Similar to T295691, T295690, T316529.
The Junos 21 branch is now in Junos recommended versions for our access switches, see https://kb.juniper.net/InfoCenter/index?page=content&id=KB21476&smlogin=true
Upgrading them brings several advantages:
* Keeping a tight Junos version spread (we currently have 14, 17, 18, 20)
* Leveraging features improvements (eg. DNS in mgmt-junos see T269340)
* Fixing low risk security issues
Those switches are `L2` only, so it's less urgent as they're not exposed to the Internet, and they're in VCs so it means all members have to go down at the same time (we're not trying ISSU and similar).
|Device|Scheduled for|Status|
|---|---|---|
|asw2-ulsfo| Jan 24th - 12:30UTC | |
|asw1-eqsin| Jan 11th - 10:00UTC | {icon check color=green} Upgraded from 14 to 20 |
|asw2-esams| Jan 12th - 10:00UTC | {icon check color=green} Upgraded from 18 to 21 |