Dell Force10 MXL Blade MXL 10/40GbE Switch IO Module Configuration Guide - Page 627
Port-Based VLANs, VLANs and Port Tagging, Tagged Frame Format
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Untagged interfaces must be part of a VLAN. To remove an untagged interface from the default VLAN, you must create another VLAN and place the interface into that VLAN. Alternatively, use the no switchport command, and FTOS removes the interface from the default VLAN. A tagged interface requires an additional step to remove it from Layer 2 mode. Because tagged interfaces can belong to multiple VLANs, you must remove the tagged interface from all VLANs using the no tagged interface command. Only after the interface is untagged to the default vlan can you use the no switchport command to remove the interface from Layer 2 mode. For more information, refer to VLANs and Port Tagging. Port-Based VLANs Port-based VLANs are a broadcast domain defined by different ports or interfaces. In FTOS, a port-based VLAN can contain interfaces from different stack units within the chassis. FTOS supports 4094 port-based VLANs. Port-based VLANs offer increased security for traffic, conserve bandwidth, and allow switch segmentation. Interfaces in different VLANs do not communicate with each other, adding some security to the traffic on those interfaces. Different VLANs can communicate between each other by means of IP routing. Because traffic is only broadcast or flooded to the interfaces within a VLAN, the VLAN conserves bandwidth. Finally, you can have multiple VLANs configured on one switch, thus segmenting the device. Interfaces within a port-based VLAN must be in Layer 2 mode and can be tagged or untagged in the VLAN ID. VLANs and Port Tagging To add an interface to a VLAN, it must be in Layer 2 mode. After you place an interface in Layer 2 mode, it is automatically placed in the default VLAN. FTOS supports IEEE 802.1Q tagging at the interface level to filter traffic. When you enable tagging, a tag header is added to the frame after the destination and source MAC addresses. That information is preserved as the frame moves through the network. Figure 37-2 shows the structure of a frame with a tag header. The VLAN ID is inserted in the tag header. Figure 37-2. Tagged Frame Format Ethernet Preamble Destination Address Source Address 6 octets 6 octets Tag Protocol Header Type Data 4 octets 2 octets 45 - 1500 octets Frame Check Sequence 4 octets FN00001B Virtual LANs (VLAN) | 625
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