Link-Group definition on the USG2000 and USG5000

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The Link-Group function can bind the states of multiple interfaces as a logical group. When any interface in the group is faulty, the system sets the state of other interfaces in the group as Down. After all interfaces in the group resume to be normal, the system sets the state of the interfaces in the entire group to Up again.

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Purposes of the Link-Group on the USG2000 and USG5000
The Link-Group ensures the state consistency of physical interfaces in a group and accelerates the route convergence speed upon link failures.

IP-Link definition on the USG
IP-Link indicates the link accessibility check. The firewall periodically sends ICMP echo requests or ARP requests to the specified destination IP address and waits for responses. If no response is received with the specified period of time, the firewall considers that the current link is faulty and performs subsequent link-related operations. If the firewall receives three consecutive responses over the original link within the subsequently-specified period of time, the firewall considers that the link fault is eliminated and performs subsequent link recovery-related operations.

What is an AS group
An AS group consists of a collection of instances that apply to the same scenario. It is the basis for enabling or disabling AS policies and performing scaling actions.

Definition of SSL VPN for USG2000 and USG5000 series devices
SSL VPN is based on the SSL protocol for the security of VPN remote access technology, mobile office workers (known as remote users in SSL VPN) SSL VPN can be safe and convenient access to the enterprise network, access to enterprise intranet resources, Improve work efficiency.

Components of the physical server group on the USG2000 and USG5000 series
A physical server group consists of multiple physical servers that process service traffic.

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