https://community.extremenetworks.com/t5/extremeswitching-exos-switch/help-for-stpd-config/m-p/22185#M1797 Hi,<BR /> <BR /> you need to have one untagged VLAN on the port.<BR /> <BR /> Erik Mon, 10 Apr 2017 22:32:00 GMT Erik_Auerswald 2017-04-10T22:32:00Z https://community.extremenetworks.com/t5/extremeswitching-exos-switch/help-for-stpd-config/m-p/22184#M1796 what is my mistake<BR /> * Slot-1 Stack.3 # configure stpd "s0" add "vlan100" ports 1:1-6<BR /> Error: Cannot assign vlan vlan100 port 1:1 to STP domain<BR /> Error: Cannot assign vlan vlan100 port 1:2 to STP domain <BR /> Error: Cannot assign vlan vlan100 port 1:3 to STP domain <BR /> Error: Cannot assign vlan vlan100 port 1:4 to STP domain<BR /> Error: Cannot assign vlan vlan100 port 1:5 to STP domain Mon, 10 Apr 2017 21:23:00 GMT https://community.extremenetworks.com/t5/extremeswitching-exos-switch/help-for-stpd-config/m-p/22184#M1796 ahmed_Ahmed 2017-04-10T21:23:00Z https://community.extremenetworks.com/t5/extremeswitching-exos-switch/help-for-stpd-config/m-p/22185#M1797 Hi,<BR /> <BR /> you need to have one untagged VLAN on the port.<BR /> <BR /> Erik Mon, 10 Apr 2017 22:32:00 GMT https://community.extremenetworks.com/t5/extremeswitching-exos-switch/help-for-stpd-config/m-p/22185#M1797 Erik_Auerswald 2017-04-10T22:32:00Z