Capitalizing on New Standards for ATM to MPLS Convergence

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Capitalizing on New Standards for ATM to MPLS
Convergence
John Sax, CTO, Data Networking Group, Lucent
Technologies Dr. Kireeti Kompella, Distinguished
Engineer, Juniper Networks Mark Bieberich,
Program Manager, The Yankee Group
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Market Drivers for ATM to MPLS Interworking
Standards

• CAPEX and OPEX constraints necessitate phased
  migration to a converged IP/MPLS network.
• Wholesale replacement of Layer 2 Edge is not
  economically feasible.
• Carriers must sustain profitable FR/ATM service
  revenue during the IP/MPLS core consolidation
  process.
• Todays FR/ATM service customers require QoS and
  SLAs to remain intact as traffic migrates to
  IP/MPLS core.
• Carriers must achieve operational parity between
  ATM and MPLS network domains.
• Layer 2 service provisioning and management
  processes must be preserved in an IP/MPLS network
  environment.
• Inherent reliability characteristics of ATM must
  remain intact as traffic migrates to the IP/MPLS
  core.
• ATM signaling and protection mechanisms remain
  essential to service and network reliability.

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IP/MPLS Convergence ATM - MPLS Interworking
Occurs in Phase II
INITIATION SERVICE PROFIT ADOPTION REALIZA
TION
Phase I Announcement of IP/MPLS
consolidation plan Initial investment in IP/MPLS
core begins first phase of core POPs upgraded or
deployed New enterprise, residential
IP- based services targeted
Phase II Core expansion continues edge
investment accelerates Targeted services from
Phase I experience high revenue
growth Limited number of legacy routers and
switches decommissioned
Phase III Critical mass of traffic from
overlay networks now converged to IP/MPLS
core Enterprise and residential IP-based
services proliferate Profitability goals of
IP-based services achieved
2003 1H04 1H04
1H06 1H06 2008
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Layer 2 Traffic Migration to IP/MPLS
CoreAccelerating the Need for ATM to MPLS
Interworking

• Recent Yankee Group Research
• Aggressive service providers plan to migrate up
  to 50 percent of their FR/ATM service traffic to
  the IP/MPLS Core in the next 3 years.

Rate of Traffic Migration From ATM to MPLS
Core
30
27
25
20
14
15
10
4
5
taken from an 04 Yankee Group survey of 15 top
service providers worldwide
0
2004
2005
2006
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ATM to MPLS Interworking Standards Requirement
for Protecting Profitable Services

• Plans for IP/MPLS network consolidation must
  embrace standards that protect growing,
  profitable revenue streams.

North America FR/ATM Service Revenue Forecast
Source the Yankee Group, 2004
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Poll 1 Which business driver is most important
to your plans for adopting standards-based ATM to
MPLS interworking?

1. Minimizing CAPEX and OPEX while consolidating
   networks
2. Sustaining profitable FR/ATM service revenue with
   QoS
3. Achieving operational parity between ATM and MPLS
   network domains
4. Preserving network reliability characteristics of
   ATM as traffic migrates to MPLS

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Together, Lucent and Juniper Drive for
standardized, scalable ATM to MPLS Interworking

• Lucent - Juniper Multiservice MPLS Core solution,
  jointly developed, implements MPLS standards to
  deliver ATM over MPLS interworking
• Standards-based, dynamic interworking between ATM
  and MPLS
• Scalable methods to distribute ATM routing
  information across the MPLS network
• Lucent and Juniper contributions to the MPLS/FR
  Alliance efforts build upon our joint
  Multiservice MPLS Core Solution (Releases 1 and
  2)
• MPLS/FR Alliance progress
• Distributed Model for ATM to MPLS Interworking
• Virtual Trunks for scaling ATM networks across an
  MPLS core
• Multi-protocol Border Gateway Protocol (MP-BGP)
  for ATM address reachability information

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ATM to MPLS Interworking StandardsMPLS/FR
Alliance - Integrated Model, Option 1

• Router performs both ATM routing and signaling
  and MPLS path setup.
• Label Edge Router (LER) must scale 1,000s of ATM
  VPs into MPLS Pseudowire, only one opportunity to
  aggregate services.
• Separate network management systems must be
  integrated.

Combined management of ATM and MPLS networks
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ATM to MPLS Interworking StandardsMPLS/FR
Alliance - Integrated Model, Option 2

• Adds a third network element a hybrid that
  combines both switching and routing.
• Requires a router in the core of the network.
• Three box solution, requires significant
  incremental investment.
• Separate network management systems must be
  integrated.

Three Boxes Needed in Network
Label Edge Router (LER)
Label Edge Router (LER)
Existing ATM Network
MPLS Network
ATM Switch
160G New Hybrid Network Element
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ATM to MPLS Interworking Standards MPLS/FR
Alliance Distributed Model, Option 3Based on
Lucent - Juniper Multiservice MPLS Solution,
Available Today

• Distributed functionality on existing ATM
  switches, and Routers - allows service provider
  to leverage existing assets with minimal
  incremental investment.
• Preserves ATM functions on the ATM switch
  (requires limited software upgrades to existing
  switches), and the routing functions on the
  router.
• MPLS router (LER) is not needed to support ATM
  signaling and routing, or interwork individual
  VCs or VPs.
• ATM switches aggregate VPs into a Virtual Trunk
  before sending to MPLS router .

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ATM to MPLS Interworking Standards
Signaling and Data Plane Scaling IssuesExisting
Networks

• Issue 11 VC/VP to LSP Mapping
• 11 VP to LSP association requires interworking
  each ATM VP with a single MPLS path.
• Creates signaling and data plane scalability
  issues.

Requires interworking each ATM VP with each MPLS
path
CBR VP
1 mbps
VBR rt VP
5 mbps
10 mbps
VBR nrt VP
30 mbps
UBR VP
LSP
POS Interface on Router
ATM Interface On Switch
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ATM to MPLS Interworking Standards Solving
Signaling ScalabilityNew Standards Progress with
Virtual Trunks
New Standards progress Virtual Trunk Concept

• Solution
• Perform VP bundling to aggregate ATM VPs into an
  ATM Virtual Trunk before sending to the LER.
• Simplify scaling of ATM VPs across MPLS core.
• Groom 1000s of VCs into virtual trunks for
  transport across MPLS core.

Aggregation of 1000s VPs into Virtual trunks
with automatic provisioning
CBR VP
1 mbps
VBR rt VP
5 mbps
10 mbps
VBR nrt VP
30 mbps
UBR VP
Virtual Trunk
LSP
POS Interface on Router
ATM Interface On Switch
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Lucent/Juniper Multiservice MPLS Core
SolutionDelivering ATM QoS and SLAs

• Bundles ATM QoS priorities into single Trunk VPN
  label/Pseudo Wire
• QoS treatment of traffic Emulates ATM
• Facilitates bandwidth sharing amongst service
  classes
• Maintains cell loss priority

QoS Flows Based on EXP Bits
MPLS Label
CBR
8
20
3
1
VBR rt
LABEL
Exp
S
TTL
VBR nrt
32 bits 4 bytes (octets)
Trunk VPN Label (Pseudo Wire)
ABR/UBR
PE to PE E-LSPs (PSN Tunnel)
Queues
POS Interface (Router)
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ATM to MPLS Interworking Standards Routing
Scaling IssuesExisting Networks Require Full
Mesh ATM Routing Across MPLS Core
ATM switches support a limited number of
adjacencies, limiting scalability.

• Issue Connecting large numbers of ATM sub
  networks over an MPLS core.
• Must transport ATM routing information through an
  MPLS network.
• ATM switches need to maintain routing adjacencies
  with all other ATM switches through MPLS core.

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ATM to MPLS Interworking StandardsSolving
Routing Scaling IssuesNew Standards Progress
with MP-BGP

• Solution Use Multiprotocol-Border Gateway
  Protocol (MP-BGP) for ATM address reachability
  information
• Enables ATM network to import and export ATM
  address information through the MPLS core by
  exchanging information with a single edge router
• Increases scalability by reducing ATM adjacencies
  without sacrificing full connectivity
• Utilizes MP-BGPs proven scalability for IP VPNs
  and Internet routing
• Simplifies administration by leveraging one
  protocol (BGP) for multiple services

New Standards progress MP-BGP to distribute
ATM routing information
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Lucent - Juniper Partnership Unified Standards
Efforts, Unified Solutions

• MPLS/FR Alliance Distributed Model for ATM to
  MPLS Interworking increases scalability and
  manageability by
• Separating ATM signaling from the MPLS network to
  achieve higher scalability
• Giving providers a solution for aggregating ATM
  traffic over the MPLS network
• Distributing ATM address information in a
  scalable fashion
• Release 2 of Multiservice MPLS Solution
  architected to fully realize ATM to MPLS
  interworking standards
• Solution also allows service providers to
  maintain standard ATM and MPLS service
  restoration and fault management tools
• Lucent and Juniper together will promote progress
  to other standards bodies including IETF, ITU-T
  for adoption

Lucent Juniper Standards Based ATM to MPLS
Interworking
MP-BGP for ATM routing information
Distributed Architecture
FR, ATM Services
FR, ATM Services
Virtual Trunk
T-series
T-series
M320
CBX 500
CBX 500
M/E
M/E
CBX 3500
GX 550
IP Services
IP Services
EthernetServices
EthernetServices
Lucent OSS Software
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Poll 2 What is your top concern with respect to
deploying standards-based ATM to MPLS?

1. Preserving quality of service over the MPLS core
2. Scaling ATM connections over the MPLS core
3. Dynamic signaling between the ATM and MPLS
   networks
4. Preserving network reliability end to end

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Standards Enable Convergence Today Converge the
Best of Both Worlds to ProfitToday and Tomorrow

• Standards minimize OPEX by preserving established
  network management processes reduces incremental
  CAPEX
• MPLS/FR Alliance Distributed Model maximizes the
  utility of existing assets and separates ATM and
  MPLS operational boundaries.
• Standards maintains QoS in a scalable fashion
  through the IP/MPLS core preserves operational
  parity between ATM and IP/MPLS domains
• Use of Virtual Trunks improves network
  scalability and simplifies the provisioning
  process.
• Standards ensure reliable control plane
  operations by standardizing on a common protocol
  for address distribution
• Advancements in standards such as MP-BGP solve
  routing scalability issues.

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Questions Answers
John Sax, CTO, Data Networking Group, Lucent
TechnologiesDr. Kireeti Kompella, Distinguished
Engineer, Juniper NetworksMark Bieberich,
Program Manager, The Yankee Group