Dell PowerConnect FCS624S Configuration Guide - Page 460

12 Dynamic link aggregation FIGURE 84 Ports with the same key in different aggregate links All these ports have the same key, but are in two separate aggregate links with two other devices. Port1/1 Port1/2 Port1/3 Port1/4 Port1/5 Port1/6 Port1/7 Port1/8 System ID: aaaa.bbbb.cccc Ports 1/1 - 1/8 Key 0 System ID: dddd.eeee.ffff Ports 1/5 - 1/8: Key 4 System ID: 1111.2222.3333 Ports 1/5 - 1/8: Key 69 Notice that the keys between one device and another do not need to match. The only requirement for key matching is that all the ports within an aggregate link on a given device must have the same key. Devices that support multi-slot trunk groups can form multi-slot aggregate links using link aggregation. However, the link aggregation keys for the groups of ports on each module must match. For example, if you want to allow link aggregation to form an aggregate link containing ports 1/1 - 1/4 and 3/5 - 3/8, you must change the link aggregation key on one or both groups of ports so that the key is the same on all eight ports. Figure 85 on page 419 shows an example. 418 PowerConnect B-Series FCX Configuration Guide 53-1002266-01