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This Question is Not Answered 1 Correct Answer available (4 pts) 2 Helpful Answers available (2 pts)
33887 Views 10 Replies Latest reply: May 21, 2014 6:47 PM by Chandan Singh Takuli RSS

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Switch Vs. Bridge

Mar 29, 2012 8:59 PM

Ashiq 92 posts since
Apr 6, 2011

What is the major difference between a switch and a bridge ?

I am aware that they both are Layer 2 devices and they are both hardware based devices, Can someone give me an example where actually a bridge is used.

 

Thanks in advance

  • Steven Williams 3,570 posts since
    Jan 26, 2009
    Currently Being Moderated
    1. Mar 29, 2012 9:34 PM (in response to Ashiq)
    Re: Switch Vs. Bridge

    A bridge looks at the destination of the frame before sending, if the destination address is not on the other side of the bridge it will not transmit the data across. This helps break up one large broadcast domain into 2 by using one bridge device.

     

    A switch has multiple ports in which each port is its own collision domain, a switch will determine the source and destination of the incoming data and switch it to the port it needs to go to. Switch ports can be broken into many separate broadcast domains using vlans. A switch is more efficient in today's large networks.

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  • jneiberger 465 posts since
    Jun 10, 2010
    Currently Being Moderated
    3. Mar 29, 2012 10:39 PM (in response to Ashiq)
    Re: Switch Vs. Bridge

    There is no difference except for the number of ports. A switch is nothing more than a multiport bridge.

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  • Elvin Arias 2,509 posts since
    Mar 12, 2010
    Currently Being Moderated
    4. Mar 30, 2012 5:11 AM (in response to Ashiq)
    Re: Switch Vs. Bridge

    The bride is very software-dependent, but the switch is not. The switch use more sophisticated methods like ASICs. The port density is higher on switches,

     

    Elvin

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  • Selvin 6 posts since
    Sep 5, 2012
    Currently Being Moderated
    5. May 21, 2014 5:16 PM (in response to Ashiq)
    Re: Switch Vs. Bridge

    A bridge make its decision in software (done by the Main Processor) and a switch make is decision in hardware.

     

    When we say anything is  done in the hardware it means that it's not done by the Main Processor.

     

    A bridge has one instance of spanning tree.. switch as mulitple instance of Spanning Tree.

     

    Bridge Supports only one VLAN

    Switch Supports multiple VLAN - one spanning tree per-Vlan.

     

    Bridge...Design to connect multiple network

    Switch...Design to connect End devices

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  • alib_15 234 posts since
    May 3, 2011
    Currently Being Moderated
    6. May 21, 2014 6:20 PM (in response to Selvin)
    Re: Switch Vs. Bridge

    Hmm .. not sure about that bit "Bridge Supports only one VLAN" and "A bridge has one instance of spanning tree".

     

    Cisco WAPs are often referred to as bridges and they support many VLANs.

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  • Currently Being Moderated
    7. May 21, 2014 6:47 PM (in response to Ashiq)
    Re: Switch Vs. Bridge

    Hi Ashiq

     

    2 Major difference:

     

    1 -> Every port of bridge is connected to a shared common memory And port sends data to each other through that memory only. so it will be a bottle neck.just like a hub & spoke topology. where hub is common memory & spokes are port. Where as in switches every port is connected to every other port on switch creating a mesh topology and every port is also connected to the ASIC.

     

    2-> Bridges are software based where as switches are hardware based. for example: bridge functionality works like Windows running over a pc where as switches like BIOS runs on a pc.

     

    HTH

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