PLANET XGS3-24040 - Manual (Page 106)

Chapter 12 Port Channel Configuration
12-3
12.2.2 Dynamic LACP Aggregation
1. The summary of the dynamic LACP aggregation
Dynamic LACP aggregation is an aggregation created/deleted by the system automatically, it does not allow
the user to add or delete the member ports of the dynamic LACP aggregation. The ports which have the same
attribute of speed and duplex, are connected to the same device, have the same basic configuration, can be
dynamically aggregated together. Even if only one port can create the dynamic aggregation, that is the single
port aggregation. In the dynamic aggregation, LACP protocol of the port is at the enable state.
2. The port state of the dynamic aggregation group
In dynamic aggregation group, the ports have two states: selected or standby. Both selected ports and
standby ports can receive and send LACP protocol, but standby ports can not forward the data packets.
Because the limitation of the max port number in the aggregation group, if the current number of the member
ports exceeds the limitation of the max port number, then the system of this end will negotiates with the other
end to decide the port state according to the port ID. The negotiation steps are as follows:
Compare ID of the devices (the priority of the system + the MAC address of the system). First, compare the
priority of the systems, if they are same, then compare the MAC address of the systems. The end with a small
device ID has the high priority.
Compare the ID of the ports (the priority of the port + the ID of the port). For each port in the side of the device
which has the high device priority, first, compare the priority of the ports, if the priorities are same, then
compare the ID of the ports. The port with a small port ID is selected, and the others become the standby
ports.
In an aggregation group, the port which has the smallest port ID and is at the selected state will be the master
port, the other ports at the selected state will be the member port.
12.3 Port Channel Configuration Task List
1. Create a port group in Global Mode.
2. Add ports to the specified group from the Port Mode of respective ports.
3. Enter port-channel configuration mode.
4. Set load-balance method for Port-group
5. Set the system priority of LACP protocol
6. Set the port priority of the current port in LACP protocol
1. Creating a port group
Command Explanation
Global Mode
port-group
no port-group
Creates or deletes a port group.