A VLT link aggregation is created by creating a VLT port channel on each of the MX9116N switches. First create the uplink VLT port channel on both switches and assign the appropriate VLANs.
Here are the port channels that are created on switch one:
MX9116-A1# show running-configuration interface port-channel 1
!
interface port-channel1
description "Uplink to DataCenter"
no shutdown
switchport mode trunk
switchport trunk allowed vlan 96, 1711-1714, 2711-2713
mtu 9216
vlt-port-channel 1
MX9116-A1# show port-channel summary
Flags: D - Down I - member up but inactive P - member up and active
U - Up (port-channel) F - Fallback Activated
--------------------------------------------------------------------------------
Group Port-Channel Type Protocol Member Ports
--------------------------------------------------------------------------------
1 port-channel1 (D) Eth DYNAMIC 1/1/41(P) 1/1/42(P)
1000 port-channel1000 (U) Eth STATIC 1/1/37(P) 1/1/38(P) 1/1/39(P) 1/1/40(P)
MX9116-A1#
MX9116-A1# show running-configuration interface port-channel 1
!
interface port-channel1
description "Uplink to DataCenter"
no shutdown
switchport mode trunk
switchport access vlan 1
switchport trunk allowed vlan 96, 1711-1714, 2711-2713
mtu 9216
vlt-port-channel 1