Hello everyone,
Today I will share with you High Availability.
IP-Link, automatic service link reachability detection, detects the status of the links indirectly connected to the FW to ensure service continuity.
IP-Link monitoring an IP address, this object can track the status of a Target by ICMP or ARP, when the target is unreachable the object turn to DOWN state. If you used it in some Policy, the policy won't be available in the monitoring is in the DOWN stage.
Overview
IP-Link enables the FW to regularly send probe packets to a specific destination IP address and determines whether faults occur based on the reply packets.
After the FW does not receive any response packet within three probe intervals (15s by default) after sending three probe packets, the FW considers the current link to be faulty, and the IP-Link status is Down. The FW performs operations for the IP-Link Down event, such as the active/standby switchover of hot standby. After the link recovers from the fault, the FW considers that the link fault is cleared only after it receives three consecutive response packets. Then the IP-Link status becomes up. That is, the IP-Link status does not immediately become up after the link fault is rectified. Instead, it becomes up after three probe intervals (15s by default).
Example Application
IP-Link in the Policy-based Routing Environment
When an IP link is up, the link is reachable, and PBR is valid to guide traffic forwarding.
When an IP link is down, the link is unreachable, and PBR is invalid. Packets are forwarded based on the routing table
Configuring IP-Link Using the Web UI
1. Choose System > High Availability > IP-Link.
2. Click to create IP-link on the Add IP-Link page.
Packet Interval | Indicates the interval for sending probe packets. |
Maximum Number of Failed Attempts | Indicates the maximum number of failed attempts. |
Minimum Number of Active Nodes | Indicates the minimum number of active nodes for health check. If the minimum number of active nodes is smaller than the number of member links, the IP-link state becomes Down. |
Type | Indicates IPv4 and IPv6. |
Detected IP Address/Domain | Indicates the destination IP address or domain name to be detected. |
Interface | Indicates the interface type and interface number of the local end of the IP-link. |
Mode | Indicates ICMP and ARP modes. |
3. Click OK.
Display ip-link verbose
Example:
That is all I want to share with you! Thank you!
