Hello LOSTforce10,   In the running configuration we can see  2 units of S4048 and they are in a stack: stack-unit 1 provision S4048-ON stack-unit 2 provision S4048-ON stack-unit 1 stack-group 1 stack-unit 1 stack-group 12 The ports that are used for stacking are stack-group 1 and stack-group 12. According to this user guide page 908 stack-group 1 is ports 5,6,7,8 and stack-group 12 is port 49. When the ports are used for stacking, they do not show as normal data ports.   [URL]    
I have two stacked S4048 switches.  When the command show ip interface brief is issued ports Te1/5-8 are missing. Interface IP-Address OK Method Status ProtocolTenGigabitEthernet 1/1 unassigned NO Manual up downTenGigabitEthernet 1/2 unassigned NO Manual up downTenGigabitEthernet 1/3 unassigned NO Manual up downTenGigabitEthernet 1/4 unassigned NO Manual up downTenGigabitEthernet 1/9 unassigned NO Manual administratively down downTenGigabitEthernet 1/10 unassigned NO Manual up down   (conf)#int te1/5^% Error: Value out of range at "^" marker.   I have rebooted the device, no change.   Has anyone had this issue before?   Thanks!  
S4048 interfaces not displaying