Cisco SGE2000 Software Configuration Guide - Page 18
Forwarding Model
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Forwarding Model Overview Forwarding Model The Cisco Nexus 2000 Series Fabric Extender does not perform any local switching. All traffic is sent to the parent switch that provides central forwarding and policy enforcement, including host-to-host communications between two systems that are connected to the same Fabric Extender as shown in the following figure. Figure 1: Forwarding Model The forwarding model facilitates feature consistency between the Fabric Extender and its parent Cisco Nexus Series device. Note The Fabric Extender provides end-host connectivity into the network fabric. As a result, BPDU Guard is enabled on all its host interfaces. If you connect a bridge or switch to a host interface, that interface is placed in an error-disabled state when a BPDU is received. You cannot disable BPDU Guard on the host interfaces of the Fabric Extender. The Fabric Extender supports egress multicast replication from the network to the host. Packets sent from the parent switch for multicast addresses attached to the Fabric Extender are replicated by the Fabric Extender ASICs and are then sent to corresponding hosts. Cisco Nexus 2000 Series NX-OS Fabric Extender Software Configuration Guide 8 OL-25816-02