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Configuring Catalyst Switch Operations

Introducing Basic Layer 2 Switching and
Bridging Functions
Outline

• Overview
• Functions of Ethernet Switches and Bridges
• Frame Transmission Modes
• How Switches and Bridges Learn Source MAC
  Addresses
• How Switches and Bridges Forward and Filter Frames
• Summary
Ethernet Switches and Bridges




   • Address learning
   • Forwarding based on the learned addresses
   • Loop avoidance
Transmitting Frames

Cut-Through                            Store and Forward
 • Switch checks destination            • Complete frame is received and
   address and immediately                checked before forwarding
   begins forwarding frame




Fragment-Free
 • Switch checks the first 64 bytes,
   then immediately
   begins forwarding frame
MAC Address Table




    • The initial MAC address table is empty.
Learning Addresses




• Station A sends a frame to station C.
• The switch caches the MAC address of station A to port E0
  by learning the source address of data frames.
• The frame from station A to station C is flooded out to all
  ports except port E0 (unknown unicasts are flooded).
Learning Addresses (Cont.)




• Station D sends a frame to station C.
• The switch caches the MAC address of station D to port E3 by
  learning the source address of data frames.
• The frame from station D to station C is flooded out to all ports
  except port E3 (unknown unicasts are flooded).
Filtering Frames




    • Station A sends a frame to station C.
    • The destination is known; the frame is not flooded.
Filtering Frames (Cont.)




   • Station A sends a frame to station B.
   • The switch has the address for station B in the MAC
     address table.
Broadcast and Multicast Frames




    • Station D sends a broadcast or multicast frame.

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Switch function

  • 1. Configuring Catalyst Switch Operations Introducing Basic Layer 2 Switching and Bridging Functions
  • 2. Outline • Overview • Functions of Ethernet Switches and Bridges • Frame Transmission Modes • How Switches and Bridges Learn Source MAC Addresses • How Switches and Bridges Forward and Filter Frames • Summary
  • 3. Ethernet Switches and Bridges • Address learning • Forwarding based on the learned addresses • Loop avoidance
  • 4. Transmitting Frames Cut-Through Store and Forward • Switch checks destination • Complete frame is received and address and immediately checked before forwarding begins forwarding frame Fragment-Free • Switch checks the first 64 bytes, then immediately begins forwarding frame
  • 5. MAC Address Table • The initial MAC address table is empty.
  • 6. Learning Addresses • Station A sends a frame to station C. • The switch caches the MAC address of station A to port E0 by learning the source address of data frames. • The frame from station A to station C is flooded out to all ports except port E0 (unknown unicasts are flooded).
  • 7. Learning Addresses (Cont.) • Station D sends a frame to station C. • The switch caches the MAC address of station D to port E3 by learning the source address of data frames. • The frame from station D to station C is flooded out to all ports except port E3 (unknown unicasts are flooded).
  • 8. Filtering Frames • Station A sends a frame to station C. • The destination is known; the frame is not flooded.
  • 9. Filtering Frames (Cont.) • Station A sends a frame to station B. • The switch has the address for station B in the MAC address table.
  • 10. Broadcast and Multicast Frames • Station D sends a broadcast or multicast frame.