HP 6125G HP 6125G & 6125G/XG Blade Switches Layer 2 - LAN Switching Co - Page 41

Aggregation mode Dynamic LACP status on member ports Pros Cons Enabled The administrator does not need to maintain link aggregations. The peer systems maintain the aggregation state of the member ports automatically. Aggregation is unstable. The aggregation state of the member ports is susceptible to network changes. The following points apply to a dynamic link aggregation group: • A Selected port can receive and send LACPDUs. • An Unselected port can receive and send LACPDUs only if it is up and has the same class-two configurations as the aggregate interface. Aggregating links in static mode LACP is disabled on the member ports in a static aggregation group. You must manually maintain the aggregation state of the member ports. The static link aggregation process comprises: • Selecting a reference port • Setting the aggregation state of each member port Selecting a reference port The system selects a reference port from the member ports that are: • Are in the up state and have • Have the same class-two configurations as the aggregate interface. The candidate ports are sorted by aggregation priority, duplex, and speed in the following order: • Lowest aggregation priority value • Full duplex/high speed • Full duplex/low speed • Half duplex/high speed • Half duplex/low speed The one at the top is selected as the reference port. If two ports have the same aggregation priority, duplex mode, and speed, the one with the lower port number wins. Setting the aggregation state of each member port After selecting the reference port, the static aggregation group sets the aggregation state of each member port, as shown in Figure 6. After the static aggregation group has reached the limit on Selected ports, any port assigned to the group is placed in Unselected state to avoid traffic interruption on the current Selected ports. 32