When you stretch a cluster, a route to the witness host is added to each ESXi host in the stretched cluster. You must delete these routes to use witness traffic separation.

Procedure

  1. Open an SSH connection to the first ESXi host in the stretched cluster.
  2. Log in as root.
  3. Run the following command:
    esxcli network ip route ipv4 list
    The output returns something like:
    Network      Netmask        Gateway       Interface  Source
    -----------  -------------  ------------  ---------  ------
    default      0.0.0.0        172.18.15.1   vmk2       MANUAL
    169.254.0.0  255.255.255.0  0.0.0.0       vmk1       MANUAL
    172.18.7.0   255.255.255.0  0.0.0.0       vmk3       MANUAL
    172.18.13.0  255.255.255.0  0.0.0.0       vmk5       MANUAL
    172.18.14.0  255.255.255.0  172.18.7.253  vmk3       MANUAL
    172.18.15.0  255.255.255.0  0.0.0.0       vmk2       MANUAL
    172.18.21.0  255.255.255.0  172.18.7.253  vmk3       MANUAL
  4. Delete the route to the witness host. For example:
    esxcfg-route -d 172.18.14.0/24 172.18.7.253
  5. Repeat these steps for each ESXi host in the stretched cluster.