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Araknis Networks AN-210/310-SW-F/R Manual
Product Manual
Table of Contents
7 - STP – Overview
The Spanning Tree Protocol (STP) is a Layer 2 protocol primarily used to detect and eliminate network loops
on redundant connections. Proper STP configuration ensures that only one route exists between any two
end devices, with backup routes automatically taking over if a primary route goes down.
STP – Global Settings
Use this page to enable STP, select which protocol is used, and configure settings for the switch used to
elect the root bridge device.
Figure 16.
Global STP Settings Menu
Settings
•
STP State –
Select whether Spanning Tree Protocol is Enabled or Disabled.
•
Force Version –
Select the spanning tree protocol to enforce:
•
STP –
Spanning Tree Protocol (IEEE 802.1D). Uses a distributed algorithm to select a switch to serve
as the root of the spanning tree network. It selects a root port on each switch (except for the root
device), which has the lowest path cost forwarding a packet to the root device. All ports connected
to designated bridging devices are assigned as designated ports. After determining the lowest cost
path, STP enables all root ports and designated ports, and disables all other ports to prevent loops.
Network packets are then only forwarded between root ports and designated ports.
Once the network is stable, all switches listen for Hello BPDUs (Bridge Protocol Data Units) sent by
the Root Bridge. If a switch does not get a Hello BPDU after a certain period (Maximum Age), the
switch assumes that the link to the Root Bridge is down. Then, the switch initiates negotiations with
other switches in the network to recalculate the Spanning Tree Algorithm, determine the new root
bridge device, and make the network stable again.
•
RSTP –
Rapid Spanning Tree Protocol (IEEE 802.1w). Enhancement to legacy STP. RSTP is also
included in MSTP. RSTP performs faster reconfiguration when topology change is detected (1 to 3
seconds for RSTP, compared to 30 seconds or more for STP). RSTP only supports one spanning
tree instance on any link in a network. We recommend using RSTP over STP as long as the network
equipment supports it.
•
MSTP –
Multiple Spanning Tree Protocol (IEEE 802.1s). Designed to maintain multiple spanning
trees instances based on VLANs in the network. One or more VLANs can be grouped into a Multiple
Spanning Tree Instance (MSTI). Use this mode when there multiple spanning tree regions with their
own regional root bridge devices.
•
Configuration Name –
(MSTP mode only) Name the MSTP configuration.
Default: MAC address of the switch
•
Configuration Revision –
(MSTP mode only) Set a configuration revision for MSTP. The revision number
must be the same for switches in the same region. Use a different revision for each region.
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