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I have a main and several satellite site's.

Between the main and the satellite site's, there are 2 physical links.

all site's have 2 layer-3 switches that are capable of

  • dt-LACP (an LACP trunk, connected to the 2 layer3-switches)
  • ospf

These switches are not in a switch-stack in the Cisco/3Com way (configurable as one switch), but are separate switches with a Switch-Interconnect. Router redundancy is achieved using VRRP.

Should I connect the sites with

  • a dt-LACP LAG
  • create a OSPF network between all 4 Layer-3 switches

http://thomasr.home.xs4all.nl/netwerk-ontwerp.jpg

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    LACP is link aggregation. OSPF is a routing protocol. I'm confused on your question. – TheCleaner Feb 3 '15 at 15:33
  • What switch manufacturer/model are you using? – ewwhite Feb 3 '15 at 15:35
  • I've got HP Procurve 3500's and Dell Force 10 S4820T's (one type in each pair :-) – Thomas Roes Feb 3 '15 at 16:05
  • @ewwhite: I know LACP and OSPF are very different technologies, but I think I can make two very different solutions to the same problem. - Will each work - what would be the better solution, and why? LACP seems to be the simpeler solution. – Thomas Roes Feb 3 '15 at 16:06
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dt-LACP seems to be HPs Distributed Trunking. According to an answer at the HP Support Center, Distributed Trunking is only meant for server-to-switch-connections, not switch-to-switch.

Considering that your four switches are non-stacked (at least in my terminology), standard L3 routed links with OSPF for dynamic routing would be my choice.

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