Must the default VLAN ID be configured in the EFM loopback test

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In V100R005, the default VLAN ID must be configured.

In V100R006 and later versions, you can choose not to configure the default VLAN ID.

Other related questions:
Does the U1900 series unified gateway support loopback test
Method of performing the loopback test for the E1 line on the U1900: - Physically connect a pair of tx and rx ports of the E1 line, and obseve the RFA indicator and LOS indicator on the U1900. If they are both off, the local loopback test is successfully.

How can I configure the default VLAN ID of an interface on a CE switch
The default VLAN ID of interfaces is VLAN 1. # Set the default VLAN of an access interface to VLAN 3.
system-view
[~HUAWEI] vlan batch 3
[*HUAWEI] interface 10ge 1/0/1
[*HUAWEI-10GE1/0/1] port link-type access
[*HUAWEI-10GE1/0/1] port default vlan 3
[*HUAWEI-10GE1/0/1] commit
# Set the default VLAN of a trunk interface to VLAN 4.
system-view
[~HUAWEI] vlan batch 4
[*HUAWEI] interface 10ge 1/0/1
[*HUAWEI-10GE1/0/1] port link-type trunk
[*HUAWEI-10GE1/0/1] port trunk pvid vlan 4
[*HUAWEI-10GE1/0/1] commit
# Set the default VLAN of a hybrid interface to VLAN 5.
system-view 
[~HUAWEI] vlan batch 5
[*HUAWEI] interface 10ge 1/0/1
[*HUAWEI-10GE1/0/1] port link-type hybrid
[*HUAWEI-10GE1/0/1] port hybrid pvid vlan 5
[*HUAWEI-10GE1/0/1] commit

WLAN service set
WLAN service set A wireless network consists of radio profiles and service sets. - A radio profile contains WMM (QoS) profiles. - A service set contains traffic and security profiles, SSIDs, and WLAN-ESS/WLAN-BSS interfaces (wireless air interfaces). Service VLANs must be configured on ACs. - The wireless air interface is the logical interface for APs to connect to a STA. Typically, the wireless air interface is configured to work in hybrid mode.

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.

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