SNR S2989G-48TX-DC [402/553] Mstp configuration task list

S2989G-24TX Operation Manual

Chapter 7 Reliability Configuration

7-3

establishes and maintains the CST, which includes all MST regions and all legacy STP

bridges in the network. The MST instances combine with the IST at the boundary of the

region to become the CST.

The MSTI is only valid within its MST region. An MSTI has nothing to do with MSTIs in

other MST regions. The bridges in a MST region receive the MST BPDU of other regions

through Boundary Ports. They only process CIST related information and abandon MSTI

information.

Port Roles

The MSTP bridge assigns a port role to each port which runs MSTP.

 CIST port roles: Root Port, Designated Port, Alternate Port and Backup Port

 On top of those roles, each MSTI port has one new role: Master Port.

The port roles in the CIST (Root Port, Designated Port, Alternate Port and Backup

Port) are defined in the same ways as those in the RSTP.

MSTP Load Balance

In a MSTP region, VLANs can by mapped to various instances. That can form various

topologies. Each instance is independent from the others and each distance can have its

own attributes such as bridge priority and port cost etc. Consequently, the VLANs in

different instances have their own paths. The traffic of the VLANs are load-balanced.

MSTP Configuration Task List

MSTP configuration task list:

1. Enable the MSTP and set the running mode

2. Configure instance parameters

3. Configure MSTP region parameters

4. Configure MSTP time parameters

5. Configure the fast migrate feature for MSTP

6. Configure the format of port packet

7. Configure the spanning-tree attribute of port

8. Configure the snooping attribute of authentication key

9. Configure the FLUSH mode once topology changes

1. Enable MSTP and set the running mode

Command

Explanation

Global Mode and Port Mode