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4-259
Configuring Protocol-based VLANs
The network devices required to support multiple protocols cannot be easily
grouped into a common VLAN. This may require non-standard devices to
pass traffic between different VLANs in order to encompass all the devices
participating in a specific protocol. This kind of configuration deprives users
of the basic benefits of VLANs, including security and easy accessibility.
To avoid these problems, you can configure this switch with protocol-based
VLANs that divide the physical network into logical VLAN groups for each
required protocol. When a frame is received at a port, its VLAN membership
can then be determined based on the protocol type in use by the inbound
packets.
To configure protocol-based VLANs, follow these steps:
1. First configure VLAN groups for the protocols you want to use
(page 4-247). Although not mandatory, we suggest configuring a separate
VLAN for each major protocol running on your network. Do not add
port members at this time.
2. Create a protocol group for each of the protocols you want to assign to a
VLAN using the protocol-vlan protocol-group command (General
Configuration mode).
Table 4-64 Protocol-based VLAN Commands
Command Function Mode Page
protocol-vlan
protocol-group
Create a protocol group, specifying the
supported protocols
GC 4-260
protocol-vlan
protocol-group
Maps a protocol group to a VLAN IC 4-261
show protocol-vlan
protocol-group
Shows the configuration of protocol groups PE 4-262
show interfaces
protocol-vlan
protocol-group
Shows the interfaces mapped to a protocol
group and the corresponding VLAN
PE 4-263