802.1D Spanning Tree Compliant switch - PowerPoint PPT Presentation

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802.1D Spanning Tree Compliant switch

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802.1D Spanning Tree Compliant switch Gireesh Shrimali, Jeslin Puthenparambil EE384Y Course Project Outline Features System Architecture Hardware Architecture ... – PowerPoint PPT presentation

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Title: 802.1D Spanning Tree Compliant switch


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
Ethernet Controller
CFPGA
UFPGA
6
Hardware UFPGA Block Diagram
Memory Interface
CFPGA Interface
Address Table
Address Learning
Ingress Data
FIFO Status
Control Engine
Addr
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
Server - functions as the spanning tree protocol
running with the NetFPGA switch Hardware
  • 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

ST-Server
Spanning Tree algorithm
BPDUs
Server H/W interface
Encapsulated Packets to/from hardware
9
Software Architecture - Client
Client - functions like an independent switch or
router running spanning tree protocol
ST-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

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
DAAA-7B-C8-BB-00-00, SAAA-7B-C8-BB-00-0F,
VID15,SAP,BPDU

DAAA-7B-C8-BB-00-00, SAAA-7B-C8-BB-00-0F,
SAP,BPDU
DA01-80-C2-00-00-00, SAAA-7B-C8-BB-00-0F,
SAP,BPDU
DA01-80-C2-00-00-00, SAAA-7B-C8-BB-00-0F,
VID08,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
DA01-80-C2-00-00-00, SAAA-7B-C8-BB-00-10,
VID08,SAP,BPDU

DA01-80-C2-00-00-00, SAAA-7B-C8-BB-00-10,
SAP,BPDU
DAAA-7B-C8-BB-00-08, SAAA-7B-C8-BB-00-00,
SAP,BPDU
DAAA-7B-C8-BB-00-08, SAAA-7B-C8-BB-00-00,
VID15,SAP,BPDU
12
Test Topologies
Simple Topology
Topology with loop
Client
Client
Server
Server
client
client
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