Adding vPC to VXLAN | Network Direction
vPC and VXLAN are both fantastic technologies. vPC gives us redundancy at the host, and VXLAN gives us layer 2 networks over a layer-3 fabric.
The good news is that we can join the two! Now you can have the best of both worlds! But there are a few things that you need to know about first.
For example, vPC breaks the pure spine/leaf architecture, as it needs a peer-link between a pair of leaf switches.
In addition to this, the pair of switches need to look like a single switch to the rest of the fabric. To solve this, we need a secondary IP on our loopback interface.
Remember to be careful with BGP peering and loopback interfaces. If there’s a peer-link failure, the loopback on the secondary will be shut down!
Finally, you want to consider the backup routing SVI. This allows the peer-link to carry layer-3 traffic if the uplinks to the spine are down.
vPC Videos:
https://www.youtube.com/playlist?list=PLDQaRcbiSnqFByfVJrplYwGfArAMGqtp8
VXLAN Videos:
https://www.youtube.com/playlist?list=PLDQaRcbiSnqFe6pyaSy-Hwj8XRFPgZ5h8
Overview of this video:
0:00 Introduction
0:36 Review of vPC and VXLAN
4:06 Combining vPC and VXLAN
6:51 Best Practices
8:12 Backup Routing SVI
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