Industry s First QoS- Enhanced MPLS TE Solution

Transcription

1 Industry s First QoS- Enhanced MPLS TE Solution Azhar Sayeed Manager, IOS Product Management, asayeed@cisco.com Contact Info: Kim Gibbons, kgibbons@cisco.com,,

2 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 2

3 MPLS Is The Key Technology for IP Service Delivery IP+ATM MPLS Brings IP and ATM Together Eliminates IP over ATM overhead and complexity One network for Internet, business IP VPNs, and transport ATM Services PNNI IP Services IP MPLS IP+ATM Switch 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 3

4 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 4

5 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 5

6 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 6

7 IP Routing and The Fish R8 R3 R2 R4 R5 R1 R6 R7 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 7

8 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 8

9 Node and Link Protection R8 R3 R4 R9 R2 R1 R5 R6 R7 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 9

10 Cisco MPLS AutoBandwidth Cisco-unique feature! Total bandwidth for all TE tunnels on a path Bandwidth reserved for a TE tunnel using Cisco AutoBandwidth allocator Maximum Bandwidth available to other tunnels Minimum Tunnel resized to traffic rate Time 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 10

11 HQ1 End-to to-end Solution via Cisco IOS Software 5 Mbps 1 Mbps VPN HQ Back-up MPLS TE MPLS VPN VPN and Traffic Engineering Combined to Provide End-to-End Services 11

12 DiffServ Industry Standard Differentiated Services 12

13 The IP QoS Pendulum Time No state Best Effort Aggregated state DiffServ Per-flow state IntServ / RSVP 1. The original IP service 2. First efforts at IP QoS 3. Seeking simplicity and scale 4. Bandwidth Optimization & End-to-End SLAs (IntServ+DiffServ+ Traffic Engineering) 13

14 The Cisco QoS Framework VoIP VoIP Mission Critical Multimedia Video Video Conferencing Conferencing Collaboration Collaboration VPNs VPNs POLICY-BASED POLICY-BASED NETWORKING NETWORKING IntServ DiffServ MPLS MPLS Signaling Signaling Techniques Techniques (RSVP, (RSVP, DSCP, DSCP, ATM ATM (UNI/NNI)) (UNI/NNI)) Congestion Congestion Avoidance Avoidance Techniques Techniques (WRED) (WRED) Congestion Congestion Management Management Techniques Techniques (PQ, (PQ, WFQ, WFQ, LLQ) LLQ) Hybrid Classification Classification & Marking Marking Techniques Techniques (DSCP, (DSCP, IP IP Precedence, Precedence, NBAR, NBAR, etc.) etc.) Traffic Traffic Conditioners Conditioners (Policing, (Policing, Shaping) Shaping) PROVISIONING PROVISIONING & MONITORING MONITORING Link Link Efficiency Efficiency Mechanisms Mechanisms (Compression, (Compression, Fragmentation) Fragmentation) Frame Frame Relay Relay PPP PPP HDLC HDLC SDLC SDLC ATM, POS ATM, POS FE,Gig.E FE,Gig.E 10GE 10GE Wireless Wireless Fixed,Mobile BroadBand BroadBand Cable,xDSL Fixed,Mobile Cable,xDSL 14

15 Differentiated Services The IETF DiffServ Model Use 6 bits in IP header to sort traffic into Behavior Aggregates a.k.a. Classes! RFCs: 2474, 2475, 2597, 2598 Defines a number of Per Hop Behaviors - PHBs Two-Ingredient Recipe: Condition the Traffic at the Edges Invoke the PHBs in the Core Use PHBs to Construct Services such as Virtual Leased Line! 15

16 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 16

17 Integrating QoS and TE DiffServ-Aware TE MPLS Guaranteed Bandwidth Services 17

18 MPLS Guaranteed Bandwidth Services MPLS guaranteed bandwidth services are built by: Extending MPLS traffic engineering Advertise available bandwidth for best-effort traffic Also advertise available bandwidth for highpriority traffic DiffServ-aware TE Using QoS features to guarantee delivery of the highpriority traffic Classification Policing 5 Mbps C2 C1 18

19 Guaranteed Bandwidth Services Target Market Segments For service providers for who lease bandwidth Benefit: Greater utilization of relatively costly/valuable bandwidth ISPs Internet Service Providers ICPs Integrated Communications Providers Other carriers with costly bandwidth For service providers who offer bandwidth services Benefits: Premium classes of service -- revenue Resiliency against failures -- fast rerouting IXEs Interexchange Carriers offering MPLS VPNs $ $ 19

20 Virtual Leased Line (VLL) VLL is one 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 C1 A B C3 C2 10 Mbps C2 >C3 20

21 Toll Bypass Trunking Toll Trunk PSTN Network Class 5 legacy switches GB Tunnel V VoIP Gateway MPLS Network V VoIP Gateway 21

22 Trunking Frame Relay Across an 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 Frame Relay Interface DLCI=177 High Priority DLCI=310 Low Priority MPLS DLCI=215 Frame Relay Interface Frame Relay Interface DLCI=251 22

23 MPLS Guaranteed Bandwidth Conclusions Adds strict Point-to-Point QoS commitment 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) Follow-on developments for flexible Edge Behaviors and advanced GB-TE capabilities will allow additional GB apps 23

24 Cisco Differentiation Extending MPLS traffic engineering with Guaranteed Bandwidth Services Leverage the rich feature set Cisco IOS QoS Cisco-unique AutoBandwidth feature Build point-to-point bandwidth guaranteed services such as Virtual IP leased lines Toll bypass trunks for Voice over IP 24

25 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 MPLS Croup Formally Chartered by IETF Cisco Ships MPLS (Tag Switching) Cisco Ships MPLS TE MPLS VPN Deployed Traffic Engineering Deployed Over 30 Customers in Production Time

26 Cisco 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 26

27 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 27

28 Appendix 28

29 MPLS Technology Overview Main Ideas Separate forwarding information (label) from the content of data (IP header) Single forwarding paradigm (label swapping) multiple routing paradigms Multiple link-specific realizations of the label swapping forwarding paradigm Label, VPI/VCI, Lambda (wavelength) Flexibility of grouping traffic into Forwarding Equivalence Classes (FECs) Forwarding hierarchy via label stacking 29

30 MPLS Technology Overview 1a. Existing Routing Protocols (e.g. OSPF, IS-IS) Establish Reachability to Destination Networks 1b. Label Distribution Protocol (LDP) Establishes Label to Destination Network Mappings LSP 4. Edge LSR at Egress Removes Label and Delivers Packet 2. Ingress Edge LSR Receives Packet, Performs Layer 3 Value-Added Services, and Labels Packets 3. LSR Switches Packets Using Label Swapping 30

31 MPLS Applications MPLS a service enabler Highly-scalable networkbased VPN solution Traffic management IP traffic engineering solution Protection solution with fast re-route Advanced IP services Virtual leased line using guaranteed bandwidth services Integration of diverse technologies IP + ATM IP + Optical IP OPTICAL ATM MPLS 31

32 Defined PHBs Expedited Forwarding (EF): RFC2598 dedicated low delay queue Comparable to Guaranteed B/W in IntServ Assured Forwarding (AF): RFC2597 n queues m drop preferences Comparable to Controlled Load in IntServ Class Selector: Compat. with IP Prec Default (best effort) 32

33 REAL-WORLD DiffServ! EQUANT ANNOUNCES PRIORITY SERVICE FOR URGENT VOICE & DATA TRAFFIC: Real Time Class Optimized for toll quality Voice over IP and time-sensitive applications Interactive Class Designed to give quick response for business critical applications Standard Business Class Suitable for day-to-day business applications, client server traffic and corporate web traffic General Class Ideal for , Internet http traffic and Notes replication For further information see (News from June 8, 2000) 33

34 Acronym Guide AF Assured Forwarding APS 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 Engineering VoIP Voice over IP VPN Virtual Private Network 34

35 2211_11_2000_c1 2000, Cisco Systems, Inc. 35