Token Ring Vlans; Configuration Guidelines For Normal-Range Vlans - Cisco Catalyst 2950 Software Configuration Manual

Chapter 13 Configuring VLANs
This section includes information about these topics about normal-range VLANs:
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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 VTP version 2 advertise information about these Token Ring VLANs:
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For more information on configuring Token Ring VLANs, refer to the Catalyst 5000 Series Software
Configuration Guide.

Configuration Guidelines for Normal-Range VLANs

Follow these guidelines when creating and modifying normal-range VLANs in your network:
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78-11380-04
Token Ring VLANs, page 13-7
Configuration Guidelines for Normal-Range VLANs, page 13-7
VLAN Configuration Mode Options, page 13-8
Saving VLAN Configuration, page 13-9
Default Ethernet VLAN Configuration, page 13-10
Creating or Modifying an Ethernet VLAN, page 13-10
Deleting a VLAN, page 13-12
Assigning Static-Access Ports to a VLAN, page 13-13
Token Ring TrBRF VLANs
Token Ring TrCRF VLANs
See Table 13-1 for the maximum number of supported VLANs per switch model. On a switch
supporting 250 VLANs, if VTP reports that there are 254 active VLANs, four of the active VLANs
(1002 to 1005) are reserved for Token Ring and FDDI.
Normal-range VLANs are identified with a number between 1 and 1001. VLAN numbers 1002
through 1005 are reserved for Token Ring and FDDI VLANs.
VLAN configuration for VLANs 1 to 1005 are always saved in the VLAN database. If VTP mode
is transparent, VTP and VLAN configuration is also saved in the switch running configuration file.
The switch also supports VLAN IDs 1006 through 4094 in VTP transparent mode (VTP disabled)
when the enhanced software image is installed. These are extended-range VLANs and configuration
options are limited. Extended-range VLANs are not saved in the VLAN database. See the
"Configuring Extended-Range VLANs" section on page
Before you can create a VLAN, the switch must be in VTP server mode or VTP transparent mode.
If the switch is a VTP server, you must define a VTP domain or VTP will not function.
Catalyst 2950 switches 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.
The switch supports 64 spanning-tree instances. If a switch has more active VLANs than supported
spanning-tree instances, spanning tree can be enabled on 64 VLANs and is disabled on the
remaining VLANs. If you have already used all available spanning-tree instances on a switch,
adding another VLAN anywhere in the VTP domain creates a VLAN on that switch that is not
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Catalyst 2950 Desktop Switch Software Configuration Guide
Configuring Normal-Range VLANs
13-7