Taking MPLS to the Edge

Irit Gillath

Agenda

Market status

MPLS, VPLS, HVPLS and other nasty words

Case study: Silver server

Recap

10/6/2011 3

Moving Ethernet from the enterprise to the carrier

Ethernet was used originally for enterprise network

Console based operation

Few expensive experts that ran a medium size network

Simple connectivity schemes

No congestion

Multiply the enterprise environment by 100 or 1000 and you get a small carrier

Do you need to multiply the amount of experts?

Less people = less devices to operate = so I only operate the core and keep all the rest as dumb pipe?

How do I enable new service – one by one hop configuration?

3

What about over subscription? Congestions?

Need for New Transport Technologies

To accommodate huge bandwidth demands, service providers are facing new challenges

Network scale – more and more devices and users are connected to the network (mobile, business, residential)

Different type of services – more than just connectivity. QoS needs to be committed on, measured and delivered, varying between the different applications and users

Flexibility – cope with the increasing rate of new services and applications. Reduce the time to market

Network Convergence – to cut down OPEX costs providers are trying to converge and unified networks while maintaining the service as is

Service creation challenges - Multiple technologies, Multiple protection schemes, Different network functionalities (Core / Aggregation / Access)

Current Typical Network

Core has been covered – advanced solutions using IP/MPLS

Demarcation in evolution

Switches, media conversion, true demarcation

No real solution for edge (access and aggregation)

Access and aggregation are made out of redesigned enterprise equipment

Typical Architecture

Intelligence in Core - Every packet goes up to the core and back down again

www.telco.com 5

What is MPLS, VPLS?

MPLS stands for "Multi-Protocol Label Switching" packet-switching VPN technology

MPLS is a technological infrastructure

Virtual private LAN service (VPLS) is a way to provide Ethernet based multipoint to multipoint communication over IP/MPLS networks

It allows geographically dispersed sites to share an Ethernet broadcast domain by connecting sites through pseudo-wires

Basically it’s like a very big virtual switch

VPLS, H-VPLS, MPLS-TP, MPLS L3VPN are different transports built on top of MPLS

PE A PE C

PE B

PE D

IP / MPLS Network

LSP

Full-

Mesh

VPLS

Service1

VPLS

Service2

Why do we need to add hierarchical?

H-VPLS Spoke options

VLAN, Stacked VLAN, MPLS LSP

Eliminates need for full mesh to include MTUs

Reduces signaling overhead (fewer VC-LSPs)

Simplifies discovery (MTU only aware of upstream PE)

Scalable inter-metro VPLS

•6-Oct-11 MTU

H-VPLS Transformation

•6-Oct-11

MTU

Spoke VCs

Hub VCs

MTU

PE

PE

PE

PE

MTU

MTU

MTU

MTU

CE Routers

VLANs, Stacked

VLANs or VC

Labels

MTU

PE

PE

MTU

MTU

MTU

MTU

MTU

PE

PE

MTU

MTU

Becomes this

This

Advantages of extending MPLS/VPLS to the Edge

Increase network scalability

Reuse 1M labels across the network

Encapsulate QinQ / .1Q services

Per customer per service QoS enforcement (HQoS)

Per customer per service monitoring

Implement a Multi-Service Network

Consolidate WBH, VPN’s, VoIP & video services to run on the same infrastructure

Lower OPEX and CAPEX

Devices are designed and built for the solution

Extended the L2VPN up to the core – less resources

Optimized Power consumption to the Byte

Optimize and make full use of network resources

www.telco.com 9

Real life experience – Silver Server

Silver Server Austrian privately owned service provider

Founded 1994

Most infrastructure was built in 2000

150 miles (200 km) fiber infrastructure in Vienna

POPs in all major cities in Austria

Residential

Businesses

2 COs in Vienna

75 employees

Initial network Access aggregation / backhaul

Connecting POPs to core of network

Internet IP routers for DSLAMs located at DSL PoPs

Simple ring topology

Minimal Layer 2 carrier business services

Based on VLANs

MAC learning required on the entire access network domains

Challenges

MAC address tables

Available bandwidth

Network diameter and complexity

Separate Layer 2 domains & technologies

Fault restoration and detection

QoS requirements

Network management

More Re-design Considerations PROBLEM:

Capacity in access network expensive

Policing of IP downstream traffic happens after passing the access network

Many small (low-end) IP routers

SOLUTION:

Locate fewer but larger high-end IP access routers closer to IP-core to apply traffic policies

Use MPLS Pseudowires for backhaul between Access-POP and core aggregators

By use of MPLS instead of VLAN the MAC learning within the access is still limited to its domain

MPLS remove scaling problems

Re-designed network

I n t e rn e t I P

MPL S C O R E N e t w o rk C i sco 6 5 0 0

D SL C u st o me rs

AN -A

D SL C u st o me rs

AN -B

D SL C u st o me rs

AN -C

D SL C u st o me rs

AN -D D SL

C u st o me rs AN -E D SL

C u st o me rs AN -F

D SL C u st o me rs

AN -G

M P

L S

- P s

e u

d o

w i r

e s

I P o

v e

r P

P P

o E

Pse u d o w i re Ag g re g a t i o n T e l co Syst e ms T M7 2 2 4

PPPo E BR AS / L AC C i sco ASR 1 0 0 0

D SL -Acce ss N o d e (AN ) MPL S T e l co Syst e ms T M7 2 2 4

Sa me MPL S I n f ra st ru ct u re

Intenet IP b a n d w i d t h p o l i cy Q o S e n f o rce me n t I n t e rn e t vs Acce ss N e t w o rk

D SL I P-Se rvi ce -N o d e f o r AN -A-G

Redesign - services considerations PROBLEM:

MAC-Learning on all devices (not only PEs)

Redundancy usually based on STP completely blocking traffic for certain traffic/VLANs to avoid loops

Slow convergence in large networks

Only small network diameter supported

SOLUTION:

Use hierarchical VPLS

MAC learning only at VPLS aggregators required

Point 2 Point Services without MAC-Learning

Redundancy based on routing/MPLS-TE

Unlimited network diameter

Business services redesigned

Pseudowire Aggregation Node B

MPLS CORENetwork Cisco 6500

CustomersAN-A

CustomersAN-B

CustomersAN-C

CustomersAN-D Customers

AN-ECustomers

AN-F

CustomersAN-G

Pseudowire AggregationTelco Systems TM7224

Access Node (AN) MPLSTelco Systems TM7224 or Cisco ME3750

Multipoint to MultipointVPLS Service

Point to Point onlyPseudowire Service

Backup Pseudowire

Pseudowire Aggregation Node A

Why did Silver Server choose Telco Systems MPLS solution

• Small cost-efficent devices for small POPs

• Modular 1/10 GigE Interfaces on SFP/XFP C/DWDM

• Easy to offer Ethernet services

• Seamless support for L2 services over entire network

• Flexible QoS architecture UNI ingress

• Interoperability of different devices / vendors

• Cisco Metro 3750

• Telco Systems T-Metro 7224

• Cisco 6500

Conclusion

Taking MPLS to the Edge - advantages

Scalable

Resiliency

Manageable

Multi protocol support (future proofing)

Field deployment application examples – true multi-service:

Business solutions

Mobile backhaul

Residential backhaul

We invite you to enjoy the full benefits of mature, future-proof and interoperable technology today with Telco’s Systems seamless MPLS solution

Come and see true multi service at

Booth 619 @telcosystems igillath@telco.com