True physical stacking supports up to 6 units and 40gbps bi directional bandwidth for high scalability and efficient redundancy 10g sfp ports for stacking andor uplink providing support for high bandwidth applications for congestion relief and smooth data delivery l2 feature static routing help route internal traffic for more efficient use of network resources advanced security features include ip mac port binding acl port security dos defend storm control dhcp snooping 8021x and radius authenti