redundant switches spanning-tree question

Discussion in 'Cisco' started by lfnetworking, May 16, 2005.

  1. lfnetworking

    lfnetworking Guest

    have a 3548 and a 3550 each cross-connected and trunking to two 7206s.
    Looking at spanning-tree info on the two switches, they both declare
    themselves root bridge for the same vlans. spanning-tree isn't enabled
    on the routers. up to this point there aren't any redundant vlans across
    the two switches, which is why i'm guessing there have been no issues.
    now, however, i'm tasked with setting up redundant connections from a
    pix failover pair, one to each switch. hsrp will be configured on
    router subinterfaces for their vlan.

    since at the moment the switches aren't passing bpdus to each other is
    there a way to configure the routers to forward this info and in general
    how will i go about avoiding bridge loops in this scenario

    thanks
    lfnetworking, May 16, 2005
    #1
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  2. lfnetworking

    lfnetworking Guest

    I assume only the switches can be elected root, so, would simply
    trunking the switches be sufficient to eliminate all bridge loops?

    lfnetworking wrote:
    > have a 3548 and a 3550 each cross-connected and trunking to two 7206s.
    > Looking at spanning-tree info on the two switches, they both declare
    > themselves root bridge for the same vlans. spanning-tree isn't enabled
    > on the routers. up to this point there aren't any redundant vlans across
    > the two switches, which is why i'm guessing there have been no issues.
    > now, however, i'm tasked with setting up redundant connections from a
    > pix failover pair, one to each switch. hsrp will be configured on
    > router subinterfaces for their vlan.
    >
    > since at the moment the switches aren't passing bpdus to each other is
    > there a way to configure the routers to forward this info and in general
    > how will i go about avoiding bridge loops in this scenario
    >
    > thanks
    lfnetworking, May 16, 2005
    #2
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  3. lfnetworking

    Scooby Guest

    "lfnetworking" <> wrote in message
    news:CUThe.251$...
    > have a 3548 and a 3550 each cross-connected and trunking to two 7206s.
    > Looking at spanning-tree info on the two switches, they both declare
    > themselves root bridge for the same vlans. spanning-tree isn't enabled
    > on the routers. up to this point there aren't any redundant vlans across
    > the two switches, which is why i'm guessing there have been no issues.
    > now, however, i'm tasked with setting up redundant connections from a
    > pix failover pair, one to each switch. hsrp will be configured on
    > router subinterfaces for their vlan.
    >
    > since at the moment the switches aren't passing bpdus to each other is
    > there a way to configure the routers to forward this info and in general
    > how will i go about avoiding bridge loops in this scenario
    >
    > thanks


    Try forcing one to root by setting the priority.
    Scooby, May 16, 2005
    #3
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