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Catalyst 2950 Desktop Switch Software Configuration Guide
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Chapter8 Configuring VLANs
VLANs in the VTP Database
• Security Association Identifier (SAID)
• Bridge identification number for TRBRF VLANs
• Ring number for FDDI and TRCRF VLANs
• Parent VLAN number for TRCRF VLANs
• STP type for TRCRF VLANs
• VLAN number to use when translating from one VLAN type to another
The “Default VLAN Configuration” sectiononpage8-16lists the default values and possible ranges for
each VLAN media type.
Token Ring VLANs
Although the Catalyst 2950 switches do not support Token Ring connections, a remote device such as a
Catalyst 5000 series switch with Token Ring connections could be managed from one of the supported
switches. Switches running this IOS release advertise information about these Token Ring VLANs when
running VTP version 2:
• Token Ring TRBRF VLANs
• Token Ring TRCRF VLANs
For more information on configuring Token Ring VLANs, refer to the Catalyst 5000 Series Software
Configuration Guide.
VLAN Configuration Guidelines
Follow these guidelines when creating and modifying VLANs in your network:
• A maximum of 250 VLANs can be active on supported switches. If VTP reports that there are 254
active VLANs, 4 of the active VLANs (1002 to 1005) are reserved for Token Ring and FDDI.
Note The Catalyst 2950-12 and Catalyst 2950-24 switches support only 64 port-based VLANs.
• Before you can create a VLAN, the switch must be in VTP server mode or VTP transparent mode.
For information on configuring VTP, see the “Configuring VTP” section on page 8-12.
• Switches running this IOS release do not support Token Ring or FDDI media. The switch does not
forward FDDI, FDDI-Net, TRCRF, or TRBRF traffic, but it does propagate the VLAN configuration
through VTP.
Default VLAN Configuration
Table 8-6 shows the default configuration for the Ethernet VLAN default and ranges.
Note Catalyst 2950 switches support Ethernet interfaces exclusively. Because FDDI and Token Ring VLANs
are not locally supported, you configure FDDI and Token Ring media-specific characteristics only for
VTP global advertisements to other switches.
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