Web Management Guide-R04

Table Of Contents
Chapter 5
| VLAN Configuration
Configuring IP Subnet VLANs
– 197 –
To show the protocol groups mapped to a port or trunk:
1. Click VLAN, Protocol.
2. Select Configure Interface from the Step list.
3. Select Show from the Action list.
4. Select a port or trunk.
Figure 101: Showing the Interface to Protocol Group Mapping
Configuring IP Subnet VLANs
Use the VLAN > IP Subnet page to configure IP subnet-based VLANs.
When using port-based classification, all untagged frames received by a port are
classified as belonging to the VLAN whose VID (PVID) is associated with that port.
When IP subnet-based VLAN classification is enabled, the source address of
untagged ingress frames are checked against the IP subnet-to-VLAN mapping
table. If an entry is found for that subnet, these frames are assigned to the VLAN
indicated in the entry. If no IP subnet is matched, the untagged frames are classified
as belonging to the receiving port’s VLAN ID (PVID).
Command Usage
Each IP subnet can be mapped to only one VLAN ID. An IP subnet consists of an
IP address and a mask. The specified VLAN need not be an existing VLAN.
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.
Packet forwarding within the IP subnet requires that the following conditions
are satisfied:
Inbound packet must be an IP packet (EtherType 0x0800).