42CHAPTER 4: ADVANCED MANAGEMENT TASKS
interface modules directly; you configure them through the switch fabric module.
To create VLANs in the CoreBuilder 9000 environment, you configure these components:
■Layer 2 and Layer 3 switching modules — You connect to these individually through the EME (Enterprise Management Engine) and configure the following ports based on your VLAN configuration:
■Front-panel ports — Typically connect external devices to the switching module. The number of front-panel ports varies according to the model of switching module (for example, one model 10/100TX Layer 2 Switching Module offers 20 front-panel ports).
■Backplane port — Connects the switching module to the 24-port Gigabit Ethernet Switch Fabric Module. The Layer 3 switching modules have only one backplane port. Layer 2 switching modules have two backplane ports; you configure the lower-numbered backplane port, which is enabled by default. (The higher-numbered backplane port is available as a trunk port only.) Example: If you are logged into a 20-port Layer 2 interface module via the EME and configure front-panel ports as members of a port-based VLAN that spans modules, you configure port 21 (the lowered-numbered backplane port) as part of the VLAN. When you have multiple VLANs, this module backplane port must be tagged for all but one of the VLANs. (For one VLAN, such as the default VLAN, the backplane port can be untagged, but for the other VLANs, the backplane port must be tagged.)
■Switch Fabric Module —The central backplane for the system. To ensure cross-module communication (for example, within VLANs that span modules), you must configure the switch fabric module to include the VLANs that you configure on your switching modules. You configure the switch fabric module’s Gigabit Ethernet ports (24 ports in a 16-slot chassis module) in accordance with:
■The chassis slot placement and VLAN configuration of your individual switching modules (configured through the EME). For a switching module in slot 1, you configure switch fabric module port 1.
■The chassis slot placement of your GEN interface modules. To create VLANs for these non-local switching modules, you configure their VLANs by configuring the corresponding switch fabric module
