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Slide title In CAPITALS 50 pt Slide subtitle 32 pt Protection concerns using Switched Ethernet as internal bus for a Telecommunication Network Element.

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Presentation on theme: "Slide title In CAPITALS 50 pt Slide subtitle 32 pt Protection concerns using Switched Ethernet as internal bus for a Telecommunication Network Element."— Presentation transcript:

1 Slide title In CAPITALS 50 pt Slide subtitle 32 pt Protection concerns using Switched Ethernet as internal bus for a Telecommunication Network Element Jukka Lehtniemi 25 March, 2008 Supervisor: Professor Jörg Ott Instructors: LicPhil Stefan Wiklund MSc Juha Eloranta

2 Top right corner for field-mark, customer or partner logotypes. See Best practice for example. Slide title 40 pt Slide subtitle 24 pt Text 24 pt Bullets level 2-5 20 pt Master's Thesis PresentationJukka Lehtniemi2008-03-252 Outline  Introduction  Telecommunication Computer and AdvancedTCA  Evolution of Ethernet Technology  Spanning Tree Protocol  Other Link Protection Technologies  Network Element Topology Considerations  Link Protection Solutions for Network Element  Conclusions

3 Top right corner for field-mark, customer or partner logotypes. See Best practice for example. Slide title 40 pt Slide subtitle 24 pt Text 24 pt Bullets level 2-5 20 pt Master's Thesis PresentationJukka Lehtniemi2008-03-253 Introduction  Is a switched Ethernet based internal bus good enough solution in terms of link protection in a telecommunication network element?  Different link protection mechanisms available and the suitability for use as a telecommunication element internal bus  The network node architecture is assumed according to the AdvancedTCA specification  Literature study & comparison

4 Top right corner for field-mark, customer or partner logotypes. See Best practice for example. Slide title 40 pt Slide subtitle 24 pt Text 24 pt Bullets level 2-5 20 pt Master's Thesis PresentationJukka Lehtniemi2008-03-254 Telecommunication Computer  Multiprocessor computing cluster  Variety of different processors: general purpose processors, network processors, DSPs etc.  Variety of different network interfaces: TDM, ATM, Ethernet  Redundancy  Modular board & subrack architecture in a server cabinet  Resources connected together by internal (switched) bus Boards Inter Subrack Link Subrack Backplane

5 Top right corner for field-mark, customer or partner logotypes. See Best practice for example. Slide title 40 pt Slide subtitle 24 pt Text 24 pt Bullets level 2-5 20 pt Master's Thesis PresentationJukka Lehtniemi2008-03-255 Advanced Telecommunication Computing Architecture  Open hardware framework  Specified by PCI Industrial Computer Manufacturers Group - a consortium of over 450 hardware manufacturers  Designed for reliability concerned applications  Mechanical design, platform management, data transport etc.  Flexible and loose specifications: profiled further by SCOPE Alliance  AdvancedTCA specifies two subrack level interconnection busses: base interface and fabric interface.  Ethernet is the selected technology for the base interface. It is generally also seen as the most promising candidate for the fabric interface

6 Top right corner for field-mark, customer or partner logotypes. See Best practice for example. Slide title 40 pt Slide subtitle 24 pt Text 24 pt Bullets level 2-5 20 pt Master's Thesis PresentationJukka Lehtniemi2008-03-256 Ethernet Evolution: Shared Bus Collision Domain

7 Top right corner for field-mark, customer or partner logotypes. See Best practice for example. Slide title 40 pt Slide subtitle 24 pt Text 24 pt Bullets level 2-5 20 pt Master's Thesis PresentationJukka Lehtniemi2008-03-257 Ethernet Evolution: Switched Bus Collision Domains Full Duplex – CSMA/CD disabled

8 Top right corner for field-mark, customer or partner logotypes. See Best practice for example. Slide title 40 pt Slide subtitle 24 pt Text 24 pt Bullets level 2-5 20 pt Master's Thesis PresentationJukka Lehtniemi2008-03-258 Ethernet Evolution  The Ethernet technology has evolved from a simple media sharing LAN solution to a versatile and diverse family of frame based computer networking technologies.  From the user protocol perspective it still provides a transparent and compatible frame transmission service  Key enhancements –Switching –Microsegmentation –Full Duplex –Flow Control –Virtual LANs –Connectivity Fault Management

9 Top right corner for field-mark, customer or partner logotypes. See Best practice for example. Slide title 40 pt Slide subtitle 24 pt Text 24 pt Bullets level 2-5 20 pt Master's Thesis PresentationJukka Lehtniemi2008-03-259 Spanning Tree Protocol  Topology loops in a switched Ethernet LAN will cause frame multiplication and thus they are unacceptable  The Spanning Tree Protocol (STP) operated by the switches will eliminate such loops by blocking redundant links in the physical topology and restricting the active topology to a simply and fully connected tree  STP provides topology recovery in the case of link failure. This can be used as a link protection solution

10 Top right corner for field-mark, customer or partner logotypes. See Best practice for example. Slide title 40 pt Slide subtitle 24 pt Text 24 pt Bullets level 2-5 20 pt Master's Thesis PresentationJukka Lehtniemi2008-03-2510 Spanning Tree Protocol  STP propagates the topology information by continuous transmission of distance vectors  New protocol version called Rapid STP (RSTP) has been standardized  Proposal-agreement based communication of RSTP responds faster to topology changes  Multiple STP (MSTP) protocol defines per VLAN spanning trees

11 Top right corner for field-mark, customer or partner logotypes. See Best practice for example. Slide title 40 pt Slide subtitle 24 pt Text 24 pt Bullets level 2-5 20 pt Master's Thesis PresentationJukka Lehtniemi2008-03-2511 Link Aggregation  Link Aggregation is defined by IEEE 802.3  Allows bundling multiple physical links to a single logical link  Bandwidth extension  Redundancy Link Aggregate

12 Top right corner for field-mark, customer or partner logotypes. See Best practice for example. Slide title 40 pt Slide subtitle 24 pt Text 24 pt Bullets level 2-5 20 pt Master's Thesis PresentationJukka Lehtniemi2008-03-2512 Resilient Packet Ring  RPR is specified by IEEE 802.17  Dual Ring topology  Service priorities and fairness  Topology discovery and continuity check  Healing strategies: Steering and Wrapping  50 ms protection time against link failure Span Failure Update! Steering Wrapping

13 Top right corner for field-mark, customer or partner logotypes. See Best practice for example. Slide title 40 pt Slide subtitle 24 pt Text 24 pt Bullets level 2-5 20 pt Master's Thesis PresentationJukka Lehtniemi2008-03-2513 Ethernet Protection Switching  ITU-T Rec. G.8031 / Y.1342  Linear Protection Switching  VLAN based  Point-to-Point connections  Failure detection by Ethernet CFM

14 Top right corner for field-mark, customer or partner logotypes. See Best practice for example. Slide title 40 pt Slide subtitle 24 pt Text 24 pt Bullets level 2-5 20 pt Master's Thesis PresentationJukka Lehtniemi2008-03-2514 Ethernet Automatic Protection Switching  By Extreame Networks  Switched Ethernet, Ring topology  One way transmission: primary port transmitting and secondary port blocking  Continuous health check polling by Master Node  Recovery based on filtering database flush ordered by Master Node and standard Ethernet address learning mechanisms

15 Top right corner for field-mark, customer or partner logotypes. See Best practice for example. Slide title 40 pt Slide subtitle 24 pt Text 24 pt Bullets level 2-5 20 pt Master's Thesis PresentationJukka Lehtniemi2008-03-2515 AdvancedTCA Subrack  Two switch boards (per interface)  Dual Star topology  BASE-T specified, BASE-KX or BASE-KR likely in future  8 uplink/interconnect ports per switch board defined by SCOPE

16 Top right corner for field-mark, customer or partner logotypes. See Best practice for example. Slide title 40 pt Slide subtitle 24 pt Text 24 pt Bullets level 2-5 20 pt Master's Thesis PresentationJukka Lehtniemi2008-03-2516 5 Subrack Topology: Bus & Ladder

17 Top right corner for field-mark, customer or partner logotypes. See Best practice for example. Slide title 40 pt Slide subtitle 24 pt Text 24 pt Bullets level 2-5 20 pt Master's Thesis PresentationJukka Lehtniemi2008-03-2517 5 Subrack Topology: Star

18 Top right corner for field-mark, customer or partner logotypes. See Best practice for example. Slide title 40 pt Slide subtitle 24 pt Text 24 pt Bullets level 2-5 20 pt Master's Thesis PresentationJukka Lehtniemi2008-03-2518 5 Subrack Topology: Full Mesh

19 Top right corner for field-mark, customer or partner logotypes. See Best practice for example. Slide title 40 pt Slide subtitle 24 pt Text 24 pt Bullets level 2-5 20 pt Master's Thesis PresentationJukka Lehtniemi2008-03-2519 5 Subrack Topology: Ring

20 Top right corner for field-mark, customer or partner logotypes. See Best practice for example. Slide title 40 pt Slide subtitle 24 pt Text 24 pt Bullets level 2-5 20 pt Master's Thesis PresentationJukka Lehtniemi2008-03-2520 Link Protection Solutions for Multisubrack AdvancedTCA Network Element: Requirements  Primary requirement: < 50 ms protection switching time  Manageable complexity  Reasonable design, manufacturing and maintainance costs

21 Top right corner for field-mark, customer or partner logotypes. See Best practice for example. Slide title 40 pt Slide subtitle 24 pt Text 24 pt Bullets level 2-5 20 pt Master's Thesis PresentationJukka Lehtniemi2008-03-2521 Solutions  Link Aggregation  Ethernet Protection Switching  Ethernet Automatic Protection Switching  Redundant Packet Ring  Physically Distinct Switching Planes  (Rapid) Spanning Tree Point-to-point: Too fine grained (complex) total solution Master Node is a single point of failure No guaranteed switch over time < 50 ms

22 Top right corner for field-mark, customer or partner logotypes. See Best practice for example. Slide title 40 pt Slide subtitle 24 pt Text 24 pt Bullets level 2-5 20 pt Master's Thesis PresentationJukka Lehtniemi2008-03-2522 Recommended solutions: RPR  Guaranteed switch over time  No need for protection switching supervision clients on the boards: A board may transmit using either of the subrack bridges at any time  Extendibility: no practical restrictions on the amount of subracks to be connected to the ring interconnect  Equipment prices are presumable higher  Additional LAN technology layer and tunnelling of Ethernet frames on the ring

23 Top right corner for field-mark, customer or partner logotypes. See Best practice for example. Slide title 40 pt Slide subtitle 24 pt Text 24 pt Bullets level 2-5 20 pt Master's Thesis PresentationJukka Lehtniemi2008-03-2523 Recommended solutions: Physically Distinct Switch Planes  Pure Ethernet solution  Prices of the equipment probably lower  Topology extension by number of subracks in case of the redundant star topology may require additional interface boards in central subrack  Supervision and switch-over mechanism needs to be in place on each board

24 Top right corner for field-mark, customer or partner logotypes. See Best practice for example. Slide title 40 pt Slide subtitle 24 pt Text 24 pt Bullets level 2-5 20 pt Master's Thesis PresentationJukka Lehtniemi2008-03-2524 Conclusions  Variety of link protection solutions for Ethernet exists  Most of them do not meet the requirements for a telecommunication network element  Recommended solutions identified by the study: –RPR interconnect –Construct of redundant, distinct, loopfree switching planes  Further analyzing of these alternatives with proper simulations or real hardware testing is suggested

25 Top right corner for field-mark, customer or partner logotypes. See Best practice for example. Slide title 40 pt Slide subtitle 24 pt Text 24 pt Bullets level 2-5 20 pt Master's Thesis PresentationJukka Lehtniemi2008-03-2525

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