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Services Were Affected Due to Incorrect MSTP Configurations After Third-party Core Switches Were Replaced by NE40Es

Publication Date:  2013-10-08 Views:  124 Downloads:  0

Issue Description


Two third-party core switches (core switch 1 and core switch 2) on a DCN were replaced by NE40Es running V600R003SPC011. When services were tested after a cutover was completed, short message and NMS services were interrupted upon the disabling of the customer service.

Handling Process

Huawei checked the MSTP configurations of each service.

The short message service with VLAN32 and NMS service with VLAN59 were bound with instance 0, and the customer service with VLAN32 was bound with instance 1.

When the customer service was disabled, the topology of instance 0 changed and MSTP re-calculation occurred. As a result, the MAC address table was cleared and ARP entries were updated.

Root Cause

A link change in non-instance 0 affected services in instance 0.


Put the short message service and NMS service into another instance by issuing:

instance 1 vlan 33 ......

instance 2 vlan 32 59 ......


A link change in non-instance 0 causes topology re-calculation, clearing of the MAC address table, and an ARP entry update for instance 0. Do not bind service VLANs to instance 0.