[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
- To: email@example.com
- Subject: Re: [RRG]
- From: "William Herrin" <firstname.lastname@example.org>
- Date: Sat, 22 Mar 2008 16:50:43 -0400
- Cc: rrg <email@example.com>
- Domainkey-signature: a=rsa-sha1; c=nofws; d=gmail.com; s=beta; h=message-id:date:from:sender:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references:x-google-sender-auth; b=acHDsRqt8Hw2d6B0XgQJS7EOG5xkMfzmWSAtt+h9oXwdyVWR6Fc1wnf87vxiXJnD3IglwGs9TBO/xorl3EoQQBpHtPbC//7RRMA1Rqv6lMFM6X01/a4ACdW0NJ8HuZtcJ9etIsOA6H0zZnPuW/eDMHqTnRPXjLnScFG9Jr8CM4c=
- In-reply-to: <firstname.lastname@example.org>
- References: <email@example.com>
On Sat, Mar 22, 2008 at 1:24 PM, Tony Li <firstname.lastname@example.org> wrote:
> I'd like to turn now to the issue of the dynamics of the mapping function.
> In particular, how fast can we allow the mapping entries to be updated? Do
> we need to constrain the overall flux of the mapping?
> As always, a clear, succinct articulation of the correct questions is more
> valuable than a position statement. ;-)
Here are a couple of questions within that question:
1. Estimate the width of the map system as a function of the number of
contained map entries. Some map systems will have a fixed width (the
ITR always talks directly to the origin map server) while others will
have a variable width (I get my maps from my neighbor who gets them
from his, etc.)
2. As a function of the width of the map system (W) what is the
maximum acceptable time (T) in which a change must be propagated to
all devices who need to know that a change has happened.
2a. What's the maximum acceptable time in which one EID may be
inaccessible to another because of a map change due to a path failure?
2b. What's the maximum acceptable time in which one EID may be
inaccessible to another because of a planned change? BGP handles both
cases the same, which is a pity.
3. What function best describes the relationship between the peak
update rate in the system and the peak update rate in the system's
most heavily loaded device? For example, with BGP a map change at one
leaf will usually require a change across most BGP routers in the
system, so in the worst case its D=S and in the average case it's
somewhere between D=0.9S and D=0.5S.
4. What should the maximum acceptable update rate (updates/minute) be
on the most heavily loaded device (D) in the system?
5. What is the target minimum supported update rate for the system (S)
as a whole?
William D. Herrin email@example.com firstname.lastname@example.org
3005 Crane Dr. Web: <http://bill.herrin.us/>
Falls Church, VA 22042-3004
to unsubscribe send a message to email@example.com with the
word 'unsubscribe' in a single line as the message text body.
archive: <http://psg.com/lists/rrg/> & ftp://psg.com/pub/lists/rrg
- From: "Tony Li" <firstname.lastname@example.org>