HP StorageWorks 1606 Brocade Converged Enhanced Ethernet Administrator's Guide - Page 58
Ingress VLAN filtering,
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4 Ingress VLAN filtering • Admit VLAN tagged and untagged frames-The untagged frames are classified into native VLANs. Any tagged frames coming with a VLAN tag equal to the configured native VLAN are dropped. 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 10 shows the frame processing logic for an incoming frame. FIGURE 10 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 Brocade 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. Additionally, there are important facts you should know about the VLAN FDB: • The VLAN FDB contains information that helps determine the forwarding of an arriving frame based on MAC address and VLAN ID data. The FDB contains both statically configured data and dynamic data that is learned by the switch. • The dynamic updating of FDB entries using learning is supported (if the port state permits). 38 Converged Enhanced Ethernet Administrator's Guide 53-1001346-01