D-Link DGS-3312SR [83/290] Spanning tree
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D-Link DGS-3312SR [83/290] Spanning tree

D-Link DGS-3312SR [83/290] Spanning tree
DGS-3312SR Stackable Gigabit Layer 3 Switch
Spanning Tree
This Switch supports three versions of the Spanning Tree Protocol; 802.1d STP, 802.1w Rapid STP and 802.1s MSTP.
802.1d STP will be familiar to most networking professionals. However, since 802.1w RSTP and 802.1s MSTP has been
recently introduced to D-Link managed Ethernet switches, a brief introduction to the technology is provided below
followed by a description of how to set up 802.1d STP, 802.1w RSTP and 802.1s MSTP.
802.1s MSTP
Multiple Spanning Tree Prot t allows multiple VLANs to
ll provide multiple pathways across the network. Therefore, these
ting wide scale disruptions when a single spanning tree instance
s of new topologies for the failed instance. Frames designated for these VLANs
hroughout interconnected bridges utilizing either of the three spanning tree
M
This protocol will also tag
regions and the VLANs as ssified by an MSTI ID. MSTP will connect
multiple spanning trees with a Common and Internal Spanning Tree (CIST). The CIST will automatically determine each
maximu
Consequentially, frames ass will follow different data routes within administratively established
regions on the network, continuing to allow simple and full processing of frames, regardless of administrative errors in
LANs and their r
Each switch utilizing the M
attributes:
1. A configuration name defined by an alphanumeric string of up to 32 characters (defined in the MST
onfiguration Ta
2. A configuration revision number (named here as a Revision Level and found in the MST Configuration Table
sible 4094 VLANs supported by the Switch for a given instance.
To utilize the MSTP function on the Switch, three steps need be taken:
1. The Switch must be set l Settings window in the STP
for the MSTP instance must be entered (defined here as a Priority in the MST
en configuring an MSTI ID settings).
LANs that will b in the MST
Table window when configuring an MSTI ID settings).
802.1w Rapid Spann
ts thr
defined by the IEEE 802.1s .1w specification and a
STP. RSTP can operate with legacy equipment implementing IEEE 802.1d,
l be lost.
recent switching innovations, in particular,
certain Layer 3 functions that are increasingly handled by Ethernet switches. The basic function and much of the
terminology is the same as STP. Most of the settings configured for STP are also used for RSTP. This section introduces
some new Spanning Tree concepts and illustrates the main differences between the two protocols.
Port Transition States
An essential difference between the three protocols is in the way ports transition to a forwarding state and in the way this
transition relates to the role of the port (forwarding or not forwarding) in the topology. MSTP and RSTP combine the
ocol, or MSTP, is a standard defined by the IEEE community tha
be mapped to a single spanning tree instance, which wi
MSTP configurations will balance the traffic load, preven
fails. This will allow for faster convergence
will be processed quickly and completely t
protocols (STP, RSTP or STP).
BDPU packets so receiving devices can distinguish spanning tree instances, spanning tree
sociated with them. These instances will be cla
MSTP region, its m possible extent and will appear as one virtual bridge that runs a single spanning tree.
igned to different VLANs
defining V espective spanning trees.
STP on a network will have a single MSTP configuration that will have the following three
C ble window in the Configuration Name field).
window) and;
3. A 4094 element table (defined here as a VID List in the MST Configuration Table window) which will
associate each of the pos
to
to the MSTP setting (found in the STP Bridge Globa
Version field)
2. The correct spanning tree priority
Configuration Table window wh
3. V
Configuration
e shared must be added to the MSTP Instance ID (defined here as a VID List
ing Tree
The Switch implemen ee versions of the Spanning Tree Protocol, the Multiple Spanning Tree Protocol (MSTP) as
, the Rapid Spanning Tree Protocol (RSTP) as defined by the IEEE 802
version compatible with the IEEE 802.1d
however the advantages of using RSTP wil
The IEEE 802.1w Rapid Spanning Tree Protocol (RSTP) evolved from the 802.1d STP standard. RSTP was developed in
order to overcome some limitations of STP that impede the function of some
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