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1、 2008 Cisco Systems, Inc. All rights reserved.Cisco Public1Next generation Core Network Architectures and Enabling TechnologiesBRKBBA-3001Lx Renner2 2008 Cisco Systems, Inc. All rights reserved.Cisco PublicClassical Aircraft CockpitSource: http:/ 2008 Cisco Systems, Inc. All rights reserved.Cisco Pu
2、blicNew Glass CockpitSource: http:/ 2008 Cisco Systems, Inc. All rights reserved.Cisco PublicNext generation Core Network Architectures and Enabling Technologies? This presentation will talk about:Requirements of the next gen CoreNext gen Core ArchitecturesAssociated enabling TechnologiesIts about C
3、onvergence in various dimensions5 2008 Cisco Systems, Inc. All rights reserved.Cisco PublicIP-NGN 3.06 2008 Cisco Systems, Inc. All rights reserved.Cisco PublicIP Intelligence Flexibility AdaptabilityServices Differentiation Loyalty RevenueEfficiencies OPEX CAPEX ProfitsControl Service Network Busin
4、essService Provider Needs To Make the Experience Provider Transition7 2008 Cisco Systems, Inc. All rights reserved.Cisco PublicCisco Service Provider VisionConnecting Customers with Services, Services with Networks, and Networks with Each Other VPNsInternetVoice GMPLS later? OAM based on transport c
5、oncept (i.e. AIS/RDI, CV: ITU-T Y.1711 phase 1, quality control still missing - Y17.tom and Y.17tor) Protection switching and Survivability based on ITU-T Y.1720/G.8131 (linear protection switching 1+1, 1:1, shared mesh options) and Y.mrps (ring protection switching) Use same data-link protocol ID (
6、e.g. EtherType), frame format and forwarding semantics as defined for MPLS frames? T-MPLS is another MPLS “pseudowire” (PW) with bi-directional traffic engineered path (see GMPLS)34 2008 Cisco Systems, Inc. All rights reserved.Cisco PublicHow is it Positioned? Next Generation SONET/SDH with tight in
7、tegration to Metro Ethernet and Access: Transport Ethernet frames over point-to- point VCs? Offers a transition path to SPs/Carriers who have a huge SONET/SDH infrastructure and moving toward packetRe-usability of OTN networks without expensive upgrade (e.g. Introduction of control plane might requi
8、re more memory or device forklift)? Next Generation Packet Transport: Layer 2 hollow core Claim: cheaper OPEX, easier to operate and deploy 35 2008 Cisco Systems, Inc. All rights reserved.Cisco PublicT-MPLS Uses MPLS Features but? T-MPLS defined to use “same profile” as MPLS but: Use of bidirectiona
9、l LSPs No Penultimate Hop Popping (PHP) No LSP merging option No FRR support Requires LSP merge No Equal Cost Multiple Path (ECMP)? T-MPLS is a subset of MPLS but Interoperability with existing MPLS platform is a challenge36 2008 Cisco Systems, Inc. All rights reserved.Cisco PublicT-MPLS and IETF MP
10、LS? T-MPLS supporters claim it is a subset of IETF MPLS Pseudo-wire concept, same Ethertype T-MPLS simplifications are covered by the IETF MPLS RFCs? Inter-operability will be challenging Different OAM mechanisms Different signaling protocols for pseudo-wires Different control planes using same Ethe
11、rtype (label management) ? Ciscos position on T-MPLS Existing IETF RFCs and drafts cover the T-MPLS requirements and use cases Why reinvent the wheel Use standards already approved and implemented37 2008 Cisco Systems, Inc. All rights reserved.Cisco PublicWhat is PBT ? Definition: Provider Backbone
12、Transport (PBT) Forwarding Plane: 802.1ah encapsulation from Provider Backbone Bridging Control Plane: An OSS/NMS replaces IEEE control plane elements OAM based on 802.1ag (with modifications) ? Services: P2P connection orientated services only ? Standards: PBT is proprietary PBB-TE in project appro
13、val request (PAR), has just entered the standards Does not assume PBT as a base line Aspiring to be more than PBT, address MP2MP servicesStatically Defined Bridge TablesPrimary PathNetwork Management Control38 2008 Cisco Systems, Inc. All rights reserved.Cisco PublicWho are the Target Customers? A P
14、RIMARY target for PBT are customers with legacy SONET/SDH switching and NMS solutions? Operators who want to offer Ethernet services over Ethernet Infrastructure? Existing operators who currently deploy IEEE 802.1ad (QinQ) Metro Ethernet network and want to evolve to IEEE 802.1ah/PBT network39 2008
15、Cisco Systems, Inc. All rights reserved.Cisco PublicForwarding TablesForwarding TablesForwarding TablesEdge functionsEdge functionsControl PlaneComparing solutions ? Edge functionsConditions customer connectionsVital component but not part of the base transport? Data planeEncapsulation of the packet
16、s and forwarding paradigm? Control planeThe set-up and control of the forwarding plane for different services40 2008 Cisco Systems, Inc. All rights reserved.Cisco PublicForwarding plane Comparison Forwarding TablesForwarding TablesForwarding TablesEdge functionsEdge functions? IP/MPLS Customer packet
