If you are configuring two SSA chassis for virtual switch bonding, we strongly recommend that you create a minimum of two VSB interconnections. VSB interconnect ports should be selected taking into consideration the optimization of bandwidth usage and redundancy.
For example, you could connect uplink ports 1 and 2 on SSA chassis 1 to uplink ports 1 and 2 on SSA chassis 2. See the S-, K-, and 7100 Series Configuration Guide for details about how to configure virtual switch bonding.