the default setting is 128.The lower number has the highest priority.

Path Cost: Specifies the path cost of the port. The switch uses this parameter to help determine which port will become a forwarding port. Lower numbers will be used as forwarding ports first. The range is from 0 to 65535. The default values based on IEEE802.1D are: 10Mb/s = 50-600, 100Mb/s = 10-60, 1000Mb/s = 3-10

4.6.3 Link Aggregation

The Link Aggregation Control Protocol (LACP) provides a standardized means for exchanging information between Partner Systems that require high speed redundant links. Link aggregation lets you group up to eight consecutive ports into a single dedicated connection. This feature can expand bandwidth to a device on the network. LACP operation requires full-duplex mode, more detail information refer to the IEEE 802.3ad standard.

Port link aggregations can be used to increase the bandwidth of a network connection or to ensure fault recovery. Link aggregation lets you group up to 4 consecutive ports into a single dedicated connection between any two the Switch or other Layer 2 switches. However, before making any physical connections between devices, use the Link aggregation Configuration menu to specify the link aggregation on the devices at both ends. When using a port link aggregation, note that:

。The ports used in a link aggregation must all be of the same media type (RJ-45, 100 Mbps fiber).

。The ports that can be assigned to the same link aggregation have certain other restrictions (see below).

。Ports can only be assigned to one link aggregation.

。The ports at both ends of a connection must be configured as link aggregation ports.

。None of the ports in a link aggregation can be configured as a mirror source port or a mirror target port.

。All of the ports in a link aggregation have to be treated as a whole when moved from/to, added or deleted from a VLAN.

。The Spanning Tree Protocol will treat all the ports in a link aggregation as a whole.

。Enable the link aggregation prior to connecting any cable between the switches to avoid creating a data loop.

。Disconnect all link aggregation port cables or disable the link aggregation ports before removing a port link aggregation to avoid creating a data loop.