1 / 11

SFC Service Function Path Optimization (Offloads) draft-kumar-sfc-sfp-optimization-01

SFC Service Function Path Optimization (Offloads) draft-kumar-sfc-sfp-optimization-01. Surendra Kumar Jim Guichard Paul Quinn Cisco Systems, Inc. Joel Halpern Ericsson. Core Argument Optimize the Service Function Path. Traffic need not traverse all the SFs, all the time

nevada-mcfarland
Download Presentation

SFC Service Function Path Optimization (Offloads) draft-kumar-sfc-sfp-optimization-01

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. SFC Service Function Path Optimization (Offloads)draft-kumar-sfc-sfp-optimization-01 Surendra Kumar Jim Guichard Paul Quinn Cisco Systems, Inc. Joel Halpern Ericsson IETF 91, Honolulu | SFC WG

  2. Core ArgumentOptimize the Service Function Path • Traffic need not traverse all the SFs, all the time • Higher latencies: network, SF processing, etc. • Wasted resources: network, memory, cpu, etc. • Alter the SFP, in the data-plane and within policy • SFs control this, while being agnostic to SFP • SFP shortens while SFC remains un-altered! • Use SFC Encapsulation to optimize the SFP IETF 91, Honolulu | SFC WG

  3. SFP Optimization MethodSimple Offloads in two stages • Simple Offloads • ‘Offload’ directive (Yes or No) + ‘Action’ (Permit or Deny) • Stage1: SF Offloads • SFs request SFFs to not steer further packets on a flow • Stage2: SFF Offload propagation • SFFs propagate offload directives upstream to other SFFs IETF 91, Honolulu | SFC WG

  4. SFC ArchitectureExample diagram with workloads and SFs • Service Function Types: • SFa • SFb • SFc SFC Control Plane Service Overlay IETF 91, Honolulu | SFC WG Transport Underlay SFF4 SFF3 SFF5 SFF1 SFF2 NF NF NF NF NF WL1 WL2 WL3 WL4 WL5 WL6 SFa1 SFa 2 SFa 3 SFb 1 SFb 2 SFb 3 SFc 1 SFc 2 SFc 3 Work Loads Service Functions Work Loads

  5. SFC Architecture …2Example diagram with workloads, SFs, SFC and SFP SFC :: {SFa, SFb, SFc} SFP :: {SFa1, SFb1, SFc1} SFC Control Plane Service Overlay IETF 91, Honolulu | SFC WG Transport Underlay SFF5 SFF4 SFF1 SFF2 SFF3 NF NF NF NF NF WL1 WL2 WL3 WL4 WL5 WL6 SFa1 SFa 2 SFa 3 SFb 1 SFb 2 SFb 3 SFc 1 SFc 2 SFc 3 Work Loads Service Functions Work Loads

  6. Simple Offloads, Stage1SFs offload service delivery to SFFs, at flow granularity SFC :: {SFa, SFb, SFc} • SFP :: {SFa1, SFb1, SFc1} • SFb1 is offloaded to SFF3 Cache Offload decision SFC Control Plane offload Service Overlay IETF 91, Honolulu | SFC WG Transport Underlay SFF2 SFF1 SFF3 SFF4 SFF5 NF NF NF NF NF WL1 WL2 WL3 WL4 WL5 WL6 SFa1 SFa 2 SFa 3 SFb 1 SFb 2 SFb 3 SFc 1 SFc 2 SFc 3 Work Loads Service Functions Work Loads

  7. Simple Offloads, Stage1 …2SFs offload service delivery to SFFs, at flow granularity SFC :: {SFa, SFb, SFc} • SFP :: {SFa1, SFb1, SFc1} • SFb1 is offloaded to SFF3 • SFa1 is offloaded to SFF2 • SFc1 is offloaded to SFF4 Cache Offload decision SFC Control Plane Offload Offload Service Overlay IETF 91, Honolulu | SFC WG Transport Underlay SFF5 SFF2 SFF4 SFF1 SFF3 NF NF NF NF NF WL1 WL2 WL3 WL4 WL5 WL6 SFa1 SFa 2 SFa 3 SFb 1 SFb 2 SFb 3 SFc 1 SFc 2 SFc 3 Work Loads Service Functions Work Loads

  8. Simple Offloads, Stage2Optimum SFP Offload SFC :: {SFa, SFb, SFc} • SFP :: {SFa1, SFb1, SFc1} • Offloads propagated towards the classifier • SFF1 directly forwards on the underlay SFC Control Plane Service Overlay IETF 91, Honolulu | SFC WG Transport Underlay SFF1 SFF3 SFF4 SFF2 SFF5 NF NF NF NF NF WL1 WL2 WL3 WL4 WL5 WL6 SFa1 SFa 2 SFa 3 SFb 1 SFb 2 SFb 3 SFc 1 SFc 2 SFc 3 Work Loads Service Functions Work Loads

  9. Simple Offloads, Key BenefitDistributed SF delivery Service overlay and SF sharing across SFFs & SFCs, leads to distributed SF delivery effect Service Overlay SFF1 SFF2 SFF3 SFF4 SFF5 Transport Underlay SFa1 SFa 2 SFa 3 SFb 1 SFb 2 SFb 3 SFc 1 SFc 2 SFc 3 Service Functions IETF 91, Honolulu | SFC WG

  10. Why not classify and bypass SFs, instead ?Achieve similar effect through SFC Classifiers or Control Plane • Classify & select appropriate chain @ SFF • Static classification • SF classification vs. SFF classification • Classification overhead • Use Control Plane • Too slow • Buffer or Drop traffic ? • May be appropriate in some cases SFC Control Plane Service Overlay IETF 91, Honolulu | SFC WG Transport Underlay SFF SFF SFF SFF SFF NF NF NF NF NF WL1 WL2 WL3 WL4 WL5 WL6 SFa1 SFa 2 SFa 3 SFb 1 SFb 2 SFb 3 SFc 1 SFc 2 SFc 3 Work Loads Service Functions Work Loads

  11. What next ? • Allocate necessary bits in SFC encapsulation • Just two for simple offloads • 1-bit: Offload, 1-bit: Action • Enables SFF & SF simple-offloads interoperability • Reference this in the SFC architecture draft • Adopt as a WG draft • Please provide feedback/comments IETF 91, Honolulu | SFC WG

More Related