Networking - [MST] - Multiple Spanning Tree {CCIE} _ Lang: In Hindi

Multiple Spanning Tree (MST) ----------------------------------------------------------------------------------------------------------- MST works with the concept of regions. Switches that are configured to use MST need to find out if their neighbors are running MST. MST Region A Region B When switches have the same attributes they will be in the same region. It’s possible to have one or more regions and here are the attributes that need to match: MST configuration name. MST configuration revision number. MST instance to VLAN mapping table. When switches have the same attributes configured they will be in the same region. If the attributes are not the same the switch is seen as being at the boundary of the region. It can be connected to another MST region but also talk to a switch running another version of spanning tree. The MST configuration name is just something you can make up, it’s used to identify the MST region. The MST configuration revision number is also something you can make up and the idea behind this number is that you can change the number whenever you change your configuration. It doesn’t matter what you pick as long as it’s the same on all switches within the MST region. VLANs will be mapped to an instance by using the MST instance to VLAN mapping table. This is something we have to do ourselves. Within the MST region we will have one instance of spanning tree that will create a loop free topology within the region. When you configure MST there is always one default instance used to calculate the topology within the region. We call this the IST (Internal Spanning Tree). By default Cisco will use instance 0 to run the IST. In case you were wondering…its rapid spanning tree that we run within the MST.