https://community.extremenetworks.com/t5/extremeswitching-exos-switch/hello-query-an-extrem-sw-supports-more-than-one-vlan-in-a-port/m-p/22969#M2111 It would depend on your situation. As explained above you can have more than one tagged vlan per port and only one untagged vlan, but how many devices on the vlan? More than 200-300 devices could start impacting performance depending on utilization, ,protocols, congestion, drops and other statistics you can find on the switch. I have 22 buildings (several are 3 or 4 floors) and I configure a separate vlan per floor and the device count is 50-200 devices per vlan. Mon, 24 Sep 2018 21:30:00 GMT Terry_Rauk 2018-09-24T21:30:00Z https://community.extremenetworks.com/t5/extremeswitching-exos-switch/hello-query-an-extrem-sw-supports-more-than-one-vlan-in-a-port/m-p/22965#M2107 Hello ! query ... an extrem SW supports more than one vlan in a port? Or should we eliminate the vlan to add another? Regards! Mon, 24 Sep 2018 19:42:00 GMT https://community.extremenetworks.com/t5/extremeswitching-exos-switch/hello-query-an-extrem-sw-supports-more-than-one-vlan-in-a-port/m-p/22965#M2107 Bryan_Hernadez 2018-09-24T19:42:00Z https://community.extremenetworks.com/t5/extremeswitching-exos-switch/hello-query-an-extrem-sw-supports-more-than-one-vlan-in-a-port/m-p/22966#M2108 You can multiple tagged VLANs but only 1 untagged. Mon, 24 Sep 2018 19:47:00 GMT https://community.extremenetworks.com/t5/extremeswitching-exos-switch/hello-query-an-extrem-sw-supports-more-than-one-vlan-in-a-port/m-p/22966#M2108 davidj_cogliane 2018-09-24T19:47:00Z https://community.extremenetworks.com/t5/extremeswitching-exos-switch/hello-query-an-extrem-sw-supports-more-than-one-vlan-in-a-port/m-p/22967#M2109 Hello Bryan,<BR /> <BR /> You can absolutely have more than one (tagged) vlan per port, there is no need to remove any existing vlans.<BR /> <BR /> This article from our KB explains how tagged and untagged vlans work in EXOS:<BR /> <BR /> <A href="https://gtacknowledge.extremenetworks.com/articles/How_To/Understanding-EXOS-VLANS-and-tagged-and-untagged-ports" target="_blank" rel="nofollow noreferrer noopener">https://gtacknowledge.extremenetworks.com/articles/How_To/Understanding-EXOS-VLANS-and-tagged-and-un...</A><BR /> <BR /> Thanks,<BR /> <BR /> Ash <BR /> Mon, 24 Sep 2018 20:13:00 GMT https://community.extremenetworks.com/t5/extremeswitching-exos-switch/hello-query-an-extrem-sw-supports-more-than-one-vlan-in-a-port/m-p/22967#M2109 Ash_Curtis 2018-09-24T20:13:00Z https://community.extremenetworks.com/t5/extremeswitching-exos-switch/hello-query-an-extrem-sw-supports-more-than-one-vlan-in-a-port/m-p/22968#M2110 thanks You !  Mon, 24 Sep 2018 20:13:00 GMT https://community.extremenetworks.com/t5/extremeswitching-exos-switch/hello-query-an-extrem-sw-supports-more-than-one-vlan-in-a-port/m-p/22968#M2110 Bryan_Hernadez 2018-09-24T20:13:00Z https://community.extremenetworks.com/t5/extremeswitching-exos-switch/hello-query-an-extrem-sw-supports-more-than-one-vlan-in-a-port/m-p/22969#M2111 It would depend on your situation. As explained above you can have more than one tagged vlan per port and only one untagged vlan, but how many devices on the vlan? More than 200-300 devices could start impacting performance depending on utilization, ,protocols, congestion, drops and other statistics you can find on the switch. I have 22 buildings (several are 3 or 4 floors) and I configure a separate vlan per floor and the device count is 50-200 devices per vlan. Mon, 24 Sep 2018 21:30:00 GMT https://community.extremenetworks.com/t5/extremeswitching-exos-switch/hello-query-an-extrem-sw-supports-more-than-one-vlan-in-a-port/m-p/22969#M2111 Terry_Rauk 2018-09-24T21:30:00Z