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Building network automation solutions

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Building a L3-Only Data Center with Cumulus Linux

Dinesh Dutt was the guest speaker in the second Leaf-and-Spine Fabric Design session. After I explained how you can use ARP/ND information to build a layer-3-only data center fabric that still support IP address mobility Dinesh described the details of Cumulus Linux redistribute ARP functionality and demoed how it works in a live data center.

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  1. Cracked my mind, but can someone point me to the answers for two questions:
    1. how Linux accepts two interfaces with the same IP /32 addresses? Here it's mentioned like the matter of known fact, but I still wonder, never seen it before
    2. By what standard Linux will send ARP request on interface with /32 IP address? I'm talking here about Dual-connected Host configuration via the web-link I provided before. From my perspective static mac record for default gateway should be manually provisioned


  2. I'm curious about how they handle intra-vlan traffic for hosts connected on different ToR switches. Proxy-arp/nd for unresolved addresses?


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