Temporarily Add System VLAN to VEM

You can temporarily add system vlans with vemset if someone forgot and rebooted an ESXi host:

vemset system-vlan <vlan-id> ltl <ltl-num>

Example: If someone forgot to add management as a system vlan on their vEthernet port profile, and is now locked out of the host.

Check which vmk port you want:

~ # esxcfg-vmknic -l

Interface  Port Group/DVPort   IP Family IP Address                              Netmask         Broadcast       MAC Address       MTU     TSO MSS   Enabled Type   

vmk0       130                 IPv4      14.17.125.14                            255.255.255.0   14.17.125.255   00:50:56:7c:24:a9 1500    65535     true    STATIC 

Find the ltl:

~ # vemcmd show port

  LTL   VSM Port  Admin Link  State  PC-LTL  SGID  Vem Port

   17     Eth4/1     UP   UP    F/B*    305     0  vmnic0

   18     Eth4/2     UP   UP    F/B*    305     0  vmnic1

   49      Veth3     UP   UP    FWD       0     0  vmk0

Find the vlan:

~ # vemcmd show port vlans

                        Native  VLAN   Allowed

  LTL   VSM Port  Mode  VLAN    State  Vlans

   17     Eth4/1   T        1   FWD    64,125,129,225,325

   18     Eth4/2   T        1   FWD    64,125,129,225,325

   49      Veth3   A      125   FWD    125

Make it a system VLAN:

~ # vemset system-vlan 125 ltl 49