Chapter 21
| VLAN Commands
Configuring IP Subnet VLANs
– 591 –
Default Setting
Priority: 0
Command Mode
Global Configuration
Command Usage
â—† Each IP subnet can be mapped to only one VLAN ID. An IP subnet consists of an
IP address and a subnet mask. The specified VLAN need not be an existing
VLAN.
â—† When an untagged frame is received by a port, the source IP address is checked
against the IP subnet-to-VLAN mapping table, and if an entry is found, the
corresponding VLAN ID is assigned to the frame. If no mapping is found, the
PVID of the receiving port is assigned to the frame.
â—† The IP subnet cannot be a broadcast or multicast IP address.
â—† When MAC-based, IP subnet-based, or protocol-based VLANs are supported
concurrently, priority is applied in this sequence, and then port-based VLANs
last.
Example
The following example assigns traffic for the subnet 192.168.12.192, mask
255.255.255.224, to VLAN 4.
Console(config)#subnet-vlan subnet 192.168.12.192 255.255.255.224 vlan 4
Console(config)#
show subnet-vlan This command displays IP Subnet VLAN assignments.
Command Mode
Privileged Exec
Command Usage
â—† Use this command to display subnet-to-VLAN mappings.
â—† The last matched entry is used if more than one entry can be matched.
Example
The following example displays all configured IP subnet-based VLANs.
Console#show subnet-vlan
IP Address Mask VLAN ID Priority
--------------- --------------- ------- --------
192.168.12.0 255.255.255.128 1 0
192.168.12.128 255.255.255.192 3 0
192.168.12.192 255.255.255.224 4 0
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