[e2e] traffic engineering considered harmful

[Erik Nordmark]

> what would be better? what would be better would be to give the users
> a choice - if loose source routing (or strict, or scalelble
> multihoming, or IPv6 GSE) worked well, then users would choose the
> best path for their traffic.

In addition to Randy's point about navigation there is also
the issue that exploring the available paths to find a good or better
path isn't free - it requires sending some number of packets.
And each host will do this exploration independently.

I guess one could envision agents (e.g. in each site) that would do
this type of exploration and be willing to share their information
with hosts in the site. But that raises issues about stale information.

  Erik