Can the loop detection and smart link functions be used together on an S series switches


You are not advised to configure both the loop detection and smart link functions on S series (except the S1700) or E series switches.

Other related questions:
Can loopback detection be used together with VLAN-Mapping on interfaces of S series switch
When VLAN-Mapping is configured on interfaces of S series switches (except S1700), only loops in the translated VLAN can be detected, and loops in the original VLAN cannot be detected. The reason is that: When a switch receives a packet, it will replace the VLAN ID carried in the packet with the translated VLAN. If the VLAN configured in loopback detection is the original VLAN, the switch finds that the VLAN where a loop is detected is not the original VLAN and will consider that no loop exists.

How to configure loop detection on multiple ports on S series switches
Huawei S series (except the S1700) and E series switches support MAC address flapping detection, which can detect loops on multiple interfaces. You are advised to configure MAC address flapping detection on downlink interfaces and set the action to be taken after MAC address flapping occurs in alarm-only. If a loop occurs, an alarm will be sent to eSight, facilitating location of other faults. Enable MAC address flapping detection in VLANs. MAC address flapping detection in a maximum of 32 VLANs is supported. [Huawei] vlan 3 [Huawei-vlan3] loop-detect eth-loop block-time 30 retry-times 3 The alarm information consists of the interface name, VLAN ID, flapping time, and MAC address that flaps. Alarms can be generated consecutively. #Jan 1 2008 06:53:12-08:00 Huawei L2IFPPI/4/MFLPIFRESUME:OID1. Loop does not exist in vlan 3, Interface Ethernet0/0/1 resumed, block-time is 30 for mac-flapping disappeared. #Jan 1 2008 06:52:22-08:00 Huawei L2IFPPI/4/MFLPIFBLOCK:OID1. Loop exist in vlan 3, Interface Ethernet0/0/1 blocked, block-time is 30 for mac-flapping, Mac Address is 00e0-fc22-765a.

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