How to set a GE optical port on the control board (SCUB or SCUN) to an uplink port if upstream transmission is not implemented by the upstream interface board?

To set the port on the control board to the uplink port, run the electro-switch 0 location-0 command.
To set the port on the upstream interface board to the uplink port, run the electro-switch 0 location-1 command.
The Huawei SCUN control board can work with the upstream interface board at the same time. In this case, the SCUN control board equals an upstream board in another upstream interface board slot.


What’s the difference between Huawei S6720-32C-EI-24S-AC and S6720-30C-EI-24S Regarging the specification of ports?

Huawei S6720-32C-SI-AC supports 24*100M/1G/2.5G/5G/10G Base-T Ethernet ports, while Huawei S6720-30C-EI-24S supports 24*10GE SFP+ optical ports.

What Are the Differences Between the E Series, F Series, and S Series LPUs of the S7700&S9700?

Huawei Switch S7700 and Huawei Switch S9700 LPUs are classified into three series: E series, F series, and S series.

The E series is the enhanced series, and supports Multiprotocol Label Switching (MPLS) and extension of routing, ACL, and MAC address entries. The E series consists of the EA, EC, ED, and EE LPUs.

The F series is the ordinary series, and supports MPLS but not extension of MAC address entries. The F series consists of the FA and FC LPUs.

The S series is the standard series and does not support extension of MAC address entries. The S series consists of the SA and SC LPUs. The SA LPUs do not support MPLS, whereas the SC LPUs support MPLS.


A, C, and D in the LPU names indicate the number of MAC address entries supported by the LPUs:

  • A: 32K MAC addresses
  • C: 128K MAC addresses
  • D: 512K MAC addresses

Is There Any Limitation on the Slots of the Main Control Boards and LPUs On Huawei S7700/S9700?

Is There Any Limitation on the Slots of the Main Control Boards and LPUs On Huawei S7700/S9700 Switch?

A main control board can be installed in either of the two slots reserved for the main control board. An LPU can be installed in any slot reserved for LPUs. However, the main control board cannot be installed in the slot reserved for LPU, and the LPU cannot be installed in the slot reserved for the main control board.


What’s the difference between MA5683T and MA5800-X7?

The 40 Gbit/s-capacity Next-Generation Optical Line Terminal. Huawei’s SmartAX MA5800 multiple-service access module employs a distributed architecture to support ultra-broadband, Fixed Mobile Convergence services, and smart capabilities.

This article main talking about the difference between MA5683T & MA5800 X7 .



In addition to the basic performance of different, in the software system operation is also different, the following is the biggest difference.


QinQ l2pt PVST+ failed because of miss-configuration

Issue Description



Huawei S5700 related configuration:
Software Version V200R003C00SPC300
sysname Quidway
vlan batch 166
l2protocol-tunnel eoam3ah group-mac 0100-0ccd-
l2protocol-tunnel gmrp group-mac 0180-e500-0001
l2protocol-tunnel gvrp group-mac 0180-e500-0002
l2protocol-tunnel cdp group-mac 0100-0ccd-cdd0
l2protocol-tunnel dtp group-mac 0100-0ccd-cdd0
l2protocol-tunnel pvst+ group-mac 0100-0ccd-cdd0

interface Vlanif1
ip address
interface GigabitEthernet0/0/1
port link-type trunk
undo port trunk allow-pass vlan 1
port trunk allow-pass vlan 166
stp disable
interface GigabitEthernet0/0/3
port link-type dot1q-tunnel
port default vlan 166
stp disable
l2protocol-tunnel stp cdp pvst+ enable

jumboframe enable 9712

PVST+ packets cannot pass through the tunnel and PVST domain cannot be integrated over Huawei network.

Alarm Information

<Quidway>display l2protocol-tunnel statistics GigabitEthernet 0/0/3
Port            Protocol           Drop      Input       Output    Drop
Threshold     Packets   Packets   Packets
GE0/0/3         stp                   0              6                 0         0
cdp                  0              6                 0         0
pvst+                0              0                 0         0

Statistic show only input packets. PVST+ packets cannot be transmitted properly.

Handling Process

By default, on V200R003 version, the packets with destination MAC address 0100-0ccc-cccc are processed as BPDUs, and packets with destination MAC address 0100-0ccc-cccd are forwarded by the hardware as data.

Because are forward as data packets, it will not be transmitted over layer 2 protocol tunnel. In this case we need to enforce the switch to process DA 0100-0ccc-cccd packets as bpdu and not as data packets.


<HUAWEI> system-view
[HUAWEI] bpdu mac-address 0100-0ccc-cccd


Root Cause

Capturing the packets on Gi0/0/3, relieved that packets are send through the tunnel without changing the destination address.

Since in the switch configuration we add  “l2protocol-tunnel pvst+ group-mac 0100-0ccd-cdd0” command for l2protocol-tunnel group-mac definition, packets entering to the tunnel should have destination address, changed from “0100-0ccc-cccd” (default value) to “0100-0ccd-cdd0”.


Bridge protocol packets belonging to devices from other vendors need to be processed as BPDUs. You can set the MAC address of such packets to the MAC address of BPDUs