Are XISLs logical or real cables with different type of SFP?
I am so confused about the domain ID (DID). I understand all default switches (DS) must have a unique DID in order to form a link with another.
However, how about the logical switches (LS)
--->>>Are XISLs logical or real cables with different type of SFP?
neither the one nor the other.
XISL is a Feature configurable in the FOS, and not related to cabling or SFP
YES, each/all DS / LS Switches must have a unique DID
If you want to configure Routing, must also be consider FID
for more details refer the FOS Admin guide