A10E/A28E/A28F Configuration Guide
7.4 STP
7.4.1 Introduction
STP
With the increasing complexity of network structure and growing number of switches in the
network, the Ethernet network loops become the most prominent problem. Because of the
packet broadcast mechanism, network loop will make the network generate network storm,
exhaust network resources, and have serious impact to the normal data forwarding. The
network storm caused by network loops is shown as below.
Figure 7-7 Network storm due to loopback
Spanning Tree Protocol (STP) is compliant to IEEE 802.1d standard and used to remove data
physical loop in data link layer in LAN.
The A10E/A28E running STP can process Bridge Protocol Data Unit (BPDU) packet with
each other for the election of root switch and selection of root port and designated port. It also
can block loop interface on the A10E/A28E logically according to the selection results,
eventually trimming the loop network structure to tree network structure without loop which
takes a A10E/A28E as root, so as to prevent the continuous proliferation and limitless
circulation of packet in loop network from causing broadcast storm and avoid declining
packet processing capacity caused by receiving the same packets repeatedly.
The loop network diagram running STP is shown as below.
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