DGS-3024 Gigabit Ethernet Switch Manual
Click Apply to implement the new settings, Click the Show All Static Router Port Entries link to return to the Current Static Router Port Entries window.
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
802.1s MSTP
Multiple Spanning Tree Protocol, or MSTP, is a standard defined by the IEEE community that allows multiple VLANs to be mapped to a single spanning tree instance, which will provide multiple pathways across the network. Therefore, these MSTP configurations will balance the traffic load, preventing wide scale disruptions when a single spanning tree instance fails. This will allow for faster convergences of new topologies for the failed instance. Frames designated for these VLANs will be processed quickly and completely throughout interconnected bridges utilizing either of the three spanning tree protocols (STP, RSTP or MSTP).
This protocol will also tag BDPU packets so receiving devices can distinguish spanning tree instances, spanning tree regions and the VLANs associated with them. These instances will be classified by an MSTI ID. MSTP will connect multiple spanning trees with a Common and Internal Spanning Tree (CIST). The CIST will automatically determine each MSTP region, its maximum possible extent and will appear as one virtual bridge that runs a single spanning tree. Consequentially, frames assigned to different VLANs 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 defining VLANs and their respective spanning trees.
Each Switch utilizing the MSTP on a network will have a single MSTP configuration that will have the following three attributes:
1.A configuration name defined by an alphanumeric string of up to 32 characters (defined in the Current MST Configuration Identification window in the Configuration Name field).
2.A configuration revision number (named here as a Revision Level
3.A
To utilize the MSTP function on the Switch, three steps need to be taken:
1.The Switch must be set to MSTP (found in the STP Bridge Global Settings window in the STP Version field)
2.The correct spanning tree priority for the MSTP instance must be entered (defined here as a Priority in the STP Instance Table window when configuring the settings for an MSTI ID).
3.VLANs that will be shared must be added to the MSTP Instance ID (defined here as a VID List in the Current MST Configuration Identification window when configuring the settings for an MSTI ID).
802.1w Rapid Spanning Tree
The Switch implements three versions of the Spanning Tree Protocol, the Multiple Spanning Tree Protocol (MSTP) as defined by the IEEE 802.1s, the Rapid Spanning Tree Protocol (RSTP) as defined by the IEEE 802.1w specification and a version compatible with the IEEE 802.1d STP. RSTP can operate with legacy equipment implementing IEEE 802.1d, however the advantages of using RSTP will be lost.
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 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.
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