XB8 not working with ethernet switch
I have an issue where signal is not getting passed from our Xfinity router (XB7 or XB8) to the switch which connects to other devices. We were using the Xb7 router with a D-Link 1000Mbs 24 port switch. Been using the switch for 5 years. Seems like every few years something on the Xfinity router changes and causes us to lose internet connections across the switch. We upgraded to the XB8 and same issue - no internet through the switch.
We have cycled the switch - multiple times.
Checked that all ports work correctly on switch.
Ran cable continuity checks between router and switch and switch to all downstream devices. All good.
XB8 is NOT in Bridge mode.
All four ports on the XB8 work
What could be causing this problem?