2. How to achieve
1) In the MSTP network, the concept of domain is introduced, which is called MST domain
2) Each MST domain contains one or more "spanning trees" called "instances"
3) Each "instance spanning tree" can be bound to vlan to realize load sharing/load balancing of vlan data flow
4) By default, all vlans belong to "instance tree 0: ie: instance 0"
5) Different "instance trees" are different "spanning trees", and each instance tree can elect a root switch
3. Working principle of MSTP
1) MSTP working process:
elect root switch
Election root port-RP
Election Designated Port-DP
Determine Alternate Port - AP
2) Determine the port status:
(Discard): Equivalent to disable, listen, block in STP, do not forward user data
Learning (learning): the same as the learning state in STP
Forwarding: the same as the forwarding state in STP
4. MSTP configuration
Create a vlan for each switch, and configure the interface connected to the switch as a trunk
Configure the STP mode as MSTP
The switch creates the correspondence between MSTP domain name, instance and vlan
Activate MSTP area configuration on the switch
MSTP load balancing:
topology
need
1）PC1属于 vlan 10 ，IP地址为 192.168.10.1/24， 网关为 192.168.10.254
2）PC2属于 vlan 20 ，IP地址为 192.168.20.1/24， 网关为 192.168.20.2