Segment Routing
steve ulrich
sulrich at botwerks.org
Tue May 22 14:43:33 UTC 2018
sorry, yes. i was referring to SRTE wrt the pop operation.
in most of the implementations i've poked at, there is the ability to
specify a consistent label range, but it's not always the case. SIDs are
not labels but they are encoded as labels. i hope operators have the
option to configure common/consistent label ranges, but i don't necessarily
assume it. tooling to resolve this will be required just as in the LDP
world.
On Tue, May 22, 2018 at 9:19 AM Saku Ytti <saku at ytti.fi> wrote:
> Hey Steve,
>
> > 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.
>
> I think you're thinking of SR-TE, SR in normal LDP-like use case would be
> single
> egress label with swap on LSRs.
>
> Ingress PE would figure out label by using egress PE index as an
> offset to next-hop
> P's label range.
> Nexthop P would swap the label determining out label using same mechanism.
>
> I practice operators would configure same label range in every box, so
> swap would be
> from same label to same label. But that is purely due to operator
> configuration, and
> it's still swap.
>
> --
> ++ytti
>
--
steve ulrich (sulrich at botwerks.*)
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