The big idea is to support the same IP address in multiple locations, but to NOT have fate-sharing, where a problem like a bridging loop and resulting broadcast storm at one site would take down the other site. That means we can’t just throw up a tagged VLAN link (trunk) between the DCs. Instead, we have to divide the L2 broadcast domain (the VLAN) into different L2 domains separated by a routed segment. This way we’ve created two failure domains that will not share fate.
This is one of a multi-part series on the Ethernet switching landscape I wrote to support a 2-hour presentation I made at Interop Las Vegas 2014. Part 1 of this written series appeared on NetworkComputing.com. Search for the rest of this series. One of the more specialized featured that appears in a limited number of […]
A few weeks ago, I was fortunate enough to gather together 3 engineers with experience deploying Cisco Overlay Transport Virtualization (OTV) to record a deep dive on Packet Pushers. We built an outline offline, researched the details, and then ended up talking for nearly 2 hours on the topic. Because the conversation was so long, […]