Configure Multi-Spanning Tree (MSTP) with Cisco GNS3

First of all, you must understand the concept of mstp. . .

IEEE 802. 1Q not only defines Trunk, but also defines the disadvantage of CST (common spanning tree): all Vlan work according to the same STP. Advantages: low cost.

MST (compromise between CST and PVST)

1.MST group vlan (example)

2. Each packet can have an independent STP to realize L2 load sharing.

Sw 1 (Configuration) # Spanning Tree Mode MST (MST Enabled)

Sw 1 (Configuration) # Spanning Tree mst Configuration

SW1(config-MST) # instance1VLAN1-5 (VLAN1-5 * * only one).

Sw 1 (configure MST) # Instance2VLAN 6-10 (VLAN 6-10 * * Enjoy STP).

Sw 1 (Configuration) # Spanning Tree MST 1 Priority 4096 Modify the priority of this switch in this large number of VLAN.

Sw 1 (config-if) # Spanning Tree MST 1cost 19 Modify the cost of this interface in this group.

SW 1 # shows the spanning tree mst.

SW 1 # shows the mst configuration of spanning tree.