User manual

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ES-2000 Series
8 SPANNING TREE ALGORITHM
This chapter describes the following basic topics:
◆ Global Settings for STA – Configures global bridge settings for STP,
RSTP and MSTP.
◆ Interface Settings for STA – Configures interface settings for STA,
including priority, path cost, link type, and designation as an edge port.
OVERVIEW
The Spanning Tree Algorithm (STA) can be used to detect and disable
network loops, and to provide backup links between switches, bridges or
routers. This allows the switch to interact with other bridging devices (that
is, an STA-compliant switch, bridge or router) in your network to ensure
that only one route exists between any two stations on the network, and
provide backup links which automatically take over when a primary link
goes down.
The spanning tree algorithms supported by this switch include these
versions:
◆ STP – Spanning Tree Protocol (IEEE 802.1D)
◆ RSTP – Rapid Spanning Tree Protocol (IEEE 802.1w)
STP – STP uses a distributed algorithm to select a bridging device (STP-
compliant switch, bridge or router) that serves as the root of the spanning
tree network. It selects a root port on each bridging device (except for the
root device) which incurs the lowest path cost when forwarding a packet
from that device to the root device. Then it selects a designated bridging
device from each LAN which incurs the lowest path cost when forwarding a
packet from that LAN to the root device. All ports connected to designated
bridging devices are assigned as designated ports. After determining the
lowest cost spanning tree, it enables all root ports and designated ports,
and disables all other ports. Network packets are therefore only forwarded
between root ports and designated ports, eliminating any possible network
loops.