User Manual UMN:CLI
V5808
265
To configure subnet-based VLAN, use the following command.
vlan subnet A.B.C.D/M VLANS
Configures subnet based VLAN.
VLANS: VLAN ID (1-4094)
ipv6 vlan subnet X:X::X:X/M
VLANS
To clear subnet-based VLAN configuration, use the following command.
no vlan subnet [A.B.C.D/M]
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.
Clears configured VLAN based on subnet.
8.1.5 Tagged VLAN
In a VLAN environment, a frame’s association with a given VLAN is soft; the fact that a
given frame exists on some physical cable does not imply its membership in any
particular VLAN. VLAN association is determined by a set of rules applied to the frames
by 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 Tag
A 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 a
number of benefits, but also carries some disadvantages.
VLAN association rules only need to be applied
once.
Tags can only be interpreted by VLAN aware devices.
Only edge switches need to know the VLAN
association rules.
Edge switches must strip tags before forwarding
frames to legacy devices or VLAN-unaware domains.
Core switches can get higher performance by
operating on an explicit VLAN identifier.
Insertion or removal of a tag requires recalculation of
the FCS, possibly compromising frame integrity.
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