[c-nsp] Handling redundancy between buildings.

[Scott Voll]

run your 3750's in a HSRP setup.  weight the one in the building to be
primary for the vlan's in that building and do the oppisite in the other
building.

we do it here and it works pretty slick.

Not knowing the size of your buildings.... it is possible to run out of
HSRP instances.  I think we topped our 3750E off at 32.

Not sure what your looking at for total vlans.

YMMV

Scott

On Mon, Apr 30, 2012 at 12:08 PM, Kevin Seich <kseich at gmail.com> wrote:

> We have 2 buildings on our Campus right next to each other.  They are
> connected by 10 Gb fiber pulls.  Each building has it's own generator and
> UPS.  Each building has it's own ISP.  We have an ASA 5520 failover pair,
> one in each building.  We have 2 - 3750x stacked in each building as a
> core.  We are currently a flat network, a /16.  We are in the
> design/brainstorming phase of segmenting this into vlans.  We'd like to
> take the burden off the ASA for routing and do all inter vlan routing on
> the 3750s.  From what we can see, you cannot treat the 3750s as a failover
> pair, like the ASAs.  What are our options in segmenting this?
>
> 1  We can do all routing on the ASAs.  This would achieve the same
> redundancy we have now, but put the burden on the ASA for routing all
> vlans.
>
> 2  Put the routing on the 3750 stack.  This would essentially break our 2
> buildings into separate networks, separate , non-overlapping vlans in each
> building.  reconfigure services to talk across the buildings and vlans.
>
> 3  put in routers behind the ASAs that handle all the vlan routing.  These
> function in a failover pair.  this keeps the redundancy we are looking for
> but we are not utilizing the layer 3 capability that we paid for on the
> 3750s.
>
> Are there other options?  What have you guys/girls done?
>
> Looking for any other input you have just to spark the design creativity.
>
> Thank you !
> Kevin
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