1. Dynamic Adaptation of VNF Forwarding Graph
proposed NFVRG, July 2014
S. Lee, M.-K. Shin (ETRI)
{seungiklee,
E. Paik (KT)

2. Background VNF forwarding graph (or SFC):
a logical connectivity b/w virtual appliance (VNFs)
Network forwarding path (or SFP):
an instance of VNFFG

3. Update of VNFFG Change of VNF in VNFFG; change of VNF instance in NFP
in MANO
update of network service descriptor
in Use cases
VNF instance relocation for service continuity, service availability in mobile core network
provisioning, restoration, localization of failure, resizing of VNFFG
modification of resource assignment at load changes and failure
 motivates automated and dynamic update of VNFFG considering NFV resources

4. Dynamic Adaptation of VNFFG
“Creation and dynamic update of VNFFG and NFP adaptively to status of resources/traffic” (not scale-up/down)

5. Dynamic Adaptation of VNFFG
Examples
Traffic optimization: construct NFPs with low stress and stretch considering the different locations of multiple SF instances.
Fail-over: select live VNF instances and replaces VNF instances in failure by checking their availability
Load balancing: select VNF instances to distribute load for the traffic considering the current status of VNF instances or nodes where the instances are embedded
Security threat: add or remove VNFs at a doubtful state of resource and traffic

6. Dynamic Adaptation of VNFFG
Target actions
selection/replacement of {VNF, VNF instances}
Target resources
VNF, VNF instances, nodes, links, traffic
Metrics (what to consider)
Availability, load, performance of VNF instances, nodes, links (among VNF instances)
Topological location of source, destination, VNF instances, nodes
Volume of traffic flow
...

7. Further Steps More use cases & metrics
Algorithms & approaches to adaptation
Required common functionalities
e.g., metric calculation, monitoring, status query/report, topology extraction, ...
Other issues
redundant NFPs with state synchronization for resiliency
programmability of VNFFG/NFP adaptation
As a control-plane mechanism in SFC WG