Chapter 21
| VLAN Commands
Configuring Protocol-based VLANs
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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 592).
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 (Global Configuration
mode).
3. Then map the protocol for each interface to the appropriate VLAN using the
protocol-vlan protocol-group command (Interface Configuration mode).
Note:
Traffic which matches IP Protocol Ethernet Frames is mapped to the VLAN
that has been configured with the switch’s administrative IP interface (default VLAN
1). IP Protocol Ethernet traffic must not be mapped to another VLAN or you will lose
administrative network connectivity to the switch. If lost in this manner, network
access can be regained by removing the offending Protocol VLAN rule via the
console. Alternately, the switch can be power-cycled, however all unsaved
configuration changes will be lost.
Table 112: Protocol-based VLAN Commands
Command Function Mode
protocol-vlan
protocol-group
Create a protocol group, specifying the supported
protocols
GC
protocol-vlan
protocol-group
Maps a protocol group to a VLAN IC
show protocol-vlan
protocol-group
Shows the configuration of protocol groups PE
show interfaces
protocol-vlan
protocol-group
Shows the interfaces mapped to a protocol group and the
corresponding VLAN
PE
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