Asus GigaX2124 - Manual (Page 45)

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Chapter 4 - Configuration Management
ASUS GigaX2124
members are in the same speed and full duplex mode, then the trunk
group will set up successfully. If one of the members is not in the same
speed or full duplex mode, the trunk will not set correctly. Check the link
partner and change the settings to have the same speed and full duplex
mode for all the members of your trunk group.
All the ports in the link aggregation group MUST operate in full-
duplex mode at the same speed.
All the ports in the link aggregation group MUST be configured in
auto-negotiation mode or full duplex mode. This configuration will
make the full duplex link possible. If you set the ports in full duplex
force mode, then the link partner MUST have the same setting.
Otherwise the link aggregation could operate abnormally.
All the ports in the link aggregation group MUST have the same
VLAN setting.
All the ports in the link aggregation group are treated as a single
logical link. That is, if any member changes an attribute, the others
will change also. For example, a trunk group consists of port 1 and
2. If the VLAN of port 1 changes, the VLAN of port 2 also changes
with port 1.
Note
Figure 32. Link aggregation