nanog mailing list archives
Re: consistent policy != consistent announcements
From: Tony Li <tli () jnx com>
Date: Sun, 16 Mar 1997 22:58:48 -0800 (PST)
2) generally speaking, BGP path length is too blunt an instrument. More fine-grained control is needed to allow peers to fine-tune balance of their interests. I'm sorry to be too naive, but i'm repeating that for years and nobody seems to agree that BGP needs real metrics. How come? Well, for several reasons. First, any such proposal should have a reasonable architecture. Not just a description of the mechanism. Motivational explanations are most welcome, preferably sprinkled with real world examples. Second, there's the issue of the consistency of the values used. As I recall your proposal, each domain in the path would propose a metric for its contribution for a prefix. A receiving domain then weighted each domain in whichever way it chose to arrive at a final, composite metric. Thus, the semantics of the metric are hardly clear. Third, there's the pragmatic issue of implementation cost. Yes, the cost of an integer per AS in an AS path is tolerable, tho not "cheap". This cost becomes painful if most domains are not using the metric. And it becomes more painful if two prefixes with otherwise identical attributes have different metrics. This results in them not landing in the same update, thereby increasing overhead. Are we willing to take a signficant step forward in overhead for this flexibility? Tony - - - - - - - - - - - - - - - - -
Current thread:
- consistent policy != consistent announcements Randy Bush (Mar 12)
- Re: consistent policy != consistent announcements John W. Stewart III (Mar 13)
- <Possible follow-ups>
- Re: consistent policy != consistent announcements Vadim Antonov (Mar 13)
- Re: consistent policy != consistent announcements Tony Barber (Mar 13)
- Re: consistent policy != consistent announcements Randy Bush (Mar 13)
- Re: consistent policy != consistent announcements Tony Li (Mar 16)
- Re: consistent policy != consistent announcements Sean Donelan (Mar 13)
- Re: consistent policy != consistent announcements Randy Bush (Mar 13)
- Re: consistent policy != consistent announcements John Scudder (Mar 13)
- Re: consistent policy != consistent announcements Vince Fuller (Mar 13)
- Re: consistent policy != consistent announcements Henry Kilmer (Mar 13)
- Re: consistent policy != consistent announcements David Schwartz (Mar 13)
- Re: consistent policy != consistent announcements the Riz (Mar 13)
- Re: consistent policy != consistent announcements Henry Kilmer (Mar 13)
- Re: consistent policy != consistent announcements Vince Fuller (Mar 13)
- Re: consistent policy != consistent announcements Henry Kilmer (Mar 13)
- Re: consistent policy != consistent announcements Vince Fuller (Mar 13)
(Thread continues...)