as PI addresses are not allocated using a > topology dependent model and do not imply a server provider dependant > model. IPv4 tries to make sparing use of PI addresses for *exactly* the same reasons as in IPv6 - too many will overload the routing. The only difference is that with its greater address space, IPv6 has even *more* rope to hang itself with, if it starts handing out PI addresses. >> But we run into problems (the architecture doesn't quite fit when we >> try to address some scenarios encountered in real life: multihoming > Untrue for IPv4. The semantics of IPv4 and IPv6 addresses are basically identical. The only difference is in the number of bits. > The issue with IPv4 multihoming is a scalability issue: the growth of > the routing table (resulting in part from the announcement of > multihomed blocks) induces instability, which is not good. Well, I suppose the eventual "real" IPv6 multi-homing will have fixed this, but if anyone's using "naive" IPv6 multihoming now - i.e. doing it like IPv4 does it, with a PI address (or a chunk of PA address which it advertises globally - the two are indistinguishable technically) - it has exactly the same scaling problem. > Possibly, a protocol other than BGP4+ would have a lot less of a > scalability issue, so I don't consider this an architecture issue. A different routing algorithm/protocol might have a *one-time* improvement in overhead, but in the long run, the curve is going to have the same kind of shape. Having to track too many distinct destinations (which is roughly equivalent to "routing table size") will overwhelm *any* routing architecture. So, it *is* an architectural issue. >> choosing between different identifiers for an object ^^^^^^^^^^^ >> which has different "reachability" and the reachability >> is context-dependent > Shouldn't "identifiers" above be "locators"? I vaguely assume that an > object can have multiple locators but should have only one identifier. It all depends on what is meant by the term "identifier" here. (The document probably needs some editing for precision, etc.) If it means "a name used for end-end identification", it would be a problem; and I would like to understand what the architectural need is for multiple end-end names for a single end-end entity. If it means "address" or "locator", it ought to say so. Noel _______________________________________________ Saad mailing list Saad@ietf.org https://www1.ietf.org/mailman/listinfo/saad
- Re: [saad] About saad Geoff Huston
- RE: [saad] About saad Michel Py
- Re: [saad] About saad James Kempf
- [saad] About saad Michel Py
- RE: [saad] About saad marcelo bagnulo
- RE: [saad] About saad Michel Py
- RE: [saad] About saad J. Noel Chiappa
- Re: [saad] About saad James Kempf
- RE: [saad] About saad Michel Py
- Re: [saad] About saad Fred Baker
- Re: [saad] About saad Brian E Carpenter
- Re: [saad] About saad James Kempf
- RE: [saad] About saad Michel Py
- Why Scopes? (was: Re: [saad] About saad) James Kempf
- Re: [saad] About saad Fred Baker
- Re: Why Scopes? (was: Re: [saad] About saad) Melinda Shore
- Re: [saad] About saad Dave Crocker
- Re: [saad] About saad James Kempf
- Re: [saad] About saad Dave Crocker
- Re: Why Scopes? (was: Re: [saad] About saad) James Kempf
- RE: [saad] About saad Michel Py
- Re: Why Scopes? (was: Re: [saad] About saad) Melinda Shore
- Re: [saad] About saad Stephane Bortzmeyer
- Re: [saad] About saad Erik Nordmark
- Re: [saad] About saad Brian E Carpenter