Re: [homenet] draft-boutier-homenet-source-specific-routing-00

[Juliusz Chroboczek <[e-mail]>]

> I'm afraid I'm having a difficult time parsing the sentence, "First,
> since a router only controls the next hop, a route can only be
> selected by the network if it has a selected route as its suffix,
> which makes some forms of global optimisation difficult or
> impossible."

Consider the following topology:

           C
          / \
         /   \
   A -- B     S
         \   /
          \ /
           D

Suppose that B routes packets to S through C; then there is no way
that A can possibly route its own packets to S through D.

What happens here is that the route ABDS cannot be selected because
nobody has selected its suffix BDS.  This limitation doesn't occur
with e.g. source routing or circuit switching.

> [ Section 2.2.2, last paragraph ]
> 
> "which in turn will send it back to B" --> "back to C", if I'm reading
> things correctly.
> 
> [ Section 5, paragraph 2 ]
> 
> I do not think you mean to say that OSPF/IS-IS are both distance
> vector and link state "within" areas.  I think you mean
> s/within/(between|among)/ somewhere in there.

Noted, thanks.

-- Juliusz