User Manual UMN:CLIV5808265To configure subnet-based VLAN, use the following command.Command Mode Descriptionvlan subnet A.B.C.D/M VLANSBridge Configures subnet based VLAN.VLANS: VLAN ID (1-4094)ipv6 vlan subnet X:X::X:X/MVLANSTo clear subnet-based VLAN configuration, use the following command.Command Mode Descriptionno vlan subnet [A.B.C.D/M] Bridge Clears configured VLAN based on subnet.no ipv6 vlan subnet [X:X::X:X/M]To display the subnet-based VLAN configuration, use the following command.Command Mode Descriptionshow vlan subnet EnableGlobalBridgeClears configured VLAN based on subnet.show ipv6 vlan subnet8.1.5 Tagged VLANIn a VLAN environment, a frame’s association with a given VLAN is soft; the fact that agiven frame exists on some physical cable does not imply its membership in anyparticular VLAN. VLAN association is determined by a set of rules applied to the framesby VLAN-aware stations and/or switches.There are two methods for identifying the VLAN membership of a given frame:• Parse the frame and apply the membership rules (implicit tagging).• Provide an explicit VLAN identifier within the frame itself.VLAN TagA VLAN tag is a predefined field in a frame that carries the VLAN identifier for that frame.VLAN tags are always applied by a VLAN-aware device. VLAN-tagging provides anumber of benefits, but also carries some disadvantages.Advantages DisadvantagesVLAN association rules only need to be appliedonce. Tags can only be interpreted by VLAN aware devices.Only edge switches need to know the VLANassociation rules.Edge switches must strip tags before forwardingframes to legacy devices or VLAN-unaware domains.Core switches can get higher performance byoperating on an explicit VLAN identifier.Insertion or removal of a tag requires recalculation ofthe FCS, possibly compromising frame integrity.
