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The control plane agrees on the Designated Forwarder and the host still receives every broadcast twice. Multi-point captures, a same-vendor control group, and a packet capture that was quietly lying.
Arista and Cisco NX-OS, an unnumbered eBGP session, an IPv4 route installed with an IPv6 next hop — and no forwarding. The fix is one interface command, and the reason is RFC 8950.
A Go library for driving network devices over SSH. The API, a working read and write example, and the error-handling behavior that will bite you if you assume Netmiko semantics.
An office network with no IPv6 deployment lost web access. The cause was a personal router advertising IPv6 — and a DHCP snooping configuration whose scope did not cover it.