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802.1D Spanning Tree Compliant switch

802.1D Spanning Tree Compliant switch. Gireesh Shrimali, Jeslin Puthenparambil EE384Y Course Project. Outline. Features System Architecture Hardware Architecture Software Architecture Software-Hardware interaction Test topologies. Features . 8x8 layer 2 switch

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802.1D Spanning Tree Compliant switch

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  1. 802.1D Spanning Tree Compliant switch Gireesh Shrimali, Jeslin Puthenparambil EE384Y Course Project

  2. Outline • Features • System Architecture • Hardware Architecture • Software • Architecture • Software-Hardware interaction • Test topologies

  3. Features • 8x8 layer 2 switch • External SRAM (statically allocated) for packet storage • Performs address learning - Max 4 addresses per port • Implements 802.1D spanning tree protocol running from an external server

  4. System Architecture 48 port commercial switch NetFPGA Server Spanning Tree Server 0 7 NetFPGA 8x8 Switch hardware Packet Gen Spanning Tree Client (s) Hardware part of the project Software part of the project

  5. Hardware Architecture SRAM SRAM UFPGA CFPGA Ethernet Controller

  6. Hardware – UFPGA Block Diagram Memory Interface Address Table CFPGA Interface Address Learning Ingress Data FIFO Status Addr Control Engine to/from Memory to/from CFPGA Egress Data Egress Data

  7. Hardware - Statistics • Hardware Usage on EP20K400EBC652-1 • 50% for logic elements • 52% for pins • Speed: 27MHz • Huge MUX (~50 data inputs) on read data

  8. Software Architecture - Server • 802.1D Spanning Tree Algorithm • Startup – sending BPDUs on the Configured ports • Process Receive BPDUs • Process timer expiries • Sever hardware interface • Controls the complete NetFPGA board • Send register access commands as control packets • Process command responses as control packets • Send/Receive BPDUs with reserved MAC address • Always use port 7 for communication with the hardware • Encapsulate the packets with VLAN-id of the port 7 Server - functions as the spanning tree protocol running with the NetFPGA switch Hardware ST-Server Spanning Tree algorithm BPDUs Server H/W interface Encapsulated Packets to/from hardware

  9. Software Architecture - Client • 802.1D Spanning Tree Algorithm • Startup – sending BPDUs on the Configured ports • Process Receive BPDUs • Process timer expiries • Client hardware interface • Send/Receive BPDUs using standard Spanning Tree broadcast MAC address • Encapsulate the packets with appropriate VLAN-ids Client - functions like an independent switch or router running spanning tree protocol ST-Client Spanning Tree algorithm BPDUs Client H/W interface Encapsulated Packets to/from hardware

  10. Software Hardware Interaction • Server sending a BPDU to the client on port 0 48 port commercial switch NetFPGA Server 0 7 NetFPGA 8x8 Switch hardware DA:AA-7B-C8-BB-00-00, SA:AA-7B-C8-BB-00-0F, VID:15,SAP,BPDU DA:AA-7B-C8-BB-00-00, SA:AA-7B-C8-BB-00-0F, SAP,BPDU DA:01-80-C2-00-00-00, SA:AA-7B-C8-BB-00-0F, SAP,BPDU DA:01-80-C2-00-00-00, SA:AA-7B-C8-BB-00-0F, VID:08,SAP,BPDU

  11. Software Hardware Interaction • Client sending a BPDU to the Server on port 0 48 port commercial switch NetFPGA Server 0 7 NetFPGA 8x8 Switch hardware DA:01-80-C2-00-00-00, SA:AA-7B-C8-BB-00-10, VID:08,SAP,BPDU DA:01-80-C2-00-00-00, SA:AA-7B-C8-BB-00-10, SAP,BPDU DA:AA-7B-C8-BB-00-08, SA:AA-7B-C8-BB-00-00, SAP,BPDU DA:AA-7B-C8-BB-00-08, SA:AA-7B-C8-BB-00-00, VID:15,SAP,BPDU

  12. Test Topologies Simple Topology Topology with loop Client Client Server Server client client

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