Spanning Tree - Bridge Settings - Draytek VigorSwitch P2261 User Manual

Refresh
After finished the above settings, click Apply to save the configuration. The settings will
take effect.
2 . 3 . 5 S p a n n i n
2 . 3 . 5 S p a n n i n
The Spanning Tree Protocol (STP) 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 STP-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.
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.
Once a stable network topology has been established, all bridges listen for Hello BPDUs
(Bridge Protocol Data Units) transmitted from the Root Bridge. If a bridge does not get a
Hello BPDU after a predefined interval (Maximum Age), the bridge assumes that the link
to the Root Bridge is down. This bridge will then initiate negotiations with other bridges to
reconfigure the network to reestablish a valid network topology.
Function name:
Spanning Tree – Bridge Settings
Function description:
The function is used to configure the Spanning Tree Bridge and STP System settings. It
allows you to configure STP System settings are used by all STP Bridge instance in the
Switch Stack.
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The simple counts will be refreshed manually when user use
mouse to click on "Refresh" button.
g T r e e – B r i d g e S
g T r e e – B r i d g e S
e t t i n g s
e t t i n g s
VigorSwitch P2261 User's Guide