Shown by the master here
user@switch> show virtual-chassis
Virtual Chassis ID: 0019.e250.47a0
Virtual Chassis Mode: Enabled
Mastership Mixed Neighbor List
Member ID Status Serial No Model priority Role Mode ID Interface
0 (FPC 0) Prsnt AK0207360276 ex4200-24t 249 Master* N 8 vcp-0
1 vcp-1
1 (FPC 1) Prsnt AK0207360281 ex4200-24t 248 Backup N 0 vcp-0
2 vcp-1