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    Icnd23 s01l01 Icnd23 s01l01 Presentation Transcript

    • Configuring Catalyst Switch Operations Introducing Basic Layer 2 Switching and Bridging Functions © 2006 Cisco Systems, Inc. All rights reserved. ICND v2.3—1-1
    • 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
    • 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
    • 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
    • MAC Address Table • The initial MAC address table is empty. © 2006 Cisco Systems, Inc. All rights reserved. ICND v2.3—1-5
    • 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
    • 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
    • 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
    • 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
    • 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
    • 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
    • © 2006 Cisco Systems, Inc. All rights reserved. ICND v2.3—1-12