Netvirt devs,
Does Manuel's approach sound reasonable to the Netvirt community?
As Manuel mentioned, the Netvirt SFC classifier rules are only populated
on compute nodes where there is a service function (hence where there is
a SFF). So if we have a configuration where the client VM is on computeA
and all the SFC entities (SFs and SFF) are on computeB, then there will
be no classification rules on computeA, and the VM on computeA cant use SFC.
What do you think would be better?
* populate classification on every compute node
o this may not be possible if no VMs exist on some computes
* populate classification on every compute that has a VM
o the trigger would be VM creation
Thanks,
Brady
On 13/12/16 15:31, Manuel Buil wrote:
Hi guys,
While debugging some problems in SFC OPNFV, we found out that there is
a special case where the current implementation of ODL does not work:
if the client does not share the compute host with a SF. Observing
netvirt code, it can be seen that it implements flows in the compute
nodes which are part of the RenderedServicePathHopList, i.e. compute
nodes which are considered SFFs. However, in the case I mentioned, the
compute node where the client sits is not part of the
RenderedServicePathHopList and therefore, the method
NetvirtSfcWorkaroundOF13Provider.handleRenderedServicePath does
nothing in that compute. As a consequence, the classification rules
are not implemented in that compute node (the vxlan-gpe interface either).
Probably we should discuss how to fix this but one solution could be
implementing the classifier rules and the vxlan-gpe port in all
computes. This would be ok if the defined ACL just says for example
the tcp port. However, if it also specifies information related to the
traffic source (e.g. source IP, mac…) maybe there could be some logic
so that the classifier is implemented in the corresponding compute host.
Any thoughts?
Thanks,
Manuel
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