To install the new SCBs and linecards (T140764), we first need to upgrade to a more recent JunOS. We are targeting JTAC's current recommended release, 13.3R9.
Due to redundancy reasons, we cannot do cr1-eqiad until the new eqiad-esams link is provisioned (T136717). Hence, we will first start with cr2-eqiad.
The process is roughly the following:
- Drain cr2-eqiad
- Adjust VRRP priorities
- Adjust OSPF priorities
- Drain lvs* pair (stop pybal)
- Disable transits/peering
- Wait 5-10 minutes
- Upgrade cr2-eqiad (both REs) and reboot
- set chassis network-services enhanced-ip
- Reboot again
- Un-drain cr2-eqiad (i.e. reverse (2))
- Undrain eqiad from gdnsd
(With the last two steps possibly happening after we also install the new SCBs, just to be on the safe side)