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Tag Switching Architecture Overview

Tag Switching Architecture Overview. Qingfeng Zhuge Fangxia Li Xin Jiang. Topic Organization. Part I Tag Switching Architecture -- Qingfeng Zhuge Part II Tag Switching with Multicast, QoS and Flexible Routing -- Xin Jiang Part III Tag Switching Application (ATM) -- Fangxia Li.

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Tag Switching Architecture Overview

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  1. Tag Switching Architecture Overview Qingfeng Zhuge Fangxia Li Xin Jiang

  2. Topic Organization • Part I Tag Switching Architecture -- Qingfeng Zhuge • Part II Tag Switching with Multicast, QoS and Flexible Routing -- Xin Jiang • Part III Tag Switching Application (ATM) -- Fangxia Li

  3. Switching • Data packet forwarding • Resource competition, allocation and release along the data flow path

  4. Why Tag Switching • Higher forwarding performance • Scaling properties of internet routing system • Flexible traffic control • Support evolution to accommodate new and emerging requirement

  5. Tag Switch– A Multi-Protocol Solution • Combine network-layer routing with label-swapping forwarding • Supply flexibility and rich functionality by routing • Supply simplicity and high performance by label-swapping forwarding • A multi-layer integration solution with routers, switches as peer network devices

  6. Tag Switching Architecture

  7. Two components:forwarding and control • Forwarding component -- forward packets based only on tags -- no redundant network-layer header analysis

  8. Cont. • Control component -- a set of software modules used to distribute and maintain the tag information inside a tagged network domain -- different module support different routing protocol

  9. Forwarding component-- a table look-up structure • FIB – a condensed form of routing table, reside in cache • TIB – tags allocated locally for each entry in FIB • TFIB – constructed by both FIB and TIB to implement tag binding

  10. Forwarding component mechanism • Table look-up • Replace the incoming packet’s tag by outgoing tag and interface information • Tag encapsulation

  11. Advantages of forwarding component • Compared to conventional longest match forwarding • Independent of forwarding granularity • Independent of network-layer protocols • A TFIB per switch or per interface or mix of both

  12. Control component • Create tags • Complete the binding between a tag and network-layer routes • Distribute the tag binding information among tag switches

  13. Control component implementation • Piggy-backing an existing control protocol • By special protocol, such as TDP in tag switching

  14. Advantages of control component • Simplify the overall system behavior • Reduce traffic load • Support multiple network-layer routing protocol • Support variety of forwarding granularities: unicast, multicast, flexible routing, QoS routing, RSVP session

  15. Tag distribution mechanisms • Downstream • Downstream on demand • Upstream

  16. Dependencies and constraints • FIB must be get from routing protocol, such as OSPF, BGP • Must support conventional network-layer routing protocol on edge and maybe also some fraction of the tagged network. • Must implement a mechanism for tag distribution

  17. Observation • Tags less than routes in FIB • Tag allocation is driven by control traffic rather and data traffic • Need header analysis and flow classification only on tagged network edge • Decrease the overall complexity and traffic load in the network

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