Default HA heartbeat VLAN triple-tagging

By default, HA heartbeat packets are VLAN packets with VLAN ID 999, an outer TPID of 0x8100, ethertype 8890, and an MTU value of 1500. The default proprietary HA heartbeat VLAN tagging uses the following triple tagging format:

TPID 0x8100 VLAN <vlan-id> (by default 999) + TPID 0x88a8 VLAN 10/30 + TPID 0x8100 VLAN 10/30 + ethernet packet

If your switch is compatible with Fortinet's proprietary triple-tagging format then all you need to do is use the following options to give the M1 and M2 interfaces different VLAN tags.

config system ha

set ha-port-dtag-mode proprietary

set hbdev-vlan-id <vlan>

set hbdev-second-vlan-id <vlan>

end

Where:

• ha-port-dtag-mode is set to proprietary and the FortiGate-6000 uses the default triple-tagging format.
• hbdev-vlan-id sets the outer VLAN ID used by HA1 interface heartbeat packets.
• hbdev-second-vlan-id sets the outer VLAN ID used by HA2 interface heartbeat packets. The HA1 and HA2 interfaces must have different outer VLAN IDs if they are connected to the same switch.

If your switch is not compatible with Fortinet's proprietary triple-tagging format, you can use the following options to change the outer TPID and ethertype.

config system ha

set ha-port-dtag-mode proprietary

set ha-port-outer-tpid {0x8100 | 0x88a8 | 0x9100}

set ha-eth-type <ethertype>

end

Where:

• ha-port-dtag-mode is set to proprietary and the FortiGate-6000 uses the default triple-tagging format.
• ha-port-outer-tipd sets the outer TPID to be compatible with the switch. The default outer TPID of 0x8100, is compatible with most third-party switches.
• ha-eth-type sets the HA heartbeat packet ethertype (default 8890) to be compatible with the switch.

If your switch doesn't support triple tagging, see HA heartbeat VLAN double-tagging.

Example triple-tagging compatible switch configuration

The switch that you use for connecting HA heartbeat interfaces does not have to support IEEE 802.1ad (also known as Q-in-Q, double-tagging). But the switch should be able to forward the double-tagged frames. Some switches will strip out the inner tag and Fortinet recommends avoiding these switches. FortiSwitch D and E series can correctly forward double-tagged frames.

This configuration is not required for FortiGate-6000 HA configurations if you have set up direct connections between the HA heartbeat interfaces.

This example shows how to configure a FortiGate-6000 to use different VLAN IDs for the HA1 and HA2 HA heartbeat interfaces and then how to configure two interfaces on a Cisco switch to allow HA heartbeat packets.

This example sets the native VLAN ID for both switch ports to 777. You can use any VLAN ID as the native VLAN ID as long as the native VLAN ID is not the same as the allowed VLAN ID.

1. On both FortiGate-6000s, enter the following command to use different VLAN IDs for the HA1 and HA2 interfaces. The command sets the ha1 VLAN ID to 4091 and the ha2 VLAN ID to 4092:

   config system ha

   set ha-port-dtag-mode proprietary

   set hbdev ha1 50 ha2 100

   set hbdev-vlan-id 4091

   set hbdev-second-vlan-id 4092

   end

2. Use the get system ha or get system ha status command to confirm the VLAN IDs.

   get system ha status
   ...
   HBDEV stats:
    F6KF51T018900026(updated 4 seconds ago):
     ha1: physical/10000full, up, rx-bytes/packets/dropped/errors=54995955/230020/0/0, tx=63988049/225267/0/0, vlan-id=4091
     ha2: physical/10000full, up, rx-bytes/packets/dropped/errors=54995955/230020/0/0, tx=63988021/225267/0/0, vlan-id=4092
    F6KF51T018900022(updated 3 seconds ago):
     ha1: physical/10000full, up, rx-bytes/packets/dropped/errors=61237440/230023/0/0, tx=57746989/225271/0/0, vlan-id=4091
     ha2: physical/10000full, up, rx-bytes/packets/dropped/errors=61238907/230023/0/0, tx=57746989/225271/0/0, vlan-id=4092
   ...

3. Configure the Cisco switch interface that connects the HA1 interfaces to allow packets with a VLAN ID of 4091:

   interface <name>

   switchport mode trunk

   switchport trunk native vlan 777

   switchport trunk allowed vlan 4091

4. Configure the Cisco switch port that connects the HA2 interfaces to allow packets with a VLAN ID of 4092:

   interface <name>

   switchport mode trunk

   switchport trunk native vlan 777

   switchport trunk allowed vlan 4092