Forwarding Data Between VLANs
If you create a LAN that contains many VLANs, you typically still need all devices to be able to send data to all other devices; however, Layer 2 switching logic purposefully does not forward Ethernet frames between VLANs. The solution? Routing, which is a Layer 3 function. This next topic discusses some concepts about how to route data between VLANs.
First, it helps to know a few terms about some categories of LAN switches. Most of the Ethernet switch functions described in this book so far use the details and logic defined by OSI Layer 2 protocols. For example, Chapter 6, “Building Ethernet LANs with Switches,” discussed how LAN switches receive Ethernet frames (a Layer 2 concept), look at the destination Ethernet ...
Get CCNA Data Center DCICN 640-911 Official Cert Guide now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.
