MPLS cisco QOS VPN full mpls migration

MPLS Migration &
Deployment
Jeremy Lawrence
(With a few slides by Tom Downey & Rob
Redford)
Presentation_ID

© 1999, Cisco Systems, Inc.

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Topics

• Why Migrate to MPLS?
• Packet-based MPLS or ATM MPLS?
• IP+ATM Networks & Dual-Backbone Networks
• Introducing MPLS to Existing ATM Networks
• Routing Planning Issues
• Specific Issues for BPX 8600/MGX 8850 Networks
• Full Meshes & Scalability

Presentation_ID

© 2000, Cisco Systems, Inc.

www.cisco.com

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Why Migrate to MPLS?

© 1999, Cisco Systems, Inc.

Cisco Confidential

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Different Solutions for LAN and WAN
Campus LAN

Layer 2 and
Layer 3 LAN
Switching

• Scale Layer 2, 3 to
Gigabit speeds
• Any-to-any
connectivity
• Multimedia support

Multiprotocol
over ATM
(MPOA)

WAN
• Scalability
• Optimize for IP and QoS
• Bandwidth optimization

• IP Virtual Private
Networks
Presentation_ID

© 2000, Cisco Systems, Inc.

MPL
S

www.cisco.com

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MPLS Concepts
Customer sites
run ordinary IP

Customer sites are
connected by Frame
Relay, ATM, SDH,
Cable, xDSL, Dial,
etc.
Presentation_ID
© 2000, Cisco Systems, Inc.

Label Switch
Routers (LSRs):
ATM Switches or
Routers

MPLS in the
Network Core
Edge Label Switch
Routers (LSRs)

www.cisco.com

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Key MPLS Capabilities
RSVP

IP Multicast

IP CoS

IP/ATM Integration

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© 2000, Cisco Systems, Inc.

Traffic Engineering

VPN’s

www.cisco.com

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Traditional IP over ATM

• Put routers around the edge of an ATM network
• Connect routers using Permanent Virtual Circuits
• This does not provide optimal integration of IP
and ATM
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© 2000, Cisco Systems, Inc.

www.cisco.com

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ATM MPLS

• MPLS adds IP Routing
Control to an ATM Switch
• MPLS enables ATM
switches to also act like
routers
Fully support IP, along with
Frame Relay and ATM, on
shared ATM backbone
Provides optimal IP
forwarding capability on an

ATM network

Presentation_ID

© 2000, Cisco Systems, Inc.

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MPLS Brings IP and ATM Together
IP Over ATM
• Complex translation required
• Overhead limits performance
and efficiency

IP
NHRP

NHRP
Server

RFC 1577 ATM ARP
Server

PNNI

Data path

ATM Switch

Cisco
IP+ATM

• No complex translation
• Full IP and ATM capabilities
• Built-in IP routing
Presentation_ID

© 2000, Cisco Systems, Inc.

www.cisco.com

Cisco
IP+ATM
IP
AT
M
Ser
vi
ce
s

Ser
vi
ce
s

IP

PNN
MPL
I
S
IP+ATM
Switch

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IP over ATM Integration
MPLS: IP Fundamentals
• MPLS puts IP services
directly on ATM
switches

RSVP

ATM switches support IP
protocols directly
Avoids complex
translations which occur
with MPOA

• Full support for IP
CoS, soon RSVP, & IP
multicast
Presentation_ID

© 2000, Cisco Systems, Inc.

IP Multicast

www.cisco.com

IP CoS

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Network-Wide Delivery of Services

?
?
• MPOA, similar approaches work only across network cores with:
ATM Switches

• No delivery of advanced services like VPNs over network cores with:
Packet-over-SONET/SDH/WDM
Routers
Switch-Routers

• Very limited migration and interoperability options
Presentation_ID

© 2000, Cisco Systems, Inc.

www.cisco.com

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Network-Wide Delivery of Services

• Tag Switching/MPLS carries advanced services like
VPNs across networks with all equipment types:
ATM
Packet-over-SONET/SDH/WDM
Switches
Routers
Switch-Routers
Presentation_ID

© 2000, Cisco Systems, Inc.

www.cisco.com

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Traffic Engineering
• Motivations:

New Release of
Netscape Software
Link Failure

–Economics
–Failure scenarios

No Physical Link

–Unanticipated traffic

• MPLS Traffic
Engineering deals
with these
operational issues in
IP networks
300 Mbps
155 Mbps Fiber Link
Traffic Flow
Presentation_ID

© 2000, Cisco Systems, Inc.

www.cisco.com

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Virtual Private Networks
Separately engineered
customer private IP
networks

Vs.

Build

once,
sell
once

Single carrier network
supporting multiple
customer IP VPNs

MPLS
Network

Build once,
Sell many
Presentation_ID

© 2000, Cisco Systems, Inc.

www.cisco.com

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VPNs using MPLS & Border
Gateway Protocol (BGP)
Corp A
Site 3

Connectionless
IP VPNs

Corp A
Site 2

VPN Management
by Lists of Members
Intranet A
RD 4

Corp A
Site 1

Privacy without
Tunnels
Presentation_ID

Corp B
Site 1

© 2000, Cisco Systems, Inc.

Intranet
RD 12

Service Provider
VPN Aware Network
www.cisco.com

Corp B
Site 2

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Enhanced Services
Intranets

Extranets
Content

Outsource

Services and
Applications

Managed
Services

Voice

VPN-Aware
Network

Net Commerce
Hosting

Collaborative

MPLS VPN Foundation

TDM

Universal
Access
Presentation_ID

© 2000, Cisco Systems, Inc.

Cable

Dial ATM/FR
www.cisco.com

DSL

IP
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Common Misconceptions

• Myth: MPLS gives major performance benefits
compared to ordinary IP networks
• Reality:
ATM MPLS networks are no faster than traditional ATM
Networks.
ATM MPLS networks are no faster than router-based
networks
Router-based MPLS networks are only a little faster than
Router-based IP networks

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© 2000, Cisco Systems, Inc.

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Common Misconceptions

• Myth: IP has poor Quality-of-Service options,
and MPLS has much better QoS
• Reality: IP networks with DiffServ and RSVP
have largely the same QoS options as MPLS
(ATM or Packet-based)
• MPLS provides only a few minor QoS
advantages compared to state-of-the-art IP
networks
Presentation_ID

© 2000, Cisco Systems, Inc.

www.cisco.com

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MPLS & QoS: A Few Minor
Advantages

• ATM MPLS provides lower delay & jitter than packetbased IP for higher-CoS traffic, e.g. VOIP. This is
significant only with mixed voice and data traffic at
lower trunks speeds: E3/T3 trunks and below.
• MPLS Traffic Engineering can indirectly help with
QoS
• Guaranteed Bandwidth MPLS tunnels are coming,
but this function is similar to a full RSVP-on-IP
implementation

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© 2000, Cisco Systems, Inc.

www.cisco.com

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MPLS Benefits
Benefits of MPLS
IP over
ATM
Integration
Traffic
Engineering

• Better utilization of trunks means lower costs
• Optimise performance of existing networks
• New revenue opportunity for SPs
• Scalability for lower operational costs and faster

rollout
• L2 privacy and performance for IP

VPNs

Presentation_ID

• IP+ATM on the same backbone for economies of
scale
• Keep up with Internet growth
• Reduced complexity for lower operational cost

© 2000, Cisco Systems, Inc.

www.cisco.com

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IP+ATM Networks &
Dual-Backbone Networks

© 1999, Cisco Systems, Inc.

Cisco Confidential

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IP+ATM Networks

• In an IP+ATM network,
both edge and core
switches support:
IP+ATM Edge
Switch

ATM & FR PVC and SVC
services

IP+ATM Core
Switch

MPLS services & VPNs

• All services are fully
integrated on one set of
switches and one set of
links

Presentation_ID

© 2000, Cisco Systems, Inc.

www.cisco.com

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IP+ATM Networks

Unified access to
multiple services
MPLS
Frame Relay/ATM
PVCs & SVCs

Each service runs
“natively” on the ATM Switches
- no overlays
- resources partitioned by service
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© 2000, Cisco Systems, Inc.

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IP+ATM Edge Switches
IP+ATM Edge Switch

MPLS & IP services

Frame Relay/ATM
PVCs & SVCs

Different DLCIs or VCIs on the
same customer link can go to
different

services in the IP+ATM network.
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© 2000, Cisco Systems, Inc.

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Common Situation in Carriers:
Separate Networks
Router Network

• IP part of the carrier has
router network, typically
router and dial access.
Often, this part uses Cisco
equipment.
ATM Network

• Router network may be
running MPLS & VPNs
• Traditional data part of the
carrier has a FR/ATM
network. This part often has
non-Cisco equipment.

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© 2000, Cisco Systems, Inc.

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