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fubarSUSHI's avatar
fubarSUSHI
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Apr 22, 2014

Design question - LTMs in DC1 and resources in DC2

I have a design question in regards of setting up a LTM pair in DC1 with, lets say vlan100 (172.16.100.x/24) but the application and application resources are remote in a different DC with vlan200 (1...
application delivery
design
LTM
Cory_50405's avatar
Cory_50405
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Apr 22, 2014

This is not an uncommon setup. We have LTMs in a data center that have pool members that reside elsewhere across a WAN. Our virtual servers use address space out of the local vlan (vlan 100 in your case) and the pool members (real servers) use whatever IP address they are assigned. Vlan number isn't significant in this case since the communications will be routed from the LTM to wherever the destination is, so vlan won't even be a consideration for the LTM from the server perspective.

 

You'll only need to ensure that you have an appropriate route defined to get to the pool members and it should work without issue.

 

  • fubarSUSHI's avatar
    fubarSUSHI
    Icon for Altocumulus rankAltocumulus
    Apr 23, 2014
    Cool. So in your opinion, do you think a standard any/any default route should suffice as long as I point it back up to the uplink layer3 interface or should I make a route with a little bit more specific information? Like adding a specific subnet route up to the layer3 svi and creating a standard default route?
  • Cory_50405's avatar
    Cory_50405
    Icon for Noctilucent rankNoctilucent
    Apr 23, 2014
    If you already have a default route on the LTM that will work, then there's no need to add another. Just add long as that layer three device upstream can route to the pool members. I tend to just set one default route and let everything follow that. I realize this is very environment dependent though.