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From: Giuseppe (Pino) de Candia [mailto:gdecandia at midokura.com]
Sent: Saturday, October 31, 2015 10:08 PM
To: Cathy Zhang
Cc: Henry Fourie; OpenStack Development Mailing List (not for usage questions); Irena Berezovsky
Subject: RE: [openstack-dev] [neutron][networking-sfc] API clarification questions

>
> Cathy> No restriction as long as the ports are routable. Originally we think we need to specify L2 and L3 service type. But later we found out it is not needed if we program the switch to set the next hop destination to the service function’s MAC. This way no matter whether it is L2 or L3, it always works.
>

Hi Cathy, my understanding is that:
-for an L2 service, don't modify the packet (ignoring possible encapsulation to signal policy )
-for an L3 service, set the dst MAC in the packet equal to the the service port's MAC

How can the SDN implementation know which kind of service it's dealing with to decide whether to modify the MAC?

Cathy> You can always modify the MAC which will work for both L2 and L3 service.

Thanks,

Cathy
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