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54-1
Chapter 54: Protocol-based VLAN Commands
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 52-6).
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).
3. Then map the protocol for each interface to the appropriate VLAN using the
protocol-vlan protocol-group command (Interface Configuration mode).
protocol-vlan protocol-group (Configuring Groups)
This command creates a protocol group, or to add specific protocols to a group. Use
the no form to remove a protocol group.
Syntax
protocol-vlan protocol-group group-id [{add | remove} frame-type frame
protocol-type protocol]
no protocol-vlan protocol-group group-id
• group-id - Group identifier of this protocol group. (Range: 1-2147483647)
• frame
1
- Frame type used by this protocol. (Options: ethernet, rfc_1042,
llc_other)
Table 54-1 Protocol-based VLAN Commands
Command Function Mode Page
protocol-vlan protocol-group Create a protocol group, specifying the supported protocols GC 54-1
protocol-vlan protocol-group Maps a protocol group to a VLAN IC 54-2
show protocol-vlan
protocol-group
Shows the configuration of protocol groups PE 54-3
show interfaces
protocol-vlan protocol-group
Shows the interfaces mapped to a protocol group and the
corresponding VLAN
PE 54-4
1. SNAP frame types are not supported by this switch due to hardware limitations.