Appendix D. Extending VLANs Within Layer 3 Switches
Some Layer 3 switches will perform Layer 3 processing only at the interface level in hardware and have no concepts of VLANs and VLAN databases. Routers also fall into this category. This appendix explains how to set up a broadcast domain between ports on a device with only Layer 3 interfaces. This appendix also explains how to map these broadcast domains to ISL or 802.1Q trunks to extend a switch VLAN into a Layer 3 device.
A Layer 3-only device, such as a router or a 2948G-L3 switch, is specialized to process packets based on Layer 3 header information.
Within a Layer 3 device, bridging software can be enabled and ports can be assigned to bridge groups.
All ports in a common bridge group are ...
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