Hi,  That may be true " It could also be that WS-C3850-12XS-S is not stack-able with other models but not documented." Regards/Surjeet ... View more

Hi, Yes, Both are in install mode and having same IOS version code. Do you think, issue can be to enable stack Ports on both the switches to get the stack connection up ? I have enable the stack port on one switch, but will try to enable the stack port at other switch. Regards, Surjeet ... View more

Hi, I have tried with that also but the main problem is that their stack ports are not coming up. second thing i have tried by replacing the cable as but no luck. also just to update you the this issue is with two pair of stack switch so i don't think both pair have port issue. here is the output of stack port : SW01#sh switch stack-ports summary Sw#/Port# Port Status Neighbor Cable Length Link OK Link Active Sync OK #Changes to LinkOK In Loopback ------------------------------------------------------------------------------------------------------------------- 1/1 DOWN NONE No cable No No Yes 0 Yes 1/2 DOWN NONE No cable No No Yes 0 Yes Config :  SW01#sh run | in pro switch 1 provision ws-c3850-12xs switch 2 provision ws-c3850-48p SW01#sh ver | in 3850 Model Number :  * 1 16 WS-C3850-12XS 03.07.03E cat3k_caa-universalk9 INSTALL ... View more

Hi, Yes, They both have same IOS and license.  Do you have any idea why stack ports remain down/down on both the switch ? Also do have document and real exam that we can make stack for these two different model switches ? Regards, Surjeet ... View more