carrier ethernet protection options - · pdf file© ciena confidential and proprietary...

© Ciena Confidential and Proprietary

Carrier Ethernet Protection Options

John Hawkins Carrier Ethernet Service Delivery October 2011

2 © Ciena Confidential and Proprietary

Predictable Resilience Options

G.8032 OpEx friendly (E-Line, E-LAN, and E-Tree services) Low CapEx Sub 50ms protection Standardized in ITU-T SG15/Q9 G.8032

PBB-TE

IEEE standard 802.1Qay Sub 50ms protection Traffic engineering, Static Provisioning

MPLS Protection via FRR or BFD mechanisms Dynamic control plane

MPLS-TP

Sub 50ms protection Static provisioning model (or dynamic control plane)

Mesh

Ethernet OAM and Protection Carrier Class QoS

Ethernet Service

Ring

Primary Path

Failover Path


G.8032 Ethernet Rings Major Rings, Sub-Rings & Operator Commands

Ethernet Ring Values • Efficient connectivity (P2P, multipoint, multicast) • Rapid service restoration (<50 msecs) • Technology agnostic (runs over Ethernet, OTN, Sonet etc…) • Fully standardized (in ITU-T SG15/Q9 G.8032) → Feb’08 • Scales to a large number of nodes and high bandwidth links

(GE, 10G, 40G, 100G)

Plus • Services crossing multiple metro rings • Efficient hierarchical aggregation • Multiple metro ring topologies • Single and dual homing configurations • CESD & transport portfolio interoperability • Transport-like operator commands

• Force switch and clear

Standalone rings Single and dual homed ring Ring ladders Sub-ring homing on multiple parent rings

Ring RingID 1

Major Ring RingID 2

Sub-Ring RingID 3

Sub-Ring RingID 5

Sub-Ring RingID 4


R-APS messages

a) Normal configuration b) Ring span failure occurs

c) LOS detected d) Port blocking applied e) APS message issued

f) R-APS causes forwarding database flush g) Ring block removed

A B

C

D E

F

A B

C

D E

F

A B

C

D E

F

A B

C

D E

F

R-APS messages

A

G.8032 Failure/Restoration Walk-thru

2 1

3 4


G.8032 Sub-rings: How it Works A sub-ring is a G.8032 ring that:

• On its own, does NOT form a closed loop.

• Is connected to other G.8032 ring via a pair of interconnection nodes

Traffic between the interconnection nodes is controlled by the major G.8032 ring(s) via an interconnection link.

Sub-Ring’s RPL channel block only block client traffic, not R-APS messages

Sub-Ring’s implicitly block R-APS messages at their interconnection node termination ports.

Data traffic is prevented from ingressing/egressing the port Control traffic (R-APS messages) not forwarded across the node

- R-APS messages are still handed to SW for processing locally

- Local SW generated R-APS messages are still allowed out the port

- A failure of the Interconnection link causes protection switching of the major ring ONLY.

Sub-Ring termination points

A B

C

D E

F J F

E

G H

I

MajorRing

Sub-Ring

Interconnection Link

Major Ring

Sub-Ring


G.8032 Major Ring

G.8032 Dual-homed

Sub-Ring

G.8032 Ethernet Ring Protection with Sub-Rings

Mesh VCs

LER

LER

MTU

PE/LER

MPLS-TP LSR

Operator “Force Switch” Command Operator “Clear ” Command

Services across multiple ring topologies

Sub- ring Protection Switching

Transport Like – “Operator Commands”


Example G.8032 Network Applications Wireless Backhaul

Business Services - Access

Business Services – Private Build

Business Services – DSL Aggregation

CO

Metro Packet Transport

N x T1/E1s

Ethernet

Data

Voice

BSC

RNC

Metro/Collector G.8032

Metro/Collector G.8032

Access G.8032


Other Core Technology Data

Voice

BSC

RNC

Access G.8032

HQ Metro Packet

Transport

Metro/ Collector G.8032

Metro/ Collector G.8032

Access G.8032


Other Core Technology

Data

PSTN

HQ

Data

PSTN

PBX Ethernet

T1/E1s

Branch Office #1

PBX

Ethernet

T1/E1s

Branch Office #2

PBX

Ethernet

T1/E1s

Branch Office #3

PBX

Ethernet

T1/E1s

PBX

T1/E1s

Ethernet

Branch Office #1

PBX

Ethernet

T1/E1s

Branch Office #2

Branch Office #3

HQ

Standalone G.8032

Data

PSTN

Ethernet

Standalone G.8032

LAG

Metro Core

Ethernet

Ethernet Ethernet


G.8032 G.8032

Dual-homed

MPLS-TP LSP Protection

PC4 VS MPLS Virtual Switch MPLS to PBB-TE Ethernet to MPLS Ethernet to PBB-TE

Legend

C

PBB-TE

Spoke VC

Spoke VC

VS

VS

VS

PE

LER

LER

PE

MTU

MTU

Deterministic traffic engineering & resilience

End to end protection, facility backup (1:1 and 1:n protection)

OAM toolset for service assurance S V

S V

S V

LSR MPLS-TP VS

EVCPBB-TE Tunnel / Q-in-QMPLS LSPMPLS LSPQ-in-Q & G.8032EVC


Case Study: Mobile Network Operator

N x 10 GE

Core Routed

Network

Metro/Aggregation Access

BS

GE

BS GE

SR

Agg POP

BS

BS

BS BS

BGP VRRP N x10 GE

SR

MSC

Primary Path Backup Path

Real differentiation: Over 16K Carrier Ethernet enabled cell towers (to date) Microwave/mmwave access (95%) with fibre aggregation Carrier grade networking and OAM Automated provisioning


MNO Case Study What was required/deployed?

“This is how networks will be

built” - CTO

Carrier Ethernet Backhaul from cell site to mobile switching center IP/MPLS (with dynamic control plane) deemed too expensive

Radio+Fiber Transport – lowest cost nationwide solution Transports both 3G & 4G Traffic (30-100 Mbps per cell tower today) Robust resiliency and architectural stability

High service availability via tiered resiliency and diverse path tunnels

Fast deployment and time to revenue simple, fast tunnel & service provisioning (avg. turn up time per tower = 5 min)

Network optimization with low latency handovers & restoration Enhanced scalability (1000+ sites per Metro / millions of services) QoS and SLA guarantees (via CIR/EIR per service and per tunnel) Advanced OAM service monitoring

via 802.1ag, Y.1731, per service loop-backs, etc

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