Procedure
Step 1 Run:
system-view
The system view is displayed.
Step 2 Run:
stp region-configuration
The MST region view is displayed.
Step 3 Run:
instance instance-id vlan { vlan-id [ to vlan-id ] } &<1-10>
Mappings between protected instances and VLANs are configured.
The value of instance-id specified in this command must be the same as that of instance-id
specified in the protected-instance command.
Before you switch a VLAN from one SEP segment to another segment, shut down the blocked
port. If you do not shut down the blocked port, a routing loop may occur after the VLAN
switchover.
Step 4 Run:
active region-configuration
Mappings between protected instances and VLANs are activated.
After mappings between protected instances and VLANs take effect, topology changes of a SEP
segment affect only corresponding VLANs. This ensures reliable service data transmission.
----End
8.5.4 Configuring the Topology Change Notification Function
The topology change notification function is configured on the device that connects a lower-
layer network to an upper-layer network. This function enables the device to notify the peer
device of topology changes in the lower-layer and upper-layer networks. All the devices on the
network where the peer device resides then delete original MAC addresses and ARP entries and
learn new MAC addresses to ensure uninterrupted traffic forwarding.
8.5.4.1 Reporting Topology Changes in a Lower-Layer Network - SEP Topology
Change Notification
Context
SEP runs on devices at the access layer. The topology change notification function enables
devices to detect topology changes on the upper and lower-layer networks.
If the upper-layer network fails to be notified of the topology change in a SEP segment, the MAC
address entries remain unchanged on the upper layer network and user traffic may be interrupted.
To ensure uninterrupted traffic forwarding, configure devices on the lower-layer network to
report topology changes to the upper-layer network and specify the devices on the upper-layer
network that will be notified of topology changes.
Huawei AR530&AR550 Series Industrial Switch Routers
Configuration Guide - Ethernet Switching
8 SEP Configuration
Issue 01 (2014-11-30) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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