Forwarding traffic with distributed trunking and spanning tree

Refer to Distributed trunking with STP forwarding unicast, broadcast, and multicast traffic for the following discussion about forwarding traffic when spanning tree is enabled. In this example, it is assumed that traffic is sent from a host off switch B to a server, and from the server back to the host. STP can block any one of the upstream links; in this example, STP has blocked all the links except the I1 link connected to DT1.

NOTE:

STP is automatically disabled on the DT ports.

Distributed trunking with STP forwarding unicast, broadcast, and multicast traffic