Thông tin tài liệu
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© 2001, Cisco Systems, Inc.
Industry’s First QoS
Industry’s First QoS
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Enhanced MPLS TE
Enhanced MPLS TE
Solution
Solution
Azhar Sayeed
Azhar Sayeed
Manager, IOS Product Management,
Manager, IOS Product Management, asayeed@cisco.com
Contact Info: Kim Gibbons,
Contact Info: Kim Gibbons, kgibbons@cisco.com
, 408
, 408
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525
525
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4909
4909
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© 2001, Cisco Systems, Inc.
Agenda
Agenda
• MPLS Traffic Engineering (TE)
Technology and Applications
• Why Extend QoS into MPLS TE
• Guaranteed Bandwidth Services
QoS-enhanced MPLS Traffic Engineering
• The Cisco IOS Advantage
• Summary, Comments & Questions
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© 2001, Cisco Systems, Inc.
MPLS Is The Key Technology for
MPLS Is The Key Technology for
IP Service Delivery
IP Service Delivery
IP+ATM Switch
IP+ATM Switch
PNNI
PNNI
MPLS
MPLS
IP
IP
IP+ATM—MPLS Brings IP and ATM Together
IP+ATM—MPLS Brings IP and ATM Together
Network-Based VPNs with MPLS—A Foundation
for Value Added Service Delivery
Network-Based VPNs with MPLS—A Foundation
for Value Added Service Delivery
• Flexible user and service grouping (biz-to-biz)
• Flexibility of IP and the QoS of ATM
• Enables application and content hosting inside each VPN
• Transport independent
• Low provisioning costs enable affordable managed services
• Flexible user and service grouping (biz-to-biz)
• Flexibility of IP and the QoS of ATM
• Enables application and content hosting inside each VPN
• Transport independent
• Low provisioning costs enable affordable managed services
• Eliminates IP “over” ATM overhead and complexity
• One network for Internet, business IP VPNs, and transport
• Eliminates IP “over” ATM overhead and complexity
• One network for Internet, business IP VPNs, and transport
ATM
Services
ATM
Services
IP
Services
IP
Services
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© 2001, Cisco Systems, Inc.
Key Messages
Key Messages
• DiffServ-aware MPLS TE: A powerful
solution for improving network resource
management
• Guaranteed Bandwidth Services:
Assuring value-added services
Better availability with TE, scalable
VPN solution
• Cisco: Leading the industry and market
with advanced, integrated MPLS and QoS
solutions
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© 2001, Cisco Systems, Inc.
What is MPLS Traffic Engineering?
What is MPLS Traffic Engineering?
• Process of routing data traffic in
order to balance the traffic load on
the various links, routers, and
switches in the network
• Key in most networks where multiple
parallel or alternate paths are
available
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© 2001, Cisco Systems, Inc.
Why Traffic Engineering?
Why Traffic Engineering?
• Congestion in the network due to changing traffic patterns
Election news, online trading, major sports events
• Better utilization of available bandwidth
Route on the non-shortest path
• Route around failed links/nodes
Fast rerouting around failures, transparently to users
Like SONET APS (Automatic Protection Switching)
• Virtual IP leased line services
VoIP Toll-Bypass applications, point-to-point bandwidth guarantees
• Capacity planning
TE improves aggregate availability of the network
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© 2001, Cisco Systems, Inc.
R8
R2
R6
R3
R4
R7
R5
R1
IP (Mostly) Uses Destination-Based Least-Cost Routing
Flows from R8 and R1 Merge at R2 and Become Indistinguishable
From R2, Traffic to R3, R4, R5 Use Upper Route
IP (Mostly) Uses Destination-Based Least-Cost Routing
Flows from R8 and R1 Merge at R2 and Become Indistinguishable
From R2, Traffic to R3, R4, R5 Use Upper Route
Alternate Path Under-Utilized
Alternate Path Under-Utilized
IP Routing and The Fish
IP Routing and The Fish
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© 2001, Cisco Systems, Inc.
MPLS TE Application
MPLS TE Application
• Protection solution
Similar to SONET’s automatic protection switching
• Fast re-route
Goal is to match SONET restoral times—50 ms
Locally patch around lost facilities
Locally re-route around failed links/nodes
Strategies
Alternate tunnel (1->1 mapping) or
tunnel within tunnel (n->1 mapping)
How is this done?
Locally re-route traffic onto backup paths when informed
by lower layers (SONET etc.)
The backup paths are pre-established—however,
bandwidth needn’t be double counted
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© 2001, Cisco Systems, Inc.
Node and Link Protection
Node and Link Protection
R8
R2
R6
R3
R4
R7
R1 R5
R9
• Multiple hops can be by-passed. R2 swaps the label which R4
expects before pushing the label for R6
• R2 locally patches traffic onto the link with R6
• Multiple hops can be by-passed. R2 swaps the label which R4
expects before pushing the label for R6
• R2 locally patches traffic onto the link with R6
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© 2001, Cisco Systems, Inc.
Cisco MPLS AutoBandwidth
Cisco MPLS AutoBandwidth
• Automatically increases or decreases bandwidth reserved for an
MPLS TE tunnel based on measured traffic load
Tunnels are resized within a specified range based on actual traffic rates
over time. Both time interval and bandwidth range are configurable.
• Makes it easy to configure and monitor bandwidth for MPLS TE
tunnels
• Automatically increases or decreases bandwidth reserved for an
MPLS TE tunnel based on measured traffic load
Tunnels are resized within a specified range based on actual traffic rates
over time. Both time interval and bandwidth range are configurable.
• Makes it easy to configure and monitor bandwidth for MPLS TE
tunnels
Cisco
Cisco
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unique feature!
unique feature!
Minimum
Maximum
Total
bandwidth
for all TE
tunnels
on a path
Bandwidth reserved for
a TE tunnel using Cisco
AutoBandwidth allocator
Bandwidth
available to
other tunnels
Tunnel
resized to
traffic rate
Time
[...]... Advantage • Shipped MPLS in Cisco IOS software release 11.1CT - July 1998 • First to deploy MPLS in a production network • First to deploy MPLS traffic engineering • First to deploy MPLS VPNs • First to deploy QoS-enhanced MPLS TE • Broadest platform support • Interoperable solution based in standards © 2001, Cisco Systems, Inc 26 Key Messages • DiffServ-aware MPLS TE: A powerful solution for improving... resource management • Guaranteed Bandwidth Services: Assuring value-added services Better availability with TE, scalable VPN solution • Cisco: Leading the industry and market with advanced, integrated MPLS and QoS solutions © 2001, Cisco Systems, Inc 27 Appendix © 2001, Cisco Systems, Inc 28 MPLS Technology Overview — Main Ideas • Separate forwarding information (label) from the content of data (IP header)... Swapping 30 MPLS Applications • MPLS a service enabler • Advanced IP services Highly-scalable networkbased VPN solution • Traffic management IP traffic engineering solution Protection solution with fast re-route Virtual leased line using guaranteed bandwidth services • Integration of diverse technologies IP + ATM IP + Optical IP ATM MPLS OPTICAL © 2001, Cisco Systems, Inc 31 Defined PHBs • Expedited Forwarding...End-to-End Solution via Cisco IOS® Software VPN HQ Back-up 5 Mbps 1 Mbps HQ1 MPLS TE MPLS VPN VPN and Traffic Engineering Combined to Provide End-to-End Services © 2001, Cisco Systems, Inc 11 DiffServ Industry Standard Differentiated Services © 2001, Cisco Systems, Inc 12 The IP QoS Pendulum Time No state Aggregated state Best Effort DiffServ Per-flow state IntServ / RSVP 1 The original IP service 2 First. .. Line! © 2001, Cisco Systems, Inc 15 Cisco IOS DiffServ • Cisco IOS 12.2 are fully compliant with all the Core DiffServ RFCs • Platforms: • C36xx, C72xx, C75xx Now • More Platforms in the Near Future © 2001, Cisco Systems, Inc 16 Integrating QoS and TE DiffServ-Aware TE MPLS Guaranteed Bandwidth Services © 2001, Cisco Systems, Inc 17 MPLS Guaranteed Bandwidth Services • MPLS guaranteed bandwidth services... MPLS Cloud • With CIR guarantees • Adding full CIR support to FRoMPLS: Admission control over CIR via creation of a GB -TE tunnel for sum of all CIRs DLCI=177 High Priority Frame Relay Interface DLCI=215 MPLS Frame Relay Interface DLCI=310 Low Priority Frame Relay Interface DLCI=251 © 2001, Cisco Systems, Inc 22 MPLS Guaranteed Bandwidth Conclusions • Adds strict Point-to-Point QoS commitment over MPLS. .. Automatic Protection Switching • ATM Asynchronous Transfer Mode • DiffServ Differentiated Services • EF Expedited Forwarding • GB -TE Guaranteed Bandwidth Traffic Engineering • IP Internet Protocol • MPLS Multiprotocol Label Switching • PHB Per Hop Behavior • PNNI Private Network to Network Interface • PSTN Public Switched Telephone Network • QoS Quality of Service • SONET Synchronous Optical Network • TE Traffic... example of MPLS guaranteed bandwidth services built using: Core: GB -TE Edge: Existing MPLS TE classification at the edge Policing at the edge to ensure there is no theft of service 5 Mbps C1—>C3 A B C3 C1 C2 10 Mbps C2—>C3 © 2001, Cisco Systems, Inc 20 Toll Bypass Trunking Class 5 legacy switches PSTN Network GB Tunnel Toll Trunk V VoIP Gateway © 2001, Cisco Systems, Inc MPLS Network V VoIP Gateway 21... over MPLS infrastructure • Further step towards enabling MPLS as the multiservice infrastructure Other parallel steps include Fast Reroute, Admission Control of Voice, • Enabler for a whole range of MPLS applications • DiffServ-aware TE is a key Core tool for MPLS Guaranteed Bandwidth Services” • DiffServ-aware TE allows some GB applications (Virtual Leased Line, FRoMPLS CIR, Static Voice Trunks) •... Cisco Systems, Inc 24 Cisco’s MPLS Contribution to IETF • IETF contributions over 50 • Cisco is either the author or the co-author in key IETF MPLS drafts Cisco Calls a BOF at IETF to Standardize Tag Switching Time 1996 MPLS Croup Formally Chartered by IETF Cisco Ships MPLS (Tag Switching) 1997 © 2001, Cisco Systems, Inc 1998 Cisco Ships Traffic Engineering MPLS TE Deployed MPLS VPN Deployed 1999 Over . 2001, Cisco Systems, Inc.
Industry’s First QoS
Industry’s First QoS
-
-
Enhanced MPLS TE
Enhanced MPLS TE
Solution
Solution
Azhar Sayeed
Azhar Sayeed
Manager,. Systems, Inc.
DiffServ
DiffServ
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-
Aware TE
Aware TE
MPLS Guaranteed Bandwidth
MPLS Guaranteed Bandwidth
Services
Services
Integrating QoS and TE
Integrating
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