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14 Link Aggregation
14.3 Description of the link aggregation extended functionality
14.3.1 Standby link functionality
(1) Description
The standby link functionality replaces a faulty port with a standby port in the same channel
group to maintain the number of active ports in the channel group. This functionality can
prevent a reduction of available bandwidth if a fault occurs.
This functionality is available only when static link aggregation is used.
(2) How a standby link is selected
The maximum number of active ports in a channel group is set in configuration mode. The
rest of the ports in the channel group are standby ports.
Standby ports are selected based on the port priority set in configuration mode and the port
number. The following table describes the selection principle.
Table 14-5 Standby port selection principle
Precedence
High
↑
↓
Low
The figure below shows an example that explains how the standby link functionality works.
In this example, four ports belong to a channel group, and the maximum number of active
ports is 3.
Figure 14-3 Example of standby link operation
(3) Standby link modes
The standby link functionality has the following two modes:
Link-down mode
In link-down mode, the status of the standby links (standby ports) changes to
link-down. Ports on the remote device that do not support the standby link
functionality can also be used as standby ports.
Link-not-down mode
226
Parameter
Remarks
Port priority
Ports in the channel group are selected as standby ports in
ascending order of port priority level (port with the lowest priority is
selected first).
Port number
Ports in the channel group are selected as standby ports in
descending order of port number (the port with the largest port
number is selected first).
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