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Aggregation-enabled devices treat all physical links (ports) in an aggregation group entirely as a single logical link
(port). Member ports in an aggregation group share egress/ingress traffic load, delivering a bandwidth that is
multiple of a single physical link. Link aggregation provides redundancy in case one of the links fails, thus
reliability could be maintained. For example, if any port/link within the aggregation group becomes disconnected,
packets intended for such port/link will be redirected to the other linked ports of the link aggregation group.
2. Port configuration considerations in link aggregation
(1)To share egress/ingress traffic load, member ports in an aggregation group must be set to the same
configurations with respect to STP, QoS, VLAN, port attributes, etc.
Consistent STP Configurations: Includes state of port-level STP (enabled or disabled), type of the link
(point-to-point or otherwise) connected to the port, STP cost, STP priority, loop/root protection (enabled or disabled)
and port type (whether the port is an edge port), etc.
Consistent QoS Configurations: Includes rate limit, DSCP/802.1p priority.
Consistent VLAN Configurations: Includes VLANs permitted on the port and default VLAN ID on the port.
(2) When connecting switches using trunk feature, ensure uplink ports of partner switch are in an identical Trunk
group. In other words, inter-switch multi-port (Trunk members) uplink must be implemented using the
Trunk-to-Trunk scheme.
(3) Never connect 2 Trunk groups of a switch or uplink 2 switches through 2 groups of Trunk paths. Otherwise, it
may cause network loop, broadcast storm and even collapse the whole network.
(4) The switch supports up to 3 aggregation groups which can only apply to ports 1-4, ports 5-8 and ports 25-26.
Aggregation group 1 and aggregation group 2 can include up to 4 member ports and a minimum of 2 member ports.
Aggregation group 3 can only include port 25 and port 26. Aggregation ports are not recommended for other
configurations and use.
3. Link Aggregation Configurations
Click
Port Management > Link Aggregation
to enter the screen below.
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