and we are *done*
work just did a major migration from #mstp spanning tree, to a #EVPN #backbone spine/leaf configuration, where the leafs are connected with multi-chassis #lacp.
~12s outage per switch as we converted from old-world to new-world, including updating the mac-tables for all switches in our network.
6 months of preparation. 1 month of *serious* prep. 1 day move a few non-critical systems, and let them percolate. Then, 7 days of swingshift to move everything else..
@galaxis I did almost all of the configuration work. We trained our coworkers in the new system. Coworkers spent probably a week during the first 6 months discussing things informally, then had a solid week of documentation and learning the new system.
Actual move was: one or two people in the DC, and two people remote. Remote people handled monitoring, clicking DownTimes, and configuration changes. People in the DC did the cabling and (when necessary) moving of hardware.
@galaxis probably 70% of my effort in the first 6 months was reverse engineering how the new vendor did stuff, so we could automate it.
For a vendor that properly supports automation, it can probably be done a lot faster.
peter hessler @openbsd
Alexander Bochmann