Capacity planning for interchassis links is an important part of VSS deployment. Include capacity for FWSM failover pairs to account for failover/state VLAN links between the two chassis if FWSM interchassis failover is deployed. It is recommended to set aside 1-2Gbps for this purpose.
Now, I'm using two 10Gb interface for VSL.
May I use two 1Gb interface, always on SUP720 to build a dedicated GEC for failover pairs only?