XGS-5240-Series User Manual

Configuration Guide of XGS-5240-Series
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properties as follows:
 All ports are in full-duplex mode.
 All Ports are of the same speed.
 All ports are Access ports and belong to the same VLAN or are all TRUNK ports, or are all
Hybrid ports.
 If the ports are all TRUNK ports or Hybrid ports, then their “Allowed VLAN” and “Native
VLAN” property should also be the same.
If Port Channel is configured manually or dynamically on switch, the system will
automatically set the port with the smallest number to be Master Port of the Port Channel. If
the spanning tree function is enabled in the switch, the spanning tree protocol will regard Port
Channel as a logical port and send BPDU frames via the master port.
Port aggregation is closely related with switch hardware. Switch allow physical port
aggregation of any two switches, maximum 128 groups and 8 ports in each port group are
supported.
Once ports are aggregated, they can be used as a normal port. Switch have a built-in
aggregation interface configuration mode, the user can perform related configuration in this
mode just like in the VLAN and physical interface configuration mode.
14.2 Brief Introduction to LACP
LACP (Link Aggregation Control Protocol) is a kind of protocol based on IEEE802.3ad
standard to implement the link dynamic aggregation. LACP protocol uses LACPDU (Link
Aggregation Control Protocol Data Unit) to exchange the information with the other end.
After LACP protocol of the port is enabled, this port will send LACPDU to the other end to
notify the system priority, the MAC address of the system, the priority of the port, the port ID
and the operation Key. After the other end receives the information, the information is
compared with the saving information of other ports to select the port which can be aggregated,
accordingly, both sides can reach an agreement about the ports join or exit the dynamic
aggregation group.
The operation Key is created by LACP protocol according to the combination of
configuration (speed, duplex, basic configuration, management Key) of the ports to be
aggregated.
After the dynamic aggregation port enables LACP protocol, the management Key is 0 by
default. After the static aggregation port enables LACP, the management Key of the port is the
same with the ID of the aggregation group.
For the dynamic aggregation group, the members of the same group have the same
operation Key, for the static aggregation group, the ports of Active have the same operation
Key.