Setup is like below: -
Two Core Layer 3 switches A & B. Two Access Layer 2 switches C & D.
Each access switch C & D has two individual links connecting to two core switches for redundancy.
A & B are running HSRP in a way that A is HSRP Active for VLAN 10 and B is HSRP Active for VLAN 50. Also A is STP Root for VLAN 10 and B is STP Root for VLAN 50.
My question is: - In my Setup, do I need to have a dedicated link between the two Core switches??
And if I don't have the dedicated link, then what could be the implications in any kind of failure scenario.