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How Do I Configure IP-Link on a USG?

Publication Date:  2019-01-22 Views:  247 Downloads:  0

Issue Description

How do I configure IP-link on a USG?

Handling Process

IP-link automatically checks the status of service links. It can detect the status of the links indirectly connected to a firewall for service continuity.

When multiple IP-links are configured on a firewall, the IP-links send link detection packets concurrently. As a result, the CPU usage increases dramatically. To resolve this problem, enable the IP-link group function to bundle IP-links into an IP-link group. The IP-links in the IP-link group send link detection packets in batches to reduce the CPU usage increase.


The following is an IP-link configuration example on a USG:


1. The USG functions as a DHCP client to send ICMP packets to the destination address of the DHCP server for link detection.

<USG > system-view

[USG] ip-link 1 destination interface GigabitEthernet 0/0/2 mode icmp next-hop dhcp


2. Configure IP-link 1 to send ICMP packets to for link detection.

<USG> system-view

[USG] ip-link 1 destination timer 5



1. If more than 32 IP-links are configured on the device, run the ip-link group enable command to enable the IP-link group function and perform the following configurations:

a. Run the ip-link group add linkid beginlinkID [to endlinkID] command to add multiple IP-links to an IP-link group.

b. Run the ip-link group interval interval command to set an interval at which the IP-link group sends detection packets.

A larger interval reduces the CPU load but degrades link detection sensitivity.

2. If less than 32 IP-links are configured on the device, you are advised to run the ip-link check enable command to enable IP-link detection. Alternatively, you can enable the IP-link group function.

Generally, IP-links can associate with other functions based on networking. For details about the association configuration, see the product documentation.