[ovs-discuss] [openstack-dev] [OVN] [networking-ovn] [networking-sfc] SFC andOVN

Ryan Moats rmoats at us.ibm.com
Wed Jun 15 04:42:18 UTC 2016

"discuss" <discuss-bounces at openvswitch.org> wrote on 06/14/2016 10:31:40

> From: John McDowall <jmcdowall at paloaltonetworks.com>
> To: Na Zhu <nazhu at cn.ibm.com>
> Cc: Srilatha Tangirala/San Francisco/IBM at IBMUS, "OpenStack
> Development Mailing List \(not for usage questions\)" <openstack-
> dev at lists.openstack.org>, discuss <discuss at openvswitch.org>
> Date: 06/14/2016 10:48 PM
> Subject: Re: [ovs-discuss] [openstack-dev] [OVN] [networking-ovn]
> [networking-sfc] SFC andOVN
> Sent by: "discuss" <discuss-bounces at openvswitch.org>
> Juno,
> It is a container for port-pair-groups and flow-classifier. I
> imagine there could be more the than one port-chain per switch. Also
> we may want to extend the model beyond a single lswitch

I agree that there could be more than one port-chain per switch, determined
by the flow classifier.

What I'm confused by is:

1. Why are items only recorded in logical switches?  I would think
that I could also attach an SFC to a logical router - although I admit
that the current neutron model for ports doesn't really allow that
easily.  Couple that with the change of name from Logical_Port to
Logical_Switch_Port, and I'm left wondering if we aren't better off
with the following "weak" links instead:
-the Port_Chain includes the logical switch as an external_id
-each Port_Pair_Group includes the Port_Chain as an external_id
-each Port_Pair includes the PPG as an external_id
-each Logical_Switch_Port includes the PP as an external_id

I *think* that *might* allow me (in the future) to attach a port chain
to a logical router by setting the logical router as an external_id and
using Logical_Router_Ports to make up the PPs...

2. I still don't see what Logical_Flow_Classifier is buying me that
ACL doesn't - I can codify all of the classifiers given in the match
criteria of an ACL entry and codify the first PPG of the SFC as
the action of the ACL entry...

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://openvswitch.org/pipermail/ovs-discuss/attachments/20160614/7eb8cfc6/attachment-0002.html>

More information about the discuss mailing list