Configuring Link-Group Using the Web UI

This section describes how to configure the link-group function using the Web UI.

Context

The link group function binds the status of several interfaces to form a logical group. If one interface in the logical group is faulty, the system changes the status of the other interfaces to Down. After all the interfaces recover, the system changes the status of the interfaces to Up. The link group function ensures that the status of the upstream and downstream interfaces are consistent with each other, avoiding the inconsistency of upstream and downstream paths upon active/standby switchover.

The link group function supports interface status management in the same virtual system and interface status management of the root system and different virtual systems.

After an Eth-Trunk interface is added to a link group, the system considers the Eth-Trunk interface to be faulty only when all Eth-Trunk member interfaces go Down.

If some interfaces are added to both the Eth-Trunk and Link-group and you need to delete one of them from the Eth-Trunk, you must remove the interface from the link group and then delete the interface from the Eth-Trunk. Otherwise, services will be impacted.

To associate the interface status of different link-groups, configure a link-group monitor group. When configuring a link-group monitor group, properly plan the relationship between sub-groups and link-groups to achieve the association of interface status in different link-groups. The relationships between the link-group monitor group, sub-groups in the link-group monitor group, link-groups, and interfaces in the link-groups are as follows:

A link-group can be added to only one sub-group of a link-group monitor group.
Link-groups in a sub-group of a link-group monitor group are independent of each other and do not affect each other.
Different sub-groups in a link-group monitor group affect each other only in the following situation: The device forcibly changes all interfaces in link-groups of other sub-groups to Down only when the state of all link-groups in a sub-group is fault.
Different link-group monitor groups are independent of each other and do not affect each other.

Procedure

Choose System > High Availability > Link-Group > Link-Group.

Click

on the right of the link-group to be configured to add the interface to the link-group or bind the link-group to the CPU of the SPU, and click OK.

Parameter	Description
Link-Group ID	Indicates the ID of the current link-group.
Interface	Adds interfaces to the link group. If an interface belongs to a virtual system and it is required that the interface status should be associated with the interface status in the root system, you need to add the interface that belongs to the virtual system to the Link-Group group in the root system and click the interface name in the list to view the virtual system to which the interface belongs. NOTE: Do not add the interface used for logging in to the web UI to the link group. Otherwise, web access will be interrupted due to other interface faults.
Interval for Monitoring Interface Status	Set an interface status monitoring timer for the current link-group. After a faulty interface in the link-group recovers, the system sets the state of other interfaces in the link-group to Up and checks whether all interfaces in the link-group are Up after twice of the interface status monitoring timer. If any interface is still Down, the system sets the state of other interfaces in the link-group to Down. Therefore, before configuring a link-group, check whether the delayed Up function is configured on the local interface to be added to the link-group and the peer interface. If yes, ensure that the interface status monitoring timer is longer than half of the interface Up delay to prevent frequent interface flapping, which interrupts services.
Minimum Number of CPUs on SPUs	Limits the minimum number of CPUs on SPUs. After Minimum Number of CPUs on SPUs is enabled, if the CPU faults occur, the device is triggered to check the number of current CPU. If the number of current CPU is smaller than Number, the device turns the status of all valid interfaces in the link-group to Down. Only the USG6635E/6655E, USG6680E and USG6712E/6716E support this parameter.
Number	Indicates the minimum number of CPUs on SPUs. Only the USG6635E/6655E, USG6680E and USG6712E/6716E support this parameter.

Optional: Configure a link-group monitor group to associate the status of interfaces in different link-groups.
1. Choose System > High Availability > Link-Group > Link-Group-Monitor.
2. Click Add, set the link-group monitor group name, create sub-groups, add link-groups to the sub-groups, and click OK.