Re: Advertisement Protocol -- more thoughts

[brad cain <bcain@mediaone.net>]

Stephen Thomas wrote:
> 
> At 12:29 PM 2001-01-05 -0500, brad cain wrote:
> 
> >URL Exchange Protocol (proxy case)
> >----------------------------------
> >This protocol exchanges a list of urls and a set of metrics with
> >each set.  This protocol is used to communicate metrics to proxies or
> >transparent proxies.  An example would be a CDN advertising
> >
> >"Content AS": 2
> >url: http://www.blah.com/images
> >nexthop: surrogate 1
> >metric: 10
> 
> Can Brad (or anyone else) help me understand what nexthop and metric are in
> this case?

The next hop would be a useful for either layer-7 switches or
proxies... it would work very much like a BGP next hop which would
specify the specific surrogate that had the content (in cases
where the advertisement wasn't coming directly from the
surrogate itself).

The metric is a "generic metric" which is negotiated between
cdns... I personally don't believe we can come to agreement
on a set of metrics (e.g. delay, etc) at this point both
because it is extremely hard (just look at layer-3 qos)
and because nobody would ever agree anyway... 

-brad