Table of Contents
Part III: Transmission and Reception
10.7. Processing the NET_RX_SOFTIRQ: net_rx_action..............................................................82
Chapter 11. Frame Transmission...........................................................................................................82
Figure 11-1. Scheduling a device: (a) for reception (RX); (b) for transmission (TX)....................89
11.1. Enabling and Disabling Transmissions..................................................................................94
Chapter 12. General and Reference Material About Interrupts.............................................................95
12.1. Statistics..................................................................................................................................97
12.2. Tuning via /proc and sysfs Filesystems................................................................................109
12.3. Functions and Variables Featured in This Part of the Book.................................................109
12.4. Files and Directories Featured in This Part of the Book......................................................110
Chapter 13. Protocol Handlers.................................................................................................................1
13.1. Overview of Network Stack.....................................................................................................1
13.2. Executing the Right Protocol Handler......................................................................................1
13.3. Protocol Handler Organization.................................................................................................3
13.4. Protocol Handler Registration..................................................................................................4
13.5. Ethernet Versus IEEE 802.3 Frames........................................................................................4
13.6. Tuning via /proc Filesystem.....................................................................................................6
13.7. Functions and Variables Featured in This Chapter..................................................................6
13.8. Files and Directories Featured in This Chapter........................................................................9
Part IV: Bridging..............................................................................................................................................13
Chapter 14. Bridging: Concepts.............................................................................................................14
14.1. Repeaters, Bridges, and Routers.............................................................................................15
14.2. Bridges Versus Switches........................................................................................................17
14.3. Hosts.......................................................................................................................................23
14.4. Merging LANs with Bridges..................................................................................................27
14.5. Bridging Different LAN Technologies..................................................................................31
14.6. Address Learning...................................................................................................................37
14.7. Multiple Bridges.....................................................................................................................43
Chapter 15. Bridging: The Spanning Tree Protocol..............................................................................47
15.1. Basic Terminology.................................................................................................................49
15.2. Example of Hierarchical Switched L2 Topology...................................................................50
15.3. Basic Elements of the Spanning Tree Protocol......................................................................52
15.4. Bridge and Port IDs................................................................................................................53
15.5. Bridge Protocol Data Units (BPDUs)....................................................................................56
15.6. Defining the Active Topology................................................................................................57
15.7. Timers.....................................................................................................................................61
15.8. Topology Changes..................................................................................................................62
15.9. BPDU Encapsulation..............................................................................................................63
15.10. Transmitting Configuration BPDUs.....................................................................................63
15.11. Processing Ingress Frames...................................................................................................64
15.12. Convergence Time...............................................................................................................65
15.13. Overview of Newer Spanning Tree Protocols......................................................................65
Chapter 16. Bridging: Linux Implementation........................................................................................68
16.1. Bridge Device Abstraction.....................................................................................................69
16.2. Important Data Structures......................................................................................................70
16.3. Initialization of Bridging Code...............................................................................................71
16.4. Creating Bridge Devices and Bridge Ports.............................................................................73
16.5. Creating a New Bridge Device...............................................................................................75
16.6. Bridge Device Setup Routine.................................................................................................80
16.7. Deleting a Bridge....................................................................................................................80
16.8. Adding Ports to a Bridge........................................................................................................90
Understanding Linux Network Internals
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