Huawei Quidway S6500 Series Operation Manual page 59

Operation Manual - Port
Quidway S6500 Series Ethernet Switches
In a static LACP aggregation group, the system sets the ports to active or inactive state
based on these rules:
Based on the descending order of priority levels from full duplex/high speed, to full
duplex/low speed, to half duplex/high speed and till half duplex/low speed, the
system sets the port with the highest priority to active state, and others to inactive
state.
The system sets to inactive state the ports which connect to different peer devices
from that one the active port with minimum port number connects to, or the ports in
different aggregation groups though they are connected to the same peer device.
The system sets to inactive state the ports which cannot aggregate with the active
port with minimum port number, due to hardware limit, for example, trans-board
aggregation unavailable.
The system sets to inactive state the ports with basic configurations different from
that of the active port with minimum port number.
Since only a defined number of ports can be supported in an aggregation group, then if
the active ports in an aggregation group exceed the port quantity threshold for that
group, the system shall set some ports with smaller port numbers (in ascending order)
as selected ports and others as standby ports. Both selected and standby ports can
transceive LACP protocol, but standby ports cannot forward user service packets.
II. Dynamic LACP aggregation
Dynamic LACP aggregation may automatic adding/deleting by the system but prohibits
manual configuration of users. Dynamic LACP aggregation can be established even for
a single port, as is called single port aggregation. LACP is enabled at dynamic
aggregation ports. Only the ports with the same speed, duplex mode and basic
configuration and connected to the same device can be aggregated dynamically.
Since only a defined number of ports can be supported in an aggregation group, then if
the ports in an aggregation group exceed the port quantity threshold for that group, the
system shall set some ports with smaller system IDs (system priority + system MAC
address) and port IDs (port priority + port number) as selected ports and others as
standby ports. If not, all member ports are selected ports. Both selected and standby
ports can transceive LACP protocol, but standby ports cannot forward user service
packets. Among the selected ports of an aggregation group, the one with minimum port
number serves as the master port for that group and others are sub-ports.
In comparing system IDs, the system first compares system priority values; if they are
equal, then it compares system MAC addresses. The smaller system ID is considered
prior. Comparing port IDs comes in the same way: the system first compares port
priority values and then port numbers and the small port ID is considered prior. If
system ID changes from non-priority to priority, then the selected or standby state is
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Chapter 2 Link Aggregation Configuration