4000 Router Series Layer 2 - LAN Switching Configuration Guide

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NOTE:

• In STP or RSTP mode, do not specify an MSTI. Otherwise, the spannin

tree confi

uration does not

take effect.

• In MSTP mode, if you specify an MSTI, the spannin

tree confi

uration takes effect on the specified

MSTI. If you do not specify an MSTI, the spanning tree configuration takes effect on the CIST.

Configuring an MST region

Two or more spanning tree devices belong to the same MST region only if they are configured to have the

same format selector (0 by default, not configurable), MST region name, MST region revision level, and

the same VLAN-to-instance mapping entries in the MST region, and they are connected through a

physical link.

The configuration of MST region-related parameters (especially the VLAN-to-instance mapping table)

might cause MSTP to begin a new spanning tree calculation. To reduce the possibility of topology

instability, the MST region configuration takes effect only after you activate it by using the active

region-configuration command, or enable a spanning tree protocol by using the stp global enable

command if the spanning tree protocol is disabled.

To configure an MST region:

Step Command Remarks

1. Enter system view.

system-view N/A

2. Enter MST region view.

stp region-configuration N/A

3. Configure the MST region

name.

region-name name

The default setting is the MAC

address.

4. Configure the

VLAN-to-instance mapping

table.

• instance instance-id vlan

vlan-list

• vlan-mapping modulo modulo

Use one of the commands.

By default, all VLANs in an MST

region are mapped to the CIST (or

MSTI 0).

5. Configure the MSTP revision

level of the MST region.

revision-level level The default setting is 0.

6. (Optional.) Display the MST

region configurations that are

not activated yet.

check region-configuration N/A

7. Manually activate MST region

configuration.

active region-configuration N/A

8. (Optional.) Display the

activated configuration

information of the MST

region.

display stp region-configuration Available in any view.