D-Link DWS-1008 Product Manual - Page 221
Configuring and Managing Spanning Tree Protocol, Enabling the Spanning Tree Protocol
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Configuring and Managing Spanning Tree Protocol The purpose of the Spanning Tree Protocol (STP) is to maintain a loop-free network. A loop-free path is accomplished when a device recognizes a loop in the topology and blocks one or more redundant paths. Mobility System Software (MSS) supports 802.1D and Per-VLAN Spanning Tree protocol (PVST+). • MSS uses 802.1D bridge protocol data units (BPDUs) on VLAN ports that are untagged. However, each VLAN still runs its own instance of STP, even if two or more VLANs contain untagged ports. To run a single instance of STP in 802.1D mode on the entire switch, configure all network ports as untagged members of the same VLAN. MSS does not support running 802.1D on multiple tagged VLANs. • MSS uses PVST+ BPDUs on VLAN ports that are tagged. PVST+ BPDUs include tag information in the 802.1Q field of the BPDUs. MSS runs a separate instance of PVST+ on each tagged VLAN. Note: STP does not run on AP access ports or wired authentication ports and does not affect traffic flow on these port types. Note: When you create a VLAN, STP is disabled on the new VLAN by default, regardless of the STP state of other VLANs on the device. Note: The IEEE 802.1D spanning tree specifications refer to networking devices that forward Layer 2 traffic as bridges. In this context, a switch is a bridge. Where this manual or the product interface uses the term bridge, you can assume the term is applicable to the switch. Enabling the Spanning Tree Protocol STP is disabled by default. You can enable STP globally or on individual VLANs. To enable STP, use the following command: set spantree {enable | disable} [{all | vlan vlan-id | port port-list vlan-id}] To enable STP on all VLANs configured on a switch, type the following command: DWS-1008# set spantree enable success: change accepted. To verify the STP state and display the STP parameter settings, enter the show spantree command. D-Link DWS-1008 User Manual 202
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