D-Link DGS-6600-48TS Configuration Guide - Page 143
Specifying the MST Configuration ID, Specifying the MSTP Timer
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Volume 3-Layer 2 Configurations / Chapter 14-Spanning Tree Protocol (STP) Configuration STP Configuration Commands • Displaying and Verifying MSTP Protocol Operations Specifying the MST Configuration ID The MST Configuration ID is conveyed in the BPDU. The local bridge and the neighbor bridge must have the same configuration ID for them to be in the same MST region. The MST Configuration ID is comprised of the region name, the revision level, and the digest of the VLAN to MSTI mapping table. An MSTI is identified by the Tree ID. MSTI 0 is also the IST. By default, all VLANs are mapped to the IST. The user should re-map VLAN to other MSTIs. All the unmapped VLANs are mapped to an IST. The recommendation is that all VLANs are mapped to other MSTIs. If mapped to an IST, VLAN traffic may be blocked on some ports in certain conditions if their is an error with the STP configuration. Use the following commands to specify the Configuration ID for an MST: Command spanning-tree mst configuration instance INSTANCE-ID vlan VLAN-ID [,|-] name NAME revision VERSION show spanning-tree mst configuration Explanation Enters MST configuration mode. Specifies the VLAN or set of VLANs that should be mapped to an MST instance. Specifies a name for the MST region. Specifies a revision number for the MST configuration. Displays the MST configuration. In the following example, the user specifies that the Switch will use MSTP, configures a new MSTP instance numbered 1, names the new instance "Corp-STP", assigns a revision number of 1, and verifies the settings: DGS-6600:2>enable DGS-6600:15#configure terminal DGS-6600:15(config)#spanning-tree mode mstp DGS-6600:15(config)#spanning-tree mst configuration DGS-6600:15(config-mst)#instance 1 vlan 300-304 DGS-6600:15(config-mst)#name Corp-STP DGS-6600:15(config-mst)#revision 1 DGS-6600:15(config-mst)#end DGS-6600:15#show spanning-tree mst configuration Name : Corp-STP Revision : 1 Instance Vlans mapped 0 1-299,305-4094 1 300-304 Total Entries:2 DGS-6600:15# Specifying the MSTP Timer The user can specify the timers used for the forward delay, maximum age, and maximum number of hops for the MSTP state machine computation. DGS-6600 Configuration Guide 143