Use Cases for SF Aware Topology Models draft-bryskin-teas-use-cases-sf-aware-topo-model-01 Igor Bryskin (Huawei Technologies) Xufeng Liu (Jabil) James Guichard (Huawei Technologies) Young Lee (Huawei Technologies) Luis Miguel Contreras (Telefonika) Danielle Ceccarelli (Eriksson)

Changes since IETF99 Luis and Danielle are joined as co-authors Terminology section is added - Network Function - Service Function - Service Function Chain Figures illustrating use cases are added On– and off-line discussions Editorial changes

SF Aware Network Topology L2x SF1 L23 L32 N3 L3x L21 N2 SF3 L24 L12 L34 L36 L42 L43 L1x N1 L14 L41 N4 SF5 L45 SF6 L15 L54 L63 L51 L56 L65 L5x N5 L156 L165 N6 L6x SF1 Example: SF-aware TE topology 3

SFC with TE constraints L2x SF1 L23 L32 N3 L3x L21 N2 SF3 L24 L12 L34 L36 L42 L43 L1x N1 L14 L41 N4 SF5 L45 SF6 L15 L54 L63 L51 L56 L65 L5x N5 L156 N6 L6x L165 SF1

SFC Recovery (1) SF2 on node N1 fails SF4 SF2 SF6 SF2 L2x SF1 L23 L32 5 SF2 on node N1 fails

SFC Recovery (2) SF4 SF2 SF6 SF2 L2x SF1 L23 L32 N3 L3x L21 N2 SF3 L24 L12 L34 L36 L42 L43 L1x N1 L14 L41 N4 SF5 L45 SF6 L15 L54 L63 L51 L56 L65 L5x N5 L156 L165 N6 L6x SF1 SFC SF1-SF2-SF6 is recovered after SF2 on node N1 failed 6 6

SFC Recovery (3) SFC SF1-SF2-SF6 is recovered after node N1 failed SF4 L2x SF1 L23 L32 N3 L3x L21 N2 SF3 L24 L12 L34 L36 L42 L43 L1x N1 L14 L41 N4 SF5 L45 SF6 L15 L54 L63 L51 L56 L65 L5x N5 L156 L165 N6 L6x SF1 SFC SF1-SF2-SF6 is recovered after node N1 failed 7 7

SFC load balancing Two parallel SF1-SF6 SFCs with TE constraints SF4 L2x SF1 L21 L23 L32 N3 L3x N2 SF3 L24 L12 L34 L36 L42 L43 L1x N1 L14 L41 N4 SF5 L45 SF6 L15 L54 L63 L51 L56 L65 L5x N5 L156 L6x L165 N6 SF1 Two parallel SF1-SF6 SFCs with TE constraints 8 8

Optical tunnel as TE-constrained SFC of 3R regenerators Red trail (not regenerated) is not optically reachable, but blue trail (twice regenerated) is 9 9 9

Compute Resource aware Topology VIRTUAL SWITCH VM Compute Node HYPERVISOR N1 N2 N4 N3 N5 N6 L12 L21 L23 L32 L24 L42 L43 L34 L36 L63 L14 L41 L15 L51 L54 L56 L156 L65 L165 L45 L1x L2x L3x L6x L5x VIRTUAL SWITCH VM Compute Node HYPERVISOR Compute Node is attached to network WAN node. It contains VMs which can be modeled as a Service Function (SF). VM resources (instances, usage, CPU/Memory) can be modeled and integrated with network topology model to facilitate VM migration, dynamic load balancing, etc. 10

Next steps Solicit more feedback from WG Identify more use cases Relate to IETF Network Slicing work