Cisco 5G Ready Transport · &lvfr ´ * 5hdg\µ 7udqvsruw:dulv 6djkhhu 6lprq 6sudjjv 'hqqlv +djduw\...
Transcript of Cisco 5G Ready Transport · &lvfr ´ * 5hdg\µ 7udqvsruw:dulv 6djkhhu 6lprq 6sudjjv 'hqqlv +djduw\...
Cisco “5G Ready” Transport
Waris Sagheer, Simon Spraggs, Dennis Hagarty 14-Nov-2018
© 2017 Cisco and/or its affiliates. All rights reserved. Cisco Public
GSX FY19
Timing and synchronization
Welcome & Introduction
Summary
5G challenges for transport
A 5G transport ready infrastructure Agenda
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Business Landscape
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2015 2016 2017 2018 2019 2020
Mobile ARPU, Multiple Countries
Source: EU Commission
Consumer ARPUs are Declining or Flat B2B or B2B2x Market Has Future Growth
Emergence of Low Latency Need for
better QOE and to Enable New Applications
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5G challenges for transport
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Source: Recommendation ITU-R M.2083
5G Key Use Case Categories
• Focused on low power wide area NB-IoT with high connection density and energy efficiency
• For mission critical use cases (self driving, Public safety, ...)• Desired 1ms access time only refers to radio interface and
would be most useful in near field mission critical apps
• Extra capacity delivered through new 5G frequency bands • Not too concerned with connection density or latency.
Enhanced Mobile Broadband (inc. Fixed Access)Increased Bandwidth
and Capacity
IoT/massive Machine Type Communications Slicing, Flexible deployment, NFV/Virtualisation
Push data plane to the edge,Intelligent in Network
Ultra-Reliable Low Latency
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Distributed workloads to the edge of the network driven by low latency applications, lower transport costs, QOE
Any-to-any connectivity between distributed UPFs and with centralized UPF&CP
Ability to run multiple logical networks as virtually independent
Simultaneous support of strict SLA & best effort traffic over same infra
Dynamic and flexible slicing creation/modification
Unified Network Fabric, Network Programmability & Automation, Strict QoS, Convergence
MEC/CUPS Network Slicing CRAN
Introduction of RAN splits and virtualization of RAN workloads
Low latency and high throughput access networks
Distributed workloads to different levels of the transport network
5G Transport - Technology Evolutions
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D-RANBACKHAUL
C-RANBACKHAULFRONTHAUL
C-RANBACKHAULMIDHAUL
C-RANBACKHAULMIDHAULFRONTHAUL
RU/DU/CU
RU
eCPRI v.high b/w, µsec delay
RU/DU
F1: ~user b/w, msecs delay
Nx, ~user b/w, msecs delays
Nx, ~user b/w, msecs delays
RU
eCPRI v.high b/w, µsec delay F1, Nx, b/w=user rates, msecsdelays
Nx: user b/w, msecs delay
DU vCU
vCU
EdgeAggregationPre-AggCell site
DU/vCU
vUPF
vUPF
vUPF
vUPF
5G Transport - RAN impacts Transport Design
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5G ready transport architecture
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Cisco’s overall 5G transport proposition
Ω
Access Core
Switched DWDM
Aggregation
DCPre-
Aggregation
Transport control / orchestration
Telco/ITDC Domain
DC
Dark Fiber / WDM
Mobile Core Control / orchestration
EnterpriseConsumerSMB
CPEs
Mobile Network SliceManager
Big data / automation
Edge
Use Cases
Controllers / Automation / Telemetry /Analytics
Access control / orchestration
BGP-VPN L2/L3 + Overlay VPNs
Multi-serviceFlexible radio / mobile core / service placement
End2end packet infrastructure
Up to x10 radios (500k n/w devices)x4 – x100 bandwidth than 4GMulti-Access Edge Compute
Segment Routing
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Physical Network Evolution
Access CoreAggregationPre-Agg
Peering
200K n/w devices
Access CoreAggregationPre-Agg EdgePeering
GW
Optical Cut-through
Multi-degree ROADM
• MEC demands IP switching capabilities where ever there is DC
• Traffic demands are lambda level and above
• MEC creates discrete optical domains, reduces optical drive distances and simplifies optical infrastructure
• Open ROADM, pluggable DWDM optics driving new round of IP optical integration
1-10Gbps10-100Gbps
>100Gbps
10-100Gbps >100Gbps >400Gbps >400Gbps
Passive or dark fibre
Multi-degree ROADMs
Today
Future
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Access
Aggregation
Logical Network Evolution: Todays Service Creation
HW Appliances
Legacy Central Office
Metro Network Domain Core Network Domain Data Center Domain
Limited Cross-domain Automation
Centralized Delivery of Services
VNF
IPMPLS
L2VPN
Ethernet
L3VPN VXLAN
E2E service provisioning is lengthy and complex:
Multiple network domains under different management teams Manual operations Heterogeneous Underlay and Overlay networks
VNF
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Logical Network Evolution:5G Infrastructure
Metro Network Domain Core Network Domain Metro Network Domain
LDP
RSVP
IGP
BGP-LU
LDP
Intra-Domain CP
FRR or TE
Inter-Domain CP
L2/L3VPN Services
IGP with SR
BGP
IGP with SR
BGP-LU
EPN 4.0 EPN 5.0 Metro Fabric
BGP LDP BGP
EVPN L2 & L3 VPN
Segment Routing
SR PCENSO XWWAE
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Network Resiliency TI-LFA and automated 50ms protection
ScalabilityMultidomain architectureOn-Demand Nexthop (ODN)Stateless within core
Service Aware underlayTraffic SteeringAutomated Traffic Steering
End to End path control Shortest PathFlex-algoMulti—domain TESR-PCE + Distributed CP
Network SimplificationEliminate LDP, RSVP and other protocolsStateless core devices
Simplified Service Creation Concurrent support for network and overlay VPNs
OAM and performance managementUnderlay and service monitoringReal time adjustments based on PM
Standards Based No vendor lock-in
5G Transport: Why Segment Routing
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SR: Engineering the Underlay
• Flex-Algorithm
Builds domain level forwarding tables
IGP distributes multiple metrics / affinities
Multi-algorithms operational in network
SPF, Low Latency, constrained nodes / links (customer chooses)
TiLFA per algorithm
• SR Policies (or SR-TE)
Builds paths between nodes
Path computation based multiple constraints (b/w, latency, affinity)
Calculated by head-ends or an SR-PCE
Multi-domain / disjoint paths require SR-PCE
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Example Green: Low latency, Red: IGP path
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Segment Routing – Service Aware Traffic Steering
10.10.10.0/24 NH=7 color=GREEN20.20.20.0/24 NH=7
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20.20.20.0/24 (standard)
10.10.10.0/24 (low delay)Traffic for
10.10.10.1 – NH 7 and
20.20.20.1 - NH 7
IGP
Delay optimized
10.10.10.0/24
20.20.20.0/24
RR
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IGP
Delay optimized10.10.10.0/24 FC1
20.20.20.0/24 FC0
Ingress classification DSCP = EF FC = 1 GreenDSCP = AFxx FC= 0 IGP
Traffic for 10.10.10.1
10.10.10.0/24EF= Low delay Everything else IGP
Destination based
Flow based
• Traffic Steering
Mechanism on source router to steer traffic
By default traffic uses IGP path
Can steer traffic into a SR policy or specific Flex-algos
Destination TS : destination only
Flow based TS : destination + QoS criteria
• Automated Traffic Steering
Hints on SR policy conveyed in overlay route updates
Significantly reduces configuration
Uses BGP color extended community (RFC 5512)
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SR Path Computation Element (SR-PCE)
Solution
Multi-Domain SRTE VisibilityCentralized SR-PCE for Multi-Domain Topology view
Integration with ApplicationsNorth-bound APIs for topology/deployment
Delivers across the unified SR Fabric the SLA requested by the service
Benefits
SRTE Head-End
Simplicity and AutomationEnd-to-End network topology awarenessSLA-aware path computation across network domainsDisjoint pathsMulti-domain path computation and ODN
Distributed Mode – SR-TE Head-EndVisibility is limited to its own IGP domain
DeployCollect
TopoDB
Compute
REST API
IGPBGP-LS
BGP
PCEP
Single / Multi-Domain Topology
Native SR algorithms
SR-PCE runs on virtual or physical IOS-XR node
APP APP APP
Metro Core Data Center
Aggregation
Access Metro
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Is Diffserv QoS “Good Enough” for 5G • Yes, as a transport QoS strategy!
Slice b/w / class protection through ingress conditioning and marking
Class separation and protection with core scheduling
Bandwidth reuse
QoS aware capacity planning
• FOR LOW LATENCY SERVICES THE OVERALL DESIGN NEEDS CONSIDERATION
Network delay = propagation delay + switching delay + scheduling delay + serialization delay
• Proximity of gateway functions to users
Reduce propagation delay and OEO delays
• Proximity of applications to users
Reduce propagation delay and OEO delays
• Serialization delay is a consideration for fronthaul applications (TSN)
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Service Infrastructure
• Network based VPNs
• 5G based VPNs
• Overlay / SDN-WAN based VPNs
• Enterprise services
• Inter-DC communications
Service config
CE
BGP RR
CE
SD-WAN controller
CECE
SR-PCE
SR-PCESR-PCE
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Transport level 5G slicing
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Edge DC Far Edge DC
MPLS/SR UNDERLAY
Example: 5G backhaul dataplane slice
e/gNB
e/gNB
e/gNB
AF
Peering
Internet VPN
Enterprise VPNs
PE
3GPP control Plane L3 VPN
Access CoreAggregationPre-Agg
EdgeEdge DC
Regional DC
3GPP controlservers
Central DC
Backhaul (N3)E-LAN or L3 VPN
UPF
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• Small number of slice planes defined in underlay (across domains)
5G mobility slices (eMBB, URLLC, mIOT, signalling, etc.)
Major Service Type (Wholesale, MVNO, Enterprise, Content, etc.)
• Diffserv QoS enabled network
• Each Slice plane characterized by
Optimization + constraint objective : latency, bandwidth, reliability,
• Based on a flex-algorithm (SPF included) or pt-2-pt SR policies
Slicing in the Underlay Based on SLA Requirements
Slice 1
Slice 2
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Mapping Customers to Underlay Slice Planes
Slice 1
Slice 2
• L2/L3 VPNs used for customer and service separation
• Potentially large numbers
• Traffic classified and controlled on ingress
• Automated Steering place VPN traffic into correct underlay slice plane
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Timing and Synchronization
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• 5G (like modern LTE-A networks) requires phase synchronization
• New 5G TDD radios definitely require it: 3GPP: 3µs between base stations (for TDD, LTE-A radio co-ordination)
Radio backhaul network: ±1.5µs from reference time
Timing and Synch – New Phase Requirements
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• 5G is also re-engineering the Fronthaul network towards Cloud RAN:• CPRI to packet-based Fronthaul/Midhaul impacts timing
• Much tighter requirements for phase alignment budget
Timing and Synch – Fronthaul
Fronthaul
vBBU
WAN/Backhaul
Mobile Core
RU
RU
RU RU
RU
RU
RU: Remote Unit
Backhaul
WAN/Backhaul
Mobile Core
eNB
eNB
eNB eNB
eNB
eNB
RU: Remote Unit
Backhaul
Distributed RAN
CentralizedRAN
Midhaul
DU
Fronthaul
CU
DU
WAN/Backhaul
Mobile Core
RU
RU
RU RU
RU
RU
RU: Remote Unit
Centralized Unit
Distributed Unit
CloudRAN
CPRI
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• Great solution: G.8275.1 with “on path support” for PTP• Needs good network design in combination with SyncE• End-to-end timing “budget” with accurate boundary clocks
• PTP/SyncE as a backup to GNSS receiver outages• GNSS where it’s cost effective, PTP everywhere else
• Effective solution where site conditions allow (Sky view, $$)• Susceptible to jamming (and increasingly spoofing)• Time source for cell sites, PTP GM’s and monitoring equipment
GNSS (GPS, Galileo) Receivers Include GNSS receivers inside routers where appropriate
PTP/1588 and SyncE in Transport NetworkRouters as high performance
T-BC boundary clocks with Class B/C G.8273.2 performance
Flexibility in the design of the equipment allows them to be
used in any situationAll of the Above
Timing and Synch – Solutions
Galileo photo © GSA
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• There are various profiles available for use
• Most operators looking at G.8275.1 – the best timing solution
• Supported across ASR900, ASR920, NCS500, NCS5500, ASR9K range
Timing and Synch – PTP Profiles for Phase
T-BC-P
PTP unaware
“G.8265.1 like”
Ethernet Multicast
IPv4 UnicastIPv6 optional
T-TSC-P
T-TSC
PTP awarebackhaul network
T-GMT-BC
PTP with full on-path timing support, G.8275.1 Telecom Profile
T-BC T-BC T-BC
PTP unaware
“G.8265.1 like”
T-GM
PTP with partial timing support, G.8275.2 Telecom Profile
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Summary
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• 5G brings new requirements and challenges to transport network
• Cost and simplicity is critical
• Outlined Cisco approach to 5G transport networking
• Streamlining network structure and packet optical integration
• Segment Routing for engineering and simplifying the underlay
• Concurrent support for BGP based VPNs and SD-WAN solutions
• Timing and synchronization is a vital component of the radio network
• Operators are investing in 5G-ready networks now!!
Summary
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The End
Need more information??
Cisco’s SP Mobility Page: https://www.cisco.com/c/en/us/solutions/service-provider/mobile-internet/index.html
5G xHaul White Paper:https://www.cisco.com/c/m/en_us/network-intelligence/service-provider/digital-transformation/converged-5g-xhaul-transport.html
Compass "Metro Fabric Design” https://xrdocs.io/design/EPN5.0 & EPN4.0: https://www.cisco.com/c/en/us/solutions/enterprise/design-zone-service-provider/programmable-network.html