Dell Force10 E1200i FTOS Version 8.4.1.5 Configuration Guide for ExaScale - Page 1016
Port-based VLANs, VLAN Tagging, VLAN Membership, 1Q VLAN Tag
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www.dell.com | support.dell.com Port-based VLANs On FTOS, a VLAN is a user-defined group of ports (there is also the concept of protocol-based VLANs). Ports in different VLANs do not communicate unless routing is configured between them. A port may belong to more than one VLAN. Typically, ports connected to a host belong to only one VLAN, and ports on an inter-switch link belong to more than one VLAN; these ports are sometimes called trunk ports. Figure 58-1. VLAN Membership Ports of an inter-switch link typically belong to multiple VLANs VLAN 100 VLAN 200 Ports connected to end-stations typically belong to a single VLAN VLAN Tagging Since a port may belong to more than one VLAN, the switch must be able to identify the VLAN two which a broadcast frame belongs. For this case, IEEE 802.1Q defines a method of marking frames to indicate the VLAN on which the frame originated. The marker, called a VLAN tag, is 4 bytes and is inserted after the source MAC in the Ethernet frame header, as shown in Figure 58-2. The tag is preserved as the frame moves through the network so that intermediate switches can forward the frame appropriately. Figure 58-2. 802.1Q VLAN Tag Preamble Destination Address Source Address Tag Header Ether Type Data Frame Check Sequence TPID Priority CFI VLAN ID (0x8100) (0-7) (0 or 1) (0-4095) Signals that 802.1Q information will follow Cannonical Form Indicator Ports that belong to more than one VLAN insert VLAN tags into frames and so they are called tagged ports. Ports that belong to a single VLAN, do not insert VLAN tags into frames and are called untagged ports. When you add a port to a VLAN, you must specify whether the port should be tagged or untagged. 1016 | VLAN
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