Miguel
   OpenStack networking-sfc does support SFs with separate ingress and egress 
Neutron ports. A port-pair consists of an
ingress Neutron port and an egress Neutron port. Multiple port-pairs (SFs) with 
similar functionality may be included
in a port-pair-group which is one stage in a SFC (port-chain). Each port-pair 
group provides LB functionality across the SFs in the PPG.
Multiple PPGs make up a port-chain. Networking-sfc supports different back-end 
implementations including OVS, ONOS, ODL.

https://docs.openstack.org/networking-sfc/latest/

 - Louis

-----Original Message-----
From: [email protected] 
[mailto:[email protected]] On Behalf Of Miguel Angel Muñoz
Sent: Monday, November 13, 2017 9:38 AM
To: [email protected]
Subject: [sfc-dev] More than one interface/data plane per SF

Hi everyone
    I have a running demo of ODL with SFC where every SF has one single network 
interface that connects it to one or several chains.

Is it possible to have a SF with two interfaces (egress/ingress) and have the 
traffic in the chain being sent through one of them and received through the 
other?

         +---------+      +---------+
         | Current |      | Desired |
         |         |  =>  |         |
         |         |      |         |
         +---------+      +---------+
              |              |   |
              |              |   |
              +              +   +

             XXX            XXXXXXX
            XX XX          XX     XX
  SC    XXXXX   XXXXX   XXXX       XXXX

The purpose of this is to allow a firewall to be placed as Service Function. In 
this type of devices we need the traffic flowing from one interface to a 
different one. I know this was not possible some months ago, but maybe this 
feature has been already added recently?

I'm also curious to know why this is different to OpenStack + NetworkingSFC + 
ODL: In this deployment openstack allows the SF to have an ingress and egress 
port which can be placed on different interfaces/data plane locator.

Thank you very much,
Best Regards,
Miguel Ángel.


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