Re: Segment Routing

[steve ulrich <sulrich () botwerks org>]

fwiw - there's a potentially significant loss of visibility w/SR from a
traffic management perspective depending on how it's deployed.  though, i
doubt the OP is really driving at this point.

the data plane behavior on LDP is swap oriented, while the data plane on SR
is pop oriented.  depending on the hardware capabilities in use this may
have (subtle) traffic engineering or diagnostic implications at a minimum.
folks will likely have to build tooling to address this.

we're pushing the bubble of complexity around.

On Tue, May 22, 2018 at 8:47 AM Saku Ytti <saku () ytti fi> wrote:

> On 22 May 2018 at 11:19, Matt Geary <matt.geary () gmail com> wrote:
>
> > really seeing the value of SR to replace LDP on my backbone. With some
> > scripting and lots of software tools I can make it just like LDP, but
> why?
> > So break the ease of LDP just to get label switching on my hub core not
> > really seeing it, unless someone has done it and they are seeing the
> value.
>
> Can you elaborate what scripting and software tools are needed? If you'd
> talk
> about RSVP particularly AutoBW and SR, then yeah, but SR on itself should
> be less of a chore than LDP.
>
> SR is what MPLS was intended to be day1, it just wasn't very marketable
> idea
> to sell MPLS and sell need for changing all the IGPs as well.
> LDP is added state, added signalling, added complexity with reduced
> visibility.
> SR is like full-mesh LDP (everyone has everyone's label POV), while also
> removing one protocol entirely.
>
> --
>   ++ytti


-- 
steve ulrich (sulrich@botwerks.*)