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Switch connection issues

By dannydy ยท 10 replies
Mar 5, 2008
  1. i've one server,and two switchs,my server is connected to two switchs. my computer was connected to switch 1,if switch 1 has failed, will my computer still connected using switch 2(Which mean i didnt switch the calbe to switch 2,because both switchs were located in remote area). i'm using the same port number.
  2. Nodsu

    Nodsu TS Rookie Posts: 5,837   +6

    What do you mean by "my computer"? The "server"? What do you mean by "connected"? What do you mean by port number? How have you connected to the two switches? Two network cards? Have you set up network adapter bonding or are you just using two network interfaces with separate configurations?

    Maybe try explaining again what exactly you want to achieve, what you have done and what is wrong.
  3. dannydy

    dannydy TS Enthusiast Topic Starter Posts: 136

    maybe i should draw a diagram and explain from it.
    Here's the attached file.
  4. jobeard

    jobeard TS Ambassador Posts: 10,880   +903

    if switch#1 fails, the pc can contact the DB1 and the server but not DB2.

    you need a fully duplexed network if you wish to ensure access for any single
    network failure.

    see the attachment
  5. dannydy

    dannydy TS Enthusiast Topic Starter Posts: 136

    ok thanks so much.
    Another doubt is that, when they're working, isn;t PC1 can access to DB2?
  6. dannydy

    dannydy TS Enthusiast Topic Starter Posts: 136

    ok thanks for solving my problem.
  7. jobeard

    jobeard TS Ambassador Posts: 10,880   +903

    with the noted cross connection to both DBs to each router, then they're both accessible everywhere.
  8. jobeard

    jobeard TS Ambassador Posts: 10,880   +903

    btw: notice that those are two routers, not switches. For clarification, let's say
    router-1 has addresses like 192.168.10.x
    router-2 has addresses like 192.168.20.x

    Then each device that needs fail-save access to the DBx pair needs two NICs,
    one on the 192.168.10.x and the other on 192.168.20.x.

    DB systems will also have the same setup, connections to both 192.168.10.x and 192.168.20.x
  9. tipstir

    tipstir TS Ambassador Posts: 2,426   +112

    Are these real servers and managed switches like those you either telnet into or use the browser web admin to control? Otherwise either way if you have the switches on a stack method if one switch failes then the other ones will function. But that's not always the case with CISCO Catalyst 3750 prior 5050 series was more stable. In anycase if you just have windows 2003 server with two nics one for the wan and one for the lan connected to dual switches then if one switch failed say netgear and a linksys 8-port then one will not function without the other. Did the whole switch fail or just the ports?
  10. dannydy

    dannydy TS Enthusiast Topic Starter Posts: 136

    The main issue i concern is if the whole switch fail, not the port.
    physically, when the whole switch 1 fails, PC1 will not able access to DB2. Just want to double confirm.
  11. jobeard

    jobeard TS Ambassador Posts: 10,880   +903

    That's correct. The DUAL HOMING solution works if you remove all
    'single points of failure', meaning if one component in any path fails, there is another
    path and device to continue with.

    Notice that every device on my diagram has two connections :)
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