SMC Networks 8648T - annexe 1, Management Manual

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C
ONFIGURING THE
S
WITCH
3-116
Spanning Tree Algorithm Configuration
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)
• MSTP – Multiple Spanning Tree Protocol (IEEE 802.1s)
STA uses a distributed algorithm to select a bridging device
(STA-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. 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.
It then selects a port on the designated bridging device to communicate
with each attached LAN or host device as a designated port. 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.