User manual

C HAPTER 4 | Configuring the Switch
Protocol VLANs
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PROTOCOL 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 being
used by the inbound packets.
COMMAND USAGE
◆ To configure protocol-based VLANs, follow these steps:
1. First configure VLAN groups for the protocols you want to use
(page 173). 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 Configure Protocol (Add) page.
3. Then map the protocol for each interface to the appropriate VLAN
using the Configure Interface (Add) page.
◆ When MAC-based, IP subnet-based, and protocol-based VLANs are
supported concurrently, priority is applied in this sequence, and then
port-based VLANs last.
CONFIGURING
PROTOCOL VLAN
GROUPS
Use the Protocol to Group Mapping Table to create protocol groups.
PATH
Advanced Configuration, VCL, Protocol-based VLANs, Protocol to Group
PARAMETERS
These parameters are displayed:
◆ Frame Type – Choose Ethernet, LLC (Logical Link Control), or SNAP
(SubNetwork Access Protocol - RFC 1042) as the frame type used by
this protocol.
◆ Value – Values which define the specific protocol type. The fields
displayed depend on the selected frame type:
Ethernet – EtherType value. (Range: 0x0600-0xffff; Default: 0x0800)