Publication date: Sept, 2015
Revision A1
100
2-‐8
Spanning Tree
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 that 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) that 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 that 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.
2-‐8.1 Bridge Setting
The section describes how to configure the Spanning Tree Bridge and STP System settings. It allows
you to configure STP System settings are used by all STP Bridges in the switch.
Web Interface
To configure the Spanning Tree Bridge Settings parameters in the web interface:
1.
Click Configuration, Spanning Tree, Bridge Settings.
2.
Scroll to select the parameters and write down available value of parameters in blank field in Basic
Settings.
3.
Enable or disable the parameters and write down the available value of parameters in blank field in
Advanced settings.
4.
Click Apply to save the setting.
5.
If you want to cancel the setting, click the Reset button. It will revert to previously saved values.
Summary of Contents for LPB2910A
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Page 65: ...Publication date Sept 2015 Revision A1 53 SMTP Enable Select this Group Name in SMTP ...
Page 69: ...Publication date Sept 2015 Revision A1 57 The number of data to be saved in the RMON ...
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Page 278: ...Publication date Sept 2015 Revision A1 266 Refresh Click to refresh the page ...
Page 365: ...Page 353 Figure 9 21 Restore Configuration option ...