H3C Technologies H3C S12500 Series Switches - Manual (Page 229)

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3. Use the display vlan all command on all BCBs to see whether the B-VLAN in the BEB is created on
the BCB, and whether the ports connecting the BEB and BCB are both assigned to the B-VLAN. All
ports connecting the BEB and BCB must be assigned to the VLAN.