Whether the standby firewall forwards traffic in hot standby deployment

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The standby device does not forward service traffic. However, the device properly forwards traffic sent to it, such as the ICMP packet for pinging the device interface IP address. Therefore, you can view traffic on the standby device.

Other related questions:
Whether the standby device in hot standby deployment can be configured
By default, configurations that can be backed up can be configured only on the active device and automatically synchronized to the standby device. You cannot configure them on the standby device. After you run the hrp slave config enable command on the active device, the standby device obtains the permission for configuring these commands when this command is backed up to the standby device. The configurations on the standby device are also synchronized to the active device. Configurations that cannot be backed up, such as interface IP addresses, can be configured on the standby device.

Whether hot standby can be implemented on virtual firewalls
Yes.

Whether virtual firewalls support hot standby
Yes.

Precautions for active/standby upgrade in hot standby deployment on the USG2000&5000
Precautions for active/standby upgrade in hot standby deployment on the USG2000&5000 are as follows: As for software version upgrade in hot standby deployment, you shall comply with a primary principle. That is, you shall upgrade the active and standby devices individually and upgrade the standby device first and then the active device. In addition, you must disable the HRP function during the upgrade. Note: For software version upgrade in hot standby deployment, the target software versions of the active and standby devices must be the same. Otherwise, the HRP function may fail to be enabled simultaneously. Hardware restrictions Currently, hot standby can be implemented only between two devices. The active and standby devices must have the same product model and version. The active and standby devices must have the same number and types of boards installed in the same arrangement. Otherwise, the information synchronized from the active device does not match the physical configuration of the standby device. As a result, faults occur after an active/standby switchover. If you want to use a Layer-2 interface as a heartbeat interface, add the Layer-2 interface to a VLAN. Then create a VLANIF interface and configure an IP address for it. Use the VLANIF interface as a heartbeat interface and specify remote to specify the IP address of the heartbeat interface on the remote device. Software restrictions The active and standby devices must use the same software version. Otherwise, configuration commands or session list structures of the different software versions may be different. In this case, errors may occur on the active and standby devices when you back up configuration commands and status. The BootROM versions on the active and standby devices must be the same. The operating mode of the active and standby devices must be the same, that is, both the active and standby devices must be in firewall mode or UTM mode. You are advised to use the initial configuration file on both devices. Otherwise, faults may occur after the active/standby switchover because of configuration conflicts. The names, quantities, and configuration sequence of virtual firewalls on the active and standby devices must be the same. The interfaces on the same slot of the active and standby devices must be added to the same security zone. For example, if the GigabitEthernet0/0/1 interface on the active device is added to the Trust zone, the GigabitEthernet0/0/1 interface on the standby device must also be added to the Trust zone. Configurations of heartbeat interfaces (HRP heartbeat link) on the active and standby devices must be consistent. Note: The USG2110-X/2100 and USG2100 BSR/HSR do not support the function of specifying the heartbeat interface IP address of the peer device. Therefore, you cannot use the VLANIF interface as the heartbeat interface. The service interfaces of the active and standby devices use fixed IP addresses. Therefore, you cannot use the dual-system hot backup function together with functions for obtaining IP address automatically, such as PPPoE dial-up, DHCP client, 3G, and XDSL.

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