I have a very small thing to ask i.e
I have a 6513 with redundant SUP-720s.
The question is that
1 )can we access both the SUP console simultaneously?
2) if not, then how can we switch console from primary to redundant while primary being functional as the sec. sup is locked when the primary is functional.
You cannot "access" the redundant console but it is locked and you cannot execute any commands on that console.
As for your second question, You can make the redundant as the "active" sup and then you will be able to access the console. You can issue a command "redundancy force-switchover" on the active. This will reload the active and the redundant will become active.
For what purpose do you need to access the redundant console? There is no need to do that as any configuration can be made on the active, and it is synced to the redundant. You can also access the physical resources os the redundant (eg flash etc) using slave prefix (eg. dir slavedisk0: / slaveboot-flash, slavesup-bootdisk: )
(pls rate if post helps)