CORD: Central Office Re-architected as a Datacenter Sachin...
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opencord.org CORD: Central Office Re-architected as a Datacenter Sachin Vasudeva (Adapted from Ali Al-Shabibi) Open Networking Lab
Transcript of CORD: Central Office Re-architected as a Datacenter Sachin...
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CORD: Central Office Re-architected as a Datacenter
Sachin Vasudeva(Adapted from Ali Al-Shabibi)
Open Networking Lab
Service Provider Driven
Residential / Mobile / EnterpriseResidential / Mobile / Enterprise
Collaborators and Contributors
Economies of a datacenter
Infrastructure built with a few commodity building blocks
using open source software and white-box switches
Agility of a cloud provider
Software platforms that enable rapid creation of new services
CORD Aims to Deliver
• Introduction to CORD
• Service Composition in CORD
• ONOS-based Services in CORD
Outline
Design Philosophy
SDN NFV
Cloud
XaaS
XaaS – Everything-as-a-Service
Design Philosophy Tangible Value
SDN NFV
CloudExtends the agility of micro-services to the access network
Supports legacy VNFs and
pushes the limits of disaggregation
Interconnects VNFs and is
a source of innovative services
XaaS
Cloud Economies and Agility
Large number of COs
Evolved over 40-50 years
Huge source of CAPEX/OPEX
Problem: Today’s Telco Central Offices (COs) are huge source of CAPEX/OPEX
• Fragmented non-commodity hardware.• Physical install per appliance per site• Nearly 300+ unique deployed appliances.
BNG
FirewallDPI
CDNMessageRouter
CarrierGrade NAT
Session BorderController
PE RouterSGSN/GGSN/PDN-GW
Source: AT&T
and their design/infrastructure is not geared for programmability, agility
GP
ON
(Access)
RO
AD
M
(Core
)
Commodity Servers, Storage, Switches, and I/O
PON
OLT
Leaf-Spine
Fabric
PON
OLT
e.g., AT&T Open GPON
48-port, 1RU, I/O Box
CORD – Hardware Architecture
CORD POD
Spine-2Spine-1
Leaf-3
Leaf-1
Compute-1
Compute-3
OLT-1
Leaf-4
Leaf-2
Compute-2
Head-Node-1
Head-Node-2
Head-Node-3
OLT-2
1Gbps
Management Network
40Gbps
3x40Gbps
Sizing is Configurable From a partial rack to 16 racks!
CORD Rack
Head NodesOLTs
Compute Nodes
Fabric Switches
ONTs
CORD – Software Architecture
CORD POD
Controller
Operator Directives: Design Time & Runtime
Customer
AccountsInventory Analytics
Allocation
Policy…
CORD – Service Graph
Controller
Operator Directives: Design Time & Runtime
Customer
AccountsInventory Analytics
Allocation
Policy…
vOLT
Controller
vSG
Controller
vRouter
Residential
Subscribers
Controller
Controller
vCDN
Controller
OpenStack ONOS
Controller Controller
Monitoring
XOS
ONOS
Access-as-a-Service
Subscriber-as-a-Service
Internet-as-a-Service
CDN
OpenStack / Docker
vSG vCDN
CORD – Software Stack
vOLT vRouterMulticast
Control
Fabric
ControlVTN
Ceilometer
Monitoring-as-a-Service
Scalable Services Run in
OpenStack VMs and Docker Containers
Control Applications
Hosted by ONOS
Multi-Tenant
Services
Assembled
by XOS
Legacy Central Office
Residence Central Office
CPE ONU OLTETH AGG BNG
BackboneNetwork
CPE – Customer Premises Equipment
OLT – Optical Line Termination
BNG – Broadband Network Gateway
Disaggregation
Residence Central Office
CPE ONU OLTETH AGG BNG
BackboneNetwork
CPE – Customer Premises Equipment
OLT – Optical Line Termination
BNG – Broadband Network Gateway
vSG
vOLT
vRouter
Disaggregation
Residence Central Office
CPE ONU OLTBackboneNetwork
CPE – Customer Premises Equipment
OLT – Optical Line Termination
BNG – Broadband Network Gateway
vSG
vOLT
vRouter
Switching Fabric
BNGETH AGG
Today: Linux Container
Plan: E2-based NF Chain
RO
AD
M(C
ore)
PONOLTs
BBUs
MobilevBBU. vMME,vSGW, vPGW,
vCDN
ResidentialvOLT, vSG,
vRouter, vCDN
EnterprisevCarrierEthernet,vOAM, vWanEx,
vIDS
Metro Ethernet
Domains: Residential/Mobile/Enterprise
CORD Controller
Reference Implementation
CORD POD
An open virtualized service
delivery platform that provides
cloud economies and agility.
From Access-as-a-Service
to Software-as-a-Service.
Hardware Blueprint
Bill of Materials– OCP Servers
– OCP Switches
– OCP Access Blades
Assembly Instructions– …
Testing Infrastructure– …
Open Source Software
Core Components– OpenStack
– Docker
– ONOS
– XOS
Access Services– R: vOLT, vSG, vRouter
– E: vOAM, vCE,…
– M: vBBU, vPGW,…
– …
Other Services– Monitoring
– …
Configured for Different Domains:
Residential, Enterprise, Mobile
Ciena and Radisys
to provide turnkey
CORD PODS
GPON
ONT
AT&T U-verse
AT&T Trial
Spine-2Spine-1
Leaf-1b
Leaf-1a
Compute-1
Compute-3
OLT-1
Leaf-2b
Leaf-2a
Compute-2
Head-Node-1
Head-Node-2
Head-Node-3
OLT-2
Laptop NetGear
CORD Controller
vOLT
Controller
vSG
Controller
vRouter
Controller
Controller
vCDNONOS
Controller Controller
Monitoring
Customer Care
Portal
Operator
Portal
Controller
OpenStack
Residential
Subscribers
Access the Internet
Stream (Cached) Video
Watch TV
opencord.org
ONOS-based ServicesvOLT & vRouter
Software - vOLT
PMC vOLT
OMCI
• Runs either in a container or VM• Exposes an OpenFlow interface north to
ONOS • Controlled by vOLT suite of applications on
ONOS• Converts OpenFlow messages into OMCI
to provision the ONU• Enables the OLT to pass 802.1X and IGMP
packets to ONOS- to implement client/ONU authentication; and- to implement IGMP snooping
CPE boot and Authentication
IO
IO
Metro CoreLink
IO
AccessLink
SpineSwitches
Leaf Switches
RADIUS
Co
ntr
ol
Data
PONOLT
MACs
Commodity hardware
CORD Software Stack = XOS + ONOS + OpenStack
vOLT ONOS App
ONTSimple CPE
GPON
CPE (re)boots
Dataplane Configuration
Home
NetworkCPE OLT
No VLAN Default VLAN (0) Q-in-Q
• OLT double tags packets from customer
• C-tag identifies the customer
• S-tag identifies the OLT the customer is connect to
• OLT also meters customer connections
• OLT maintains group information to handle multicast
traffic
?
Spinning Up a vSG
IO
IO
Metro CoreLink
IO
AccessLink
SpineSwitches
Leaf Switches
Co
ntr
ol
Data
PONOLT
MACs
Commodity hardware
CORD Software Stack = XOS + ONOS + OpenStack
vOLT
ONTSimple CPE
GPONvSG
Authentication has been
successful. A vSG is now
needed.
• vRouter interfaces between a CORD POD and the upstream network
• Communicates with upstream routers and provisions connectivity between CORD and upstream network
• Requirements vary for different deployments
• Implemented as an ONOS network control function
vRouter Service in CORD
You might have thought about VNF like this…
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vRouter
Data Plane
Control Plane(OSPF, BGP ..)
VNF = vRouter VM
VNFM(VNF Manager)
Management(CLI, SNMP, NETCONF)
Data Plane
Control Plane(OSPF, BGP ..)
Management(CLI, SNMP, NETCONF)
Problem
Hair pinning
Embedded control plane complexity for scale-out
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vRouter
vRouterVM
CPDP
VNF
VNF
VNF
DP
DP
DP
DP
CP
DP
This is how we implement vRouter…
Me
troR
ou
ter
ONOS Controller Cluster
vRouterControl
vOLTControl
OverlayControl
Underlay Control
MulticastControl
XOS (Orchestrator)
vSG
vSG
vSG
VNF
VNF
VNFVNF
VNF VNFVNF
VNF VNF VNFVNF
VNF
OVS OVS OVS OVS OVS
White Box White Box
White Box
White Box
White Box White Box White Box White Box
White Box White Box White Box
White Box
White Box
White Box
White Box
White Box
vRouter
Quagga
BGP/OSPF
CORD vRouter Implemented as a big distributed router
Presents entire CORD infrastructure as a single router to outside world30
R,E,M-Access
CORD Provides Cloud Economies and Agility
Fully Exploits Micro-Services (Access-as-a-Service)
Fully Exploits Disaggregation (vOLT vSG vRouter)
Fully Exploits SDN (overlay, underlay, services)
CORD is Catalyzing an Ecosystem
Active Developer Community (Carriers and Vendors)
Two Partners Providing Integration (Ciena, Radisys)
Summary
