[c-nsp] Content filters configured as transparent bridges and spanning tree

[Christopher J. Wargaski]

Steven--

   How about increasing the STP cost of the switch ports connecting to the
secondary content filter? That should force STP to prefer the primary.

cjw


Date: Fri, 24 Jun 2011 10:58:50 -0400
> From: "Steven Pfister" <SPfister at dps.k12.oh.us>
> To: <cisco-nsp at puck.nether.net>
> Subject: [c-nsp] Content filters configured as transparent bridges and
>        spanning tree
> Message-ID: <4E046DEA.9E6F.00B8.1 at dps.k12.oh.us>
> Content-Type: text/plain; charset=US-ASCII
>
> I've got a situation where I need to connect two switches, a 4507R (our
> core switch) to a 3560, using two devices which are functioning as
> transparent bridges, connected in parallel. The devices are actually
> content filters (they're Lightspeed Rocket appliances if that makes any
> difference), and we'd like to have one online as a standby unit in case
> the first one fails. The only other thing connected to the 3560 is two
> PIX firewalls (active/standby) which are in a vlan from the core
> network. The two switch are EIGRP neighbors.
>
> I was hoping that spanning-tree would take care of selecting one device
> for production use and the other as a standby. When we tried it, there
> was no connectivity at all. It seemed like the switches were not
> agreeing on which device to use. Is there any way to maybe have the
> 4507R take care of the forwarding/blocking decisions and turn off
> spanning-tree on the 3560?
>
>
> Steve Pfister
> Network Engineer
> Office of Information Technology
> Dayton Public Schools
> 115 S Ludlow St
> Dayton, OH 45402-1812
> Phone: 937-542-3149
> Cell: 937-673-6779
> spfister at dps.k12.oh.us ( mailto:spfister at dps.k12.oh.us )
>
>
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