From docs:
In a preprovisioned Virtual Chassis or VCF, you configure the
role for each member by associating it with the member switch's serial number, and the Virtual Chassis assigns default primary-role priorities based on the assigned role.
root@QFX-241# run show virtual-chassis status
Auto-provisioned Virtual Chassis Fabric
Fabric ID: 2ec9.5e97.5cf4
Fabric Mode: Mixed
Mstr Mixed Route Neighbor List
Member ID Status Serial No Model prio Role Mode Mode ID Interface
0 (FPC 0) Prsnt VB3717170046 qfx5100-96s-8q 129 Backup Y F 1 vcp-255/0/96
1 (FPC 1) Prsnt VB3717170002 qfx5100-96s-8q 129 Master* Y F 4 vcp-255/0/103
0 vcp-255/0/96
4 (FPC 4) Prsnt PD3717050744 ex4300-48p 0 Linecard Y F 1 vcp-255/1/0
{master:1}[edit]
root@QFX-241# set virtual-chassis member 0 mastership-priority 250
{master:1}[edit]
root@QFX-241# commit check
[edit virtual-chassis]
'member 0'
Can't have mastership priority configuration with preprovisioned or auto-provisioned set
error: configuration check-out failed
Anyway to make member 0 to be master ?
thanks!!