Communities

Tue Oct 16 15:47:08 UTC 2001

> Date: Tue, 16 Oct 2001 09:55:12 +0100
> From: Kevin Gannon <kgannon at lancomms.ie>

> I've been thinking about other information that could be
> conveyed in communities. For instance, bandwidth, delay and
> packet loss. If each router along the way modifies such a
> community (should probably be an extended one) then a much
> richer set of information would be available to multihomers to
> aid in route selection.

[ snip ]

I'd toyed with the bandwidth idea... let's say that we create
0xffff:1, :2, :3, and :4 to mean sub-T1, T3, OC3, and >= OC12.
Arbitrary and simplified for sake of example.

Whenever a router forwards, it tags with the appropriate speed.
Thus, if :1 is set, you _know_ this path has a sub-T1 link.  Of
course, some places might use bogus tags to try hiding their
connectivity... but an upstream could use a route-map to let
the truth escape.

Thus, with proper administration by upstreams, !set{:1|:2|:3|:4}
would indicate no participants along the way.  However, if this
were to gain momentum among the biggest three dozen ASen, I think
that we'd have a very accurate system.  Even the top one dozen
could do a very good job, considering how many connect directly
to them...

Eddy

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