With the new eqiad MPC7E linecards (see T304712)
And the work done in T308331: eqiad: move non WMCS servers out of rack D5, we now have the capacity to run a single 40G link from row C and D to the core routers.
This will bring multiple benefits:
- Improve performance and help improve T291627: Packet Drops on Eqiad ASW -> CR uplinks (right now two large flows being balanced on the same 10G link can cause packet drops)
- Standardize LACP bundles (right now the 4 links end on multiple linecards and both spines (fpc2/fpc7), more explicit failure scenarios
- Clean up cabling (remove 12 fibers running across the cage)
- Clean up switch/router config (less interfaces, no need for bandwidth-threshold knobs)
- Anticipate link move from old 10G linecards to new 40/100G
The main downside being:
- Discrepancies between rows A/B and C/D, which is weak compared to the benefits. Those rows are already different anyway as they have less prod racks