VLAN Configuration Rules

Web-based switch management software does not perform VLAN database consistency checks when you create VLAN configurations with VTP V2 mode disabled. As a result, you can incorrectly set VLAN parameters that the software discovers only when you unsuccessfully try to re-enable VTP V2 mode. To resolve these configuration errors, you must review the entire VLAN database and modify the incorrect configuration.

Configuration errors can occur when:

VTP V2 Mode Enabled

When VTP V2 mode is enabled and you are configuring Token Ring concentrator relay function (TRCRF) media, follow these rules:

When VTP V2 mode is enabled and you are configuring VLAN media other than TRCRF, do not specify a backup CRF. This rule applies when you enter commands through the command-line interface (CLI).

When VTP V2 mode is enabled and you are configuring a TRBRF media, you must specify a bridge number.

VTP V2 Mode Disabled

When VTP V2 mode is disabled, no VLAN can have an STP type set to AUTO. This rule applies to FDDI-NET and Token Ring-NET VLANs when you are using web-based switch management software.

Note: When you use the CLI to configure VLANs, this rule applies to Ethernet, FDDI, FDDI-NET, Token Ring, and Token Ring-NET VLANs.

Translational Bridging

When configuring a VLAN that requires translational bridging (values are not set to 0), you must follow these rules: