NetComm NP2624M - Manual (Page 121)

NP2624M User Guide 121
YML827 Rev1
5.4.3 Issue on Trunk and Stacking mode
There are Two basic rules here:
1. Stacking members cannot and should not truck each other.
2. Stacking members can trunk with non-stacking members.
The packet traffic between stacking members are transferred only through Giga module. Trunking
between stacking members may cause the spanning tree protocol (STP) to alter the topology and
change the routed ports. If this happens, Giga port traffic may break and the stacking mechanism
will fail.
For non-stacking member, there is no such limitation.