Physical redundancy (CSS connected on two different switches)

Hello,
Is it possible for redundancy reasons to connect a CSS to two different switches (like we do for access switches) ?
I know that one option is to configure both interfaces in the same vlan and use the spanning-tree for the redundancy. However, this will not be transparent for the end-user due to the slow convergence of the spanning-tree (uplinkfast or rapid-pvst is probably not supported).
Are there any other options ? One interface active, the other backup ?
Thanks in advance for your reply.
Gaetan

Gaetan,
for the CSS we suggest to be connected to only 1 switch and if the CSS detect a failure with the switch, force failover to the redundant css.
If you have ASR configured, failover will be stateful.
Gilles.

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