PowerFlex
8/24/48 Port GbE PoE Managed Switch User’s Guide
4.5
Spanning Tree
Use the Spanning Tree Protocol (STP) to detect and disable network loops, and to provide backup links
between switches, bridges, or routers. This enables the switch to interact with other bridging devices
(that is, an STP-compliant switch, bridge, or router) in the 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. The designated
bridging devices assign all connected ports 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.
After establishing a stable network topology, 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.
4.5.1
Bridge Settings
The section describes how to configure the Spanning Tree Bridge and STP System settings. It enables
configuring STP System settings used by all STP Bridge instances in the Switch Stack.
To configure the Spanning Tree Bridge Settings parameters via the web interface:
1. Navigate to
Configuration
>
Spanning
Tree
>
Bridge Settings
.
2. Use the drop-down menus to select the parameters and specify other values in the Basic Settings.
3. Specify parameters in the Advanced settings.
4. Click
Apply
or click
Reset
if to want to revert to previously saved values.
0.
Toll Free 1-866-
ALLWORX • 585
-421-
3850 •
www.allworx.com
Revised: October 30, 2013
Page
51
Summary of Contents for PowerFlex P810
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