F3726, F3211, F3174, R5135, R3816-HP Firewalls and UTM Devices High Availability Configuration Guide-6PW100

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Table 10 LACP priorities
T
yp
e Descri
p
tion
System LACP priority
Used by two peer devices (or systems) to determine which one is superior in link
aggregation.
In dynamic link aggregation, the system with higher system LACP priority sets the
Selected state of member ports on its side first, and then the system with lower priority
sets the port state accordingly.
Port aggregation
priority
Determines the likelihood of a member port to be selected on a system. The higher the
port aggregation priority, the higher the likelihood.
3. LACP timeout interval:
LACP timeout interval specifies how long a member port waits to receive LACPDUs from the peer
port. If a local member port fails to receive LACPDUs from the peer within three times the LACP
timeout interval, the member port assumes that the peer port has failed. You can configure the
LACP timeout interval as either the short timeout interval (1 second) or the long timeout interval (30
seconds).
171BAggregating links in static mode
LACP is disabled on the member ports in a static aggregation group. You must manually maintain their
aggregation state.
345BSelecting a reference port
The system selects a reference port from the UP member ports that have the same class-two configurations
as the aggregate interface.
The candidate ports are sorted by aggregation priority, duplex, and speed in the following order:
• Lowest aggregation priority value
• Full duplex/high speed
• Full duplex/low speed
• Half duplex/high speed
• Half duplex/low speed
The one at the top is selected as the reference port. If two ports have the same aggregation priority,
duplex mode, and speed, the one with the lower port number wins.
346BSetting the aggregation state of each member port
After selecting the reference port, the static aggregation group sets the aggregation state of each
member port, as shown in
576HFigure 65. After the static aggregation group has reached the limit on Selected
ports, any port assigned to the group is placed in Unselected state to avoid traffic interruption on the
current Selected ports.