OK, Back on Track !
The the BD's are Transit, and the blocking it done on the edge (Master)
Therefor no blocking will take place between the BD's, which are also the routers.
Thanks again for your help
If the secondary port is on the master then the answer is no as it will block the ISC port for those VLANS. If the secondary port is on a transit node then it wont matter as the secondary port will not be blocked. The Master is the only one that blocks.
I would recommend creating a LAG group between two modules and using that LAG for your ISC and EAPS link ( as long as it is not the secondary port of the master). You do not want the ISC link to go down or be blocked unless of course one of the nodes goes down.
OK Guy's . Thanks for all the comments, but I'm starting to get mixed messages.
Can I configure EAPS and MLAG using the same phy ports for the ISC and the Sec EAPS Port ?