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Virtual Connect - Mapping vs Tunnelling?!

Frequent Advisor

Virtual Connect - Mapping vs Tunnelling?!


We have come across a bit of an open question...

With VC on a c7000 for ESX... do we map VLAN's or tunnel...

Just wondered what people's thoughts were and why?
Honored Contributor

Re: Virtual Connect - Mapping vs Tunnelling?!

Tunneling is easier to configure in VC. For Tunneling you don't need to explicitly configure the VLANs needed on your ESX boxes. Basically just dot1q tag the external switches and use port groups on your ESX vswitches.

Mapping gives you more granular control over what VLANs go where. Maybe your dot1q trunk coming in to VC has 10 vlans on it but on one of your VC downlink ports you only want 3 VLANs reaching that ESX NIC and for another VC downlink you want a different 3 VLANs. Mapping allows you to do this but Tunneling will not.

If you have a very large number of VLANs you have to use Tunneling because there is a limitation to the number of mapped vlans you can have, I think its around 32 VLANs.

If you have a small number of VLANs I think it is better to use Shared Uplink Sets and Mapped VLANs.