Dell PowerConnect J-EX4200-24T Software Manual page 814

Dell PowerConnect J-Series Ethernet Switch Complete Software Guide for Junos OS
742
NOTE: If the remote end of the LAG link is a security device, LACP might not
be supported because security devices require a deterministic configuration.
In this case, do not configure LACP. All links in the LAG are permanently
operational unless the switch detects a link failure within the Ethernet physical
layer or data link layers.
Figure 18: Topology for LAGs Connecting a Virtual Chassis Access Switch
to a Virtual Chassis Distribution Switch
Table 105 on page 743 details the topology used in this configuration example.