Lenovo RackSwitch G8264CS Application Manual page 188

Figure 17. VLAG Application with Multiple Layers
Wherever ports from both peered switches are aggregated to another device, the
aggregated ports must be configured as a VLAG. For example, VLAGs 1 and 3
must be configured for both VLAG Peer A switches. VLAGs 2 and 4 must be
configured for both VLAG Peer B switches.VLAGs 3, 5, and 6 must be configured
on both VLAG Peer C switches. Other devices connecting to the VLAG peers are
configured using regular static or dynamic LAGs.
Note: Do not configure a VLAG for connecting only one switch in the peer set to
another device or peer set. For instance, in VLAG Peer C, a regular LAG is
employed for the downlink connection to VLAG Peer B because only one of the
VLAG Peer C switches is involved.
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G8264CS Application Guide for ENOS 8.4