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Ethernet Fabric (VDX, CNA)

Posts: 29
Registered: ‎12-02-2015
Accepted Solution

Interconnecting VDX with ICX (possible loop)?



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?


Thank you.

Former Brocadian
Posts: 238
Registered: ‎06-30-2010

Re: Interconnecting VDX with ICX (possible loop)?



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




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Occasional Contributor
Posts: 8
Registered: ‎07-02-2012

Re: Interconnecting VDX with ICX (possible loop)?

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.

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