https://community.extremenetworks.com/t5/extremeswitching-exos-switch/mlag-isc-passing-through-core-switch/m-p/47526#M12247 Hello,<BR /> I have to to create an MLAG on two switches for a server but there are no free ports available for ISC. <BR /> Is it possible to use the uplink ports connected to core switch for ISC vlan tagging ? Or is it necessary to have a dedicated ISC link between the 2 switches with only one ISC vlan tagged on it. <BR /> I searched the documents but couldn't find anything for or against what I am trying to configure here. Wed, 22 Nov 2017 19:49:00 GMT f3rha4n 2017-11-22T19:49:00Z https://community.extremenetworks.com/t5/extremeswitching-exos-switch/mlag-isc-passing-through-core-switch/m-p/47526#M12247 Hello,<BR /> I have to to create an MLAG on two switches for a server but there are no free ports available for ISC. <BR /> Is it possible to use the uplink ports connected to core switch for ISC vlan tagging ? Or is it necessary to have a dedicated ISC link between the 2 switches with only one ISC vlan tagged on it. <BR /> I searched the documents but couldn't find anything for or against what I am trying to configure here. Wed, 22 Nov 2017 19:49:00 GMT https://community.extremenetworks.com/t5/extremeswitching-exos-switch/mlag-isc-passing-through-core-switch/m-p/47526#M12247 f3rha4n 2017-11-22T19:49:00Z https://community.extremenetworks.com/t5/extremeswitching-exos-switch/mlag-isc-passing-through-core-switch/m-p/47527#M12248 Hi,<BR /> <BR /> you need a direct connection between the two MLAG peers. That link is used for ISC vlan and data vlans as well (for redundancy).<BR /> Wed, 22 Nov 2017 21:37:00 GMT https://community.extremenetworks.com/t5/extremeswitching-exos-switch/mlag-isc-passing-through-core-switch/m-p/47527#M12248 Stephane_Grosj1 2017-11-22T21:37:00Z