How to do the link between the different switch.

Posted on 2009-04-16
Last Modified: 2012-05-06
I have an architecture as below:
SW1,2,3,4 are on different bay and have Giga connection.
SW1x,2x,3x,4x has FastEthernet connection.

  SW1                       SW2                        SW3                         SW4
     |                             |                                |                                 |
  SW11                      SW21                     SW31                       SW41
    |                               |                               |
  SW12                      SW22                     SW32
    |                                                               |
  SW13                                                     SW33

I want to know what is the best way to do the connection between each switch using the spanning tree protocol. The more secure and redundant way and no speed loose.
Each SW is a different site linked by fiber

SW1         |-----------  SW2         |---------- SW3            |--------   SW4      |
     |           |                  |               |                 |                |                  |         |
  SW11     |                 SW21       |              SW31          |              SW41    |
    |            |                   |              |                |                 |                  |-------|      
  SW12     |                 SW22------             SW32           |
    |            |                                                   |                 |
  SW13----                                                SW33----------


SW1 ----------------  SW2 ----------------- SW3------------------  SW4    |  
     |                            |                                |                                 |         |
  SW11                     SW21                    SW31                        SW41    |
    |                              |                               |                                   |-----|  
  SW12                     SW22                    SW32          
    |                                                              |                
  SW13                                                  SW33

Or have you better proposition to optimisize the network.
What is the advandtage and disadvantage of each connection.
Question by:croustimiel
    LVL 12

    Accepted Solution

    The first one is better since if SW2 fails, SW21 and SW22 can still access the network through SW3 (same for the rest).

    The only thing you need to worry about is loops. You'll have to do this on managed switches.

    Author Comment

    But with the first solution i loose the benefits of the Gigabit link between each bay.
    Because on the bay the different swith are linked by 100Mbit links.

    Or can I link as below on each bay or other solution ?
          Gbit                           Gbit                                        Gbit
     |          /       |       \ Mbit                               /       |       \                   |
     |    SW11   SW12  SW13                  SW21   SW22  SW23           |

    What can I use to have more security and performance. Or an other solution.
    For example what is preconised by Cisco to link differnt bay and stack switch ??????

    Author Comment

    No proposition to my question ??

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