Chapter 21
| VLAN Commands
Configuring IP Subnet VLANs
– 609 –
subnet-vlan This command configures IP Subnet VLAN assignments. Use the no form to remove
an IP subnet-to-VLAN assignment.
Syntax
subnet-vlan subnet ip-address mask vlan vlan-id [priority priority]
no subnet-vlan subnet {ip-address mask | all}
ip-address – The IP address that defines the subnet. Valid IP addresses
consist of four decimal numbers, 0 to 255, separated by periods.
mask – This mask identifies the host address bits of the IP subnet.
vlan-id – VLAN to which matching IP subnet traffic is forwarded.
(Range: 1-4094)
priority – The priority assigned to untagged ingress traffic. (Range: 0-7,
where 7 is the highest priority)
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, and 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)#
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