hot standby with 2 ethernet on 3725 router

Discussion in 'Cisco' started by Paul Hardy, Jun 6, 2004.

  1. Paul Hardy

    Paul Hardy Guest

    I have a 3725 that we use for our serial wan links, I would like to give it
    some reduncy on its connection to the lan via the ethernet.
    It has a spare fastethernet I could use but I dont know ho to use this.

    can I somehow give it the same ip and setup as the first interface and it
    only comes active when the first fails ?

    thanks in advance
    Paul Hardy, Jun 6, 2004
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  2. Paul Hardy

    nobody Guest

    You could use the backup command.

    int F0/0
    ip addr
    backup int F0/1
    int F0/1
    ip addr

    This would put F0/1 in what is essentialy admin down, until F0/0 goes

    Another option is a BVI interface.

    bridge 1 protocol ieee
    int F0/0
    bridge-group 1
    int F0/1
    bridge-group 1
    int BVI 1
    ip address

    Just make sure both are connected to a switch that does spanning tree.

    nobody, Jun 6, 2004
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  3. Pedro Gil Morales, Jun 6, 2004
  4. Paul Hardy

    Ivan Ostres Guest

    I really do not understand why do you think that you need a Catalyst
    switch to use HSRP? It should work using any switch or hub.

    Ivan Ostres, Jun 6, 2004
  5. Paul Hardy

    Hansang Bae Guest

    That's the problem with using Ethernet ports in backup mode. How often
    does the Ethernet port go up/down or down/down? Not too often.

    This is a kludge. Don't use BVI since if you do, performance numbers
    can go down.

    If you want redundancy (though in this case, the WAN link is going to be
    your #1 guy to worry about), you can use multiple /30 point to point
    ethernet configurations and letting routing decide the best route.



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    Hansang Bae, Jun 7, 2004
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