H3C S5560S-EI Series Configuration Manual page 51

on the other member ports. In this way, the two systems reach an agreement on which ports are
placed in Selected state.
LACP functions
LACP offers basic LACP functions and extended LACP functions, as described in
Table 2 Basic and extended LACP functions
Category
Basic LACP functions
Extended LACP
functions
LACP operating modes
LACP can operate in active or passive mode.
When LACP is operating in passive mode on a local member port and its peer port, both ports cannot
send LACPDUs. When LACP is operating in active mode on either end of a link, both ports can send
LACPDUs.
LACP priorities
LACP priorities include system LACP priority and port priority, as described in
the priority value, the higher the priority.
Table 3 LACP priorities
Type
System LACP
priority
Port priority
LACP timeout interval
The LACP timeout interval specifies how long a member port waits to receive LACPDUs from the
peer port. If a local member port has not received LACPDUs from the peer within the LACP timeout
interval, the member port considers the peer as failed.
The LACP timeout interval also determines the LACPDU sending rate of the peer. LACP timeout
intervals include the following types:
Short timeout interval—3 seconds. If you use the short timeout interval, the peer sends one
•
LACPDU per second.
• Long timeout interval—90 seconds. If you use the long timeout interval, the peer sends one
LACPDU every 30 seconds.
Description
Implemented through the basic LACPDU fields, including the system LACP
priority, system MAC address, port priority, port number, and operational key.
Implemented by extending the LACPDU with new TLV fields. Extended LACP can
implement LACP MAD for the IRF feature.
The switch series can participate in LACP MAD as either an IRF member device or
an intermediate device.
For more information about IRF and the LACP MAD mechanism, see IRF
Configuration Guide.
Description
Used by two peer devices (or systems) to determine which one is superior in link
aggregation.
In dynamic link aggregation, the system that has higher system LACP priority sets
the Selected state of member ports on its side. The system that has lower priority
sets the aggregation state of local member ports the same as their respective peer
ports.
Determines the likelihood of a member port to be a Selected port on a system. A port
with a higher port priority is more likely to become Selected.
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Table 2.
Table 3. The smaller