SMC Networks SMC8150L2 manual Configuring Protocol-based VLANs

VLAN Commands 4

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.

Table 4-60 Protocol-based VLAN Commands

Command	Function	Mode	Page
protocol-vlan protocol-group	Create a protocol group, specifying the supported protocols	GC	4-181
protocol-vlan protocol-group	Maps a protocol group to a VLAN	IC	4-182
show protocol-vlan	Shows the configuration of protocol groups	PE	4-183
protocol-group
show interfaces	Shows the interfaces mapped to a protocol group and the	PE	4-183
protocol-vlan protocol-group	corresponding VLAN

To configure protocol-based VLANs, follow these steps:

1.First configure VLAN groups for the protocols you want to use (page 4-168). 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-vlanprotocol-groupcommand (General Configuration mode).

3.Then map the protocol for each interface to the appropriate VLAN using the protocol-vlanprotocol-groupcommand (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)

•frame1 - Frame type used by this protocol. (Options: ethernet, rfc_1042, llc_other)

1.SNAP frame types are not supported by this switch due to hardware limitations.

4-181