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Configuring Catalyst Switch Operations

Introducing Basic Layer 2 Switching and
Bridging Functions

© 2006 Cisco Systems, ...
Outline
• Overview
• Functions of Ethernet Switches and Bridges
• Frame Transmission Modes
• How Switches and Bridges Lear...
Ethernet Switches and Bridges

• Address learning
• Forwarding based on the learned addresses
• Loop avoidance
© 2006 Cisc...
Transmitting Frames
Cut-Through
• Switch checks destination
address and immediately
begins forwarding frame

Store and For...
MAC Address Table

• The initial MAC address table is empty.
© 2006 Cisco Systems, Inc. All rights reserved.

ICND v2.3—1-...
Learning Addresses

• Station A sends a frame to station C.
• The switch caches the MAC address of station A to port E0
by...
Learning Addresses (Cont.)

• Station D sends a frame to station C.
• The switch caches the MAC address of station D to po...
Filtering Frames

• Station A sends a frame to station C.
• The destination is known; the frame is not flooded.
© 2006 Cis...
Filtering Frames (Cont.)

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

• Station D sends a broadcast or multicast frame.
• Broadcast and multicast frames are flo...
Summary
• Ethernet switches and bridges increase the available
bandwidth of a network by creating dedicated network
segmen...
© 2006 Cisco Systems, Inc. All rights reserved.

ICND v2.3—1-12
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Icnd23 s01l01

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Transcript of "Icnd23 s01l01"

  1. 1. Configuring Catalyst Switch Operations Introducing Basic Layer 2 Switching and Bridging Functions © 2006 Cisco Systems, Inc. All rights reserved. ICND v2.3—1-1
  2. 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 © 2006 Cisco Systems, Inc. All rights reserved. ICND v2.3—1-2
  3. 3. Ethernet Switches and Bridges • Address learning • Forwarding based on the learned addresses • Loop avoidance © 2006 Cisco Systems, Inc. All rights reserved. ICND v2.3—1-3
  4. 4. Transmitting Frames Cut-Through • Switch checks destination address and immediately begins forwarding frame Store and Forward • Complete frame is received and checked before forwarding Fragment-Free • Switch checks the first 64 bytes, then immediately begins forwarding frame © 2006 Cisco Systems, Inc. All rights reserved. ICND v2.3—1-4
  5. 5. MAC Address Table • The initial MAC address table is empty. © 2006 Cisco Systems, Inc. All rights reserved. ICND v2.3—1-5
  6. 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). © 2006 Cisco Systems, Inc. All rights reserved. ICND v2.3—1-6
  7. 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). © 2006 Cisco Systems, Inc. All rights reserved. ICND v2.3—1-7
  8. 8. Filtering Frames • Station A sends a frame to station C. • The destination is known; the frame is not flooded. © 2006 Cisco Systems, Inc. All rights reserved. ICND v2.3—1-8
  9. 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. © 2006 Cisco Systems, Inc. All rights reserved. ICND v2.3—1-9
  10. 10. Broadcast and Multicast Frames • Station D sends a broadcast or multicast frame. • Broadcast and multicast frames are flooded to all ports other than the originating port. © 2006 Cisco Systems, Inc. All rights reserved. ICND v2.3—1-10
  11. 11. Summary • Ethernet switches and bridges increase the available bandwidth of a network by creating dedicated network segments and interconnecting the segments. • Switches and bridges use one of three operating modes to transmit frames: store and forward, cut-through, and fragmentfree. • Switches and bridges maintain a MAC address table to store address-to-port mappings so that they can determine the locations of connected devices. • When a frame arrives with a known destination address, the frame is forwarded only on the specific port connected to the destination station. © 2006 Cisco Systems, Inc. All rights reserved. ICND v2.3—1-11
  12. 12. © 2006 Cisco Systems, Inc. All rights reserved. ICND v2.3—1-12
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