Network topology

There are 2 DC (DC1 and DC2).

Dori, Superfast, Theia and Nori are QFX10000 devices.
QFX21, QFX22, QFX23, QFX24, QFX6 and QFX11 are QFX5100 devices.

EVPN-VXLAN runs on the QFX10k devices.
DCI (EVPN-VXLAN) is done on the QFX10000 devices.
L3 is done on the QFX10k devices.
They use ESI (Ethernet Segment Identifier) on the segments toward the QFX5100 devices.

QFX21, QFX22, QFX23, QFX24, QFX6 and QFX11 do L2 only.

QFX21 and 22 use MC-LAG. QFX23 and 24 use MC-LAG.

QFX6 uses a LAG. QFX11 uses a LAG.