I am not exactly sure what you mean by this question since both the DLR and ESG are virtual to start with. So it is impossible to cross-connect these devices using a cross-over cable like you would with a physical router and firewall. I think you can either use the NSX virtual switch to connect the DLR and ESG or you may be able to use a Distributed Switch. In my case, I am using the NSX virtual switch.
Richard
Thanks Richard
I'm sorry I made it confused for you to understand, I think you already give me the answer
I meant to say that 'why we must select a port group(Logic Switch is also a port group, right?) as a interface of ESG, but not a DLR as interfaces of ESG'