04-25-2017 04:11 AM
Two VDXs (in fabric) with two ICXs iterconnected over LAGs (schema is attached). R/STP is turned off everywhere.
Am I right in understanding that interconnecting VDXB with ICXB over orange line will create a loop? What is going to happen with the orange LAG then? Will it be shut down as long as the LAG between ICXA and ICXB is up?
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04-26-2017 03:55 AM
Assuming that the same VLAN(s) are configured on all of the interfaces then the diagram you have included would indeed result in a layer 2 loop.
It is most likely that all LAGs will be formed OK and that loop will be created without any loop prevention mechanism.
So a loop prevention mechanism (STP, RTSP etc.) would be required to ensure that a loop free topology was formed
05-11-2017 09:51 AM
Assuming VDXa and VDXb are in the same core location, I would recomend you remove the LAG between ICXa and ICXb and change the LAG from the ICX to VDX switches to be LACP MLAGs (multi-chassis) between both VDX switches.
Thats what we do in our datacenter and allows the network to survive a core VDX switch failure or software upgrade. I have attached an example from my docs.