Dell PowerEdge M520 Dell Converged Enhanced Ethernet Administrator's Guide - Page 50
Ingress VLAN filtering, Port VLAN membership is con d through the CEE CLI.
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5 Ingress VLAN filtering • Admit VLAN tagged and untagged frames-All tagged and untagged frames would be processed as follows: - All untagged frames are classified into native VLANs. - All frames egressing are untagged for the native VLANs. - Any tagged frames coming with a VLAN tag equal to the configured native VLAN are processed. - For ingress and egress, non-native VLAN tagged frames are processed according to the allowed VLAN user specifications. This is called converged mode. NOTE Ingress VLAN filtering is enabled by default on all Layer 2 interfaces. This ensures that VLANs are filtered on the incoming port (depending on the user configuration). Figure 3 displays the frame processing logic for an incoming frame. FIGURE 3 Ingress VLAN filtering Incoming frame on an interface Is the port Yes Is the VLAN ID No a trunk? an allowed VLAN? Drop frame No Yes No Is the port an access interface? Drop frame Yes Assign the frame to the VLAN present in the VLAN ID field of the Ethernet header Does the frame match any of the configured VLAN classifiers No (MAC address based and protocol based)? Yes Assign the frame to the classified VLAN Assign the frame to the configured PVID There are important facts you should know about Ingress VLAN filtering: • Ingress VLAN filtering is based on port VLAN membership. • Port VLAN membership is configured through the CEE CLI. • Dynamic VLAN registration is not supported. • The Dell FCoE hardware does VLAN filtering at both the ingress and egress ports. • The VLAN filtering behavior on logical Layer 2 interfaces such as LAG interfaces is the same as on port interfaces. • The VLAN filtering database (FDB) determines the forwarding of an incoming frame. 32 Dell Converged Enhanced Ethernet Administrator's Guide 53-1002116-01