We started with simple questions like “what is an interface” and “how do they get such weird names in some Linux distributions” which quickly turned into a complex discussion about kernel objects and udev, and details of implementing logical interfaces that are associated with ASIC front-panel physical ports.
Other topics we found interesting:
- What types of interfaces would you typically see?
- How do you configure Linux interfaces?
- How can you stack interfaces and which combinations make sense?
- How would you use Linux interfaces to deal with VLANs and bridge domains?
- The history of bridging and VLAN filtering in Linux, and scalability enhancements made to Linux bridge in recent years
- Who is running Spanning Tree Protocol on a Linux bridge?
- How are tunnel interfaces implemented in Linux, and what is the role of a tunnel interface driver?
- What are lightweight tunnel interfaces and why do we need them to make MPLS on Linux scale?
- How are the tunnel interfaces accelerated in hardware?
- How multipoint VXLAN tunnels make Linux-based VXLAN implementations scalable
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