https://community.extremenetworks.com/t5/extremeswitching-exos-switch/mlag-ports-with-a-untagged-vlan-loop/m-p/29709#M4915 Hi Ian,<BR /> <BR /> MLAG would avoid the loop in the VLANs by constantly checkpointing the FDB entries between the peers. ISC blocking mechanism is independent of whether the VLAN is tagged or untagged. <BR /> So, ideally there should not be a loop if you have a VLAN untagged in the MLAG ports. <BR /> Hope this helps! Mon, 19 Oct 2015 15:24:00 GMT Prashanth_KG 2015-10-19T15:24:00Z https://community.extremenetworks.com/t5/extremeswitching-exos-switch/mlag-ports-with-a-untagged-vlan-loop/m-p/29708#M4914 Hi,<BR /> <BR /> Just would like to understand if you have an un-tagged vlan for example vlan default on your mlag ports on both switches will this create a loop."Yes vlan default is also on the ISC port between the switchs"<BR /> <BR /> Would this be like joying to access ports together?<BR /> <BR /> I understand when it comes to tagged vlans within MLAG, but i was just worried about unttaged vlan's. In a normal case you would not have an unattged vlan but i am asking what if.<BR /> <BR /> Regards<BR /> Ian <BR /> Mon, 19 Oct 2015 15:17:00 GMT https://community.extremenetworks.com/t5/extremeswitching-exos-switch/mlag-ports-with-a-untagged-vlan-loop/m-p/29708#M4914 Ian_Worms 2015-10-19T15:17:00Z https://community.extremenetworks.com/t5/extremeswitching-exos-switch/mlag-ports-with-a-untagged-vlan-loop/m-p/29709#M4915 Hi Ian,<BR /> <BR /> MLAG would avoid the loop in the VLANs by constantly checkpointing the FDB entries between the peers. ISC blocking mechanism is independent of whether the VLAN is tagged or untagged. <BR /> So, ideally there should not be a loop if you have a VLAN untagged in the MLAG ports. <BR /> Hope this helps! Mon, 19 Oct 2015 15:24:00 GMT https://community.extremenetworks.com/t5/extremeswitching-exos-switch/mlag-ports-with-a-untagged-vlan-loop/m-p/29709#M4915 Prashanth_KG 2015-10-19T15:24:00Z