Trellis An Open-Source, White-Box, SDN Based Leaf-Spine Fabric. Charles Chan, Ph.D.
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1 Trellis An Open-Source, White-Box, SDN Based Leaf-Spine Fabric Charles Chan, Ph.D.
2 Outline What is Trellis? Trellis features Why Trellis? Recent activities (in 2018) Deployments & use cases Ecosystem & roadmap
3 What is Trellis? Production-ready multi-purpose leaf-spine fabric designed for NFV White Box Hardware Open Source Software SDN Based
4 Trellis Full Topology Spine Quagga Spine Leaf Paired Leaves Access Device Upstream Router Dual homed hosts Field Office (2nd stage) Single homed hosts Central Office (1st stage) DHCP Server Metro Network
5 Way Too Complicated? Trellis supports simpler configurations too!
6 Single Leaf
7 Single Leaf Pair
8 Single Leaf Pair with Upstream
9 Single Stage
10 Single Stage with Leaf Pairs & Upstream
11 Trellis in Production
12 Trellis Features Bridging with Access & Trunk VLANs (within a rack) Routing (inter-rack) IPv4 & IPv6 Unicast routing with MPLS Segment-Routing IPv4 & IPv6 Multicast routing Dual-homing for compute-nodes and external routers Multi-stage fabrics (2 layers of spines) vrouter - entire fabric behaves as a single router BGP (v4/v6) support for external connectivity Static routes, route blackholing DHCP L3 relay (v4/v6) MPLS Pseudowire Q-in-Q termination T3 (Trellis Troubleshooting Tool), onos-diags
13 Trellis Features / Bridging & Routing Pop MPLS Label Routing Push MPLS Label Bridging
14 Trellis Features / Multicast (1/3) Single-homed source, single-homed sink
15 Trellis Features / Multicast (2/3) Single-homed source, dual-homed sink
16 Trellis Features / Multicast (3/3) Dual-homed source, dual-homed sink
17 Trellis Features / Dual-Homing
18 Trellis Features / Dual-Homing / Failure (1/2) Pair link is only used to recover local failure
19 Trellis Features / Dual-Homing / Failure (2/2)
20 Trellis Features / Multi-Stage Pop MPLS Label Retain MPLS Label Push MPLS Label
21 Trellis Features / vrouter OF/P4RT FPM Data plane traffic BGP v4/v6 session
22 vrouter Control / data separation Entire fabric as a big router Also supports static routes and route blackholing
23 Trellis Features / DHCP L3 Relay
24 Trellis Features / Pseudowire
25 Trellis Features / Q-in-Q Termination Untagged packet Push/pop double-tag Double-tagged packet Works with single switch too
26 Various ASIC/Vendor Support Broadcom Qumran, Tomahawk, Trident2 switches from EdgeCore, QCT, Delta, Inventec (WIP) Preliminary support P4-based Tofino switches from EdgeCore, Delta, Inventec Preliminary support for Mellanox Spectrum switches Preliminary support for Cavium Xpliant switches
27 Deployments & Use Cases Trellis in Comcast - Utilizes almost all Trellis features - Trellis is installed and monitored by Kubernetes - Integrates with in-house VNFs, logging, telemetry and alarm systems Trellis in CORD / SEBA - Utilizes bridging, routing, multicast, cross connect, dual homing - L2 load balance (WIP)
28 Trellis is designed for Service Providers & NFV Why Trellis? SDN allows simpler/easier/optimized features SDN + Programmable pipelines -> New features Open-source -> SP ownership & customizability
29 Recent Activities (in 2018)
30 Production Readiness December November 2018 Support Comcast Support Other teams Deliver New Features ONOS Stability & Scale Tooling QA & Bug Fixes Support Comcast design/dev/qa/ops teams - issue analysis; root-cause; Recommend bestpractices/ training Design discussions for new features & architectural improvements Daily scrum (-May 18) Documentation Broadcom Nokia Harmonic Pseudo wires for inband control Routing in H-Agg based topologies Multicast improvements Dual-homing improvements DHCP v4/v6 Relay IPv6 Router Adv. ISSU architectural discussions/progress Other small features Focus on stability of ONOS distributed stores (9 releases of Atomix in 4 months) Scale investigation ongoing T3 - Trellis Troubleshooting Tool onos-diags - Diagnostics collection tool Mininet scripts - Software-emulated test environment Developing automated feature tests (220 new tests in the 4 months) Extending framework for hardware based tests 180 tickets resolved
31 Stratum/P4 Integration Controller OpenFlow (OF-DPA) Trellis ONOS ONOS NB API P4Runtime gnmi, gnoi Local Ctrl Network Config Pipeline Config OFagent Stratum Stratum Switch ASIC ASIC VNF ASIC VNF Thin Switch Hybrid Server VNFs
32 Ecosystem & Roadmap
33 Distributed DevOps Model Analyze issues reported by Harmonic in their setups Code review patches they submit to ONOS Design discussions for new features Bringing up ONF pod housed in San Jose Bringing up ONF pod hosted by Flex QA collaboration Report issues found; ~75 cases Create automated tests to reproduce Validate fixes / releases Help with issues in their setup Design discussions for new features Daily scrum Deliver features; meet ops needs Deliver stability, scale, perf, tools Support Comcast design/dev/qa teams issue analysis; root-cause; recommend best-practices/ training Design discussions for new features Daily scrum Documentation Report issues found in hw Validate T2 versions of switch software EdgeCore builds for us Design discussions for apps/features created by Nokia Code review submitted patches (40 changesets; 4-5 patchsets/change) Validate some features; report issues
34 and more
35 Roadmap Scale & Performance improvements Dual homing for Access nodes (like OLTs) In Service Software Upgrades (ISSU) Stratum/P4 integration BNG features (e.g. PPPoE termination, hierachical QoS) 5G user plane features
36 Next-Gen SDN Demo Trellis (Segment routing, multicast, vrouter, etc) In-band Network Telemetry (INT) VNF Offloading Control (S/PGW) ONOS Mixed P4/OpenFlow multi-vendor whitebox switches Broadcom, Barefoot, Edge- Core, Inventec, Delta INT Stratum OF-DPA Field office INT Stratum INT+S/PGW Stratum P4Runtime INT Stratum OpenFlow OF-DPA netcfg - Devices - Ports - DHCP relay Upstream BGP routers P4 program fabric.p4 - L2/L3/MPLS - INT - GTP termination End hosts GTP traffic Internet Telemetry collector Barefoot DeepInsight Base station (emulated) INT reports OF-DPA INT Stratum OF-DPA Central office OF-DPA INT collector Multicast video source INT P4 SmartNIC Netcope
37 Thank You Charles Chan
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