Why the VSI cannot be Up when the switch connects to a Cisco device over the VPLS network

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On a Cisco device, a Layer 3 interface or main interface that is bound to a VSI uses the Ethernet encapsulation mode, and a sub-interface that is bound to a VSI uses the VLAN encapsulation mode by default. On a switch, a Layer 3 interface, main interface, or sub-interface that is bound to a VSI uses the VLAN encapsulation mode by default. If the encapsulation modes on the switch and Cisco device are different, the VSI cannot be Up.

Other related questions:
What are the conditions for the VPLS VSI in Up state
The encapsulation modes and MTUs at both devices must be the same. In addition, the following conditions must be met: 1.The PW is Up. 2.At least one AC port is Up. If the VPLS VSI cannot be Up, check whether the PW is Up, whether the LSP is established, and whether the AC port is Up.

Can link aggregation be performed when Huawei switch connects to a Cisco switch
Link aggregation can be performed when Huawei switch connects to a Cisco switch.

The AR connects to a Cisco device using a dynamic template
The AR connects to a Cisco device using a dynamic template. For details, see "Example for Establishing an IPSec Tunnel Through Negotiation Initiated by the Branch Gateway with a Dynamic IP Address to the Headquarters Cisco Router (Using Dynamic Crypto Map Entry)" of "Using VPN to Implement WAN Interconnection-IPSec" in Typical Configuration Examples.

The reason why a device directly connected to an AR router cannot be pinged or the IP address of the device that is obtained over DHCP is returned slowly
In Layer 2 networks, STP can solve network loop problems. By default, this function is enabled on an AR router. If the AR router is used as a user access device (the WAN interface of the router is connected to the Internet, and the LAN interface is connected to an intranet), there is no risk of loop generally. In this case, you are advised to run the stp disable command to disable STP and avoid interface blockage due to the enabled STP function or network flapping due to STP convergence. For example, a device directly connected to an AR router cannot be pinged or the IP address of the device that is obtained over DHCP is returned slowly.

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