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xStack DES-3800 Series Layer 3 Stackable Fast Ethernet Managed Switch
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Figure 7- 29. MLD Static Router Port Settings Window
To configure the router ports settings for a specified VLAN, click its corresponding
button, which will produce the
following window for the user to configure.
Figure 7- 30. MLD Snooping Static Router Port Settings- Edit window
The following parameters are displayed:
Parameter Description
VID (VLAN ID)
This is the VLAN ID that, along with the VLAN Name, identifies the VLAN where the MLD
multicast router is attached.
VLAN Name
This is the name of the VLAN where the MLD multicast router is attached.
Tick the port numbers that are connected to multicast enabled routers and click Apply to implement the changes made. Click the
Show All Snooping Static Router Port Entries
link to return to the MLD Snooping Settings 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 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 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 any of the three spanning tree protocols (STP, RSTP or
MSTP).
This protocol will also tag BPDU packets so receiving devices can distinguish spanning tree instances, spanning tree regions and
the VLANs associated with them. An MSTI ID will classify these instances. 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.