3Com 4007R Implementation Guide - Page 253
Design Guidelines, Switch 4007 Enterprise Management Engine User, Guide
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Key Guidelines for Implementation 253 Design Guidelines s Before you create any VLANs, draw your chassis configuration and carefully identify how the VLANs that are associated with your modules are bridging (or, for Multilayer Switching Modules, bridging or routing). Remember that each VLAN constitutes a subnetwork. If a VLAN spans modules, each participating module must have its attached devices (and router interface, if applicable) configured for that subnetwork. Use your drawing to help you identify the configuration requirements for each port in a VLAN and to ensure that the switch fabric module is configured to pass traffic to the correct VLANs. s To simplify your configuration, try to keep the number of VLANs as small as possible. Where possible, reduce the number of subnetworks. s To ease configuration changes (such as moving a module to another slot while retaining the same VLAN configurations), you can use the staging option. To use this option, enable staging on the module by issuing the module nvData staging command and use the EME staging option to apply the configuration. You can also use EME commands to upload and download module configurations saved on a server. See the Switch 4007 Enterprise Management Engine User Guide for more information about the EME. s If you lose track of your changes in a complicated VLAN configuration, it may be better to perform a nonvolatile data (nvData) reset operation than to make numerous VLAN changes. For example, you can use the module nvData reset command to return to a default module configuration, including the VLAN configuration. See Chapter 6 for more information. s Evaluate whether you really need to use tagging on the front-panel ports of your switching modules. If you do need to tag front-panel ports in your user-configured VLANs, then your attached devices must be IEEE 802.1Q enabled. s In general, tag the backplane ports of the switching modules and the corresponding switch fabric module ports when you define multiple VLANs that span modules (for bridging or routing). When multiple VLANs are defined across the backplane ports and switch fabric module ports, only one VLAN can be untagged and all others must be tagged.
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