Cisco Systems TEG-S2500i manual Limitation with Trunking in Stacking mode

5.4.3Limitation with Trunking in Stacking mode

Two basic rules declare here:

1.Stacking members can’t and trunk with each other.

2.Stacking members can trunk with non-stacking member.

The packet traffics 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 it happens, Giga port traffic may break and the stacking mechanism will fail.

For non-stacking member, it has no such limitation.

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