[c-nsp] Cluster 2 stacks?

[Eric Kagan]

> 
> I've currently got a stack of 3750G's that do the majority of 
> the switching and static IP routing for our network.  We're 
> building out a new network in a nearby building and plan to 
> connect the facilities with underground fiber.  I'd like to 
> install a second stack of 3750G's in the new building and 
> connect the two stacks via GBIC.  So far, so good.  I'd also 
> like to have the following abilities:
> 
> 1.  Layer 2 connectivity between the two buildings, so a 
> single IP address within a subnet directly connected to the 
> switches in building 1 can be picked up and moved to building 
> 2 and plugged into the switch stack and begin working once 
> ARP tables update.  This part is pretty straightforward.
> 
> 2.  I'd like to have the two stacks act as one logical switch 
> for IP routing purposes so that layer 3 traffic doesn't 
> necessarily have to go between buildings if not absolutely necessary.
> 
> It seems to me that I could accomplish all this by clustering 
> the two stacks of 3750's, but I'm not sure if that's 
> possible.  I can find documentation on stacking and on 
> clustering, but nothing about clustering multiple stacks.  It 
> seems feasible, but...  And, assuming it's possible, will it 
> accomplish what I'm looking to do?  Basically one big logical 
> switch that happens to have half it's ports on either end of 
> some GBICs?
> 
> Thanks,
> 

You should be able to make the 2 fiber connecting ports "trunk" ports and
then VLAN's will pass across (default VLAN1, etc) maintaining L2.  We do
this with 3524XL's

Eric