What are the conditions for the VPLS VSI in Up state

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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.

Other related questions:
Why the VSI cannot be Up when the switch connects to a Cisco device over the VPLS network
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.

What state will an end in Down state change to after it receives an Up packet
If the link between two communication ends encounters an instant disconnection after the two ends become Up, one end sends a BFD Down packet to the remote end after detecting the Link Down event. The remote end sends a BFD Up packet to the local end before receiving the BFD Down packet. The local end does not change its state after receiving the Up packet. This prevents network flapping.

The state of the E1 interface of an AR router is not Up
If the state of the E1 interface of an AR router is not Up, perform the following steps: 1. If the physical state of the interface is not Up, check the physical cables. - If coaxial cables are used for the communication between devices, exchange the sending cable and receiving cable. - If balanced cables are used for the communication between devices, check whether line order of the cables is correct. The line order of the DB9 connector on the card: Line 1 and line 2 are the receiving lines. Line 6 and line 7 are the transmitting lines. The line order of the RJ45 connector used by balanced cables: Line 1 and line 2 are the transmitting lines. Line 4 and line 5 are the receiving lines. 2. Check whether the configuration of the E1 interface is consistent with that of the interconnected physical interface. - Enter the Controller interface view and run the display this command to check the configuration of the Controller interface. - Check whether the physical attributes of the Controller interfaces on both ends are consistent, such as the frame format, coding format, data inversion, cable impedance, and timeslot number. - The clocks at both ends must work in master/slave mode. - If the configurations of the interfaces are not consistent, or the state of the interface alternates between Up and Down, configure the interfaces on both ends again. - If the configurations of the interfaces on both ends are consistent and meet the requirements above, and if the physical state of the interface keeps Up stably, perform step 3. 3. Check whether the configurations of the serial interfaces on both ends are consistent. - Enter the serial interface view and run the display this command to check the configuration of the serial interface. - Check whether the attributes of the serial interfaces on both ends are consistent, such as the encapsulation and CRC methods. If the PPP authentication method is used, check whether the authentication methods used by both ends are consistent, whether the user names and passwords are correct, and whether the FR-DLCI configurations are consistent. In addition, check whether the serial interfaces are shut down. - If the configurations of the serial interfaces on both ends are not consistent, configure the serial interfaces again. - If the interface cannot send and receive data properly even if the configurations of the serial interfaces on both ends are consistent, perform step 4. 4. Check whether the serial interfaces transmit and receive data. - Enter the views of the serial interfaces and run the display this interface command to check whether the serial interfaces on both interconnected ends transmit data. - If the serial interfaces do not transmit data, the negotiation packet in the upper layer is not sent properly. In this case, try to run the shutdown command or undo shutdown command to trigger the sending of the negotiation packet in the upper layer. - If the serial interfaces transmit and receive data, perform step 5. 5. Check whether the data transmitted or received by the serial ports includes error packets. - Enter the views of the serial interfaces and run the display this interface command to check whether the data received by the serial interfaces on both interconnected ends includes a large number of CRC error packets and whether the number of error packets increases. - If the data received by the serial interfaces includes a large number of CRC error packets, check whether the cables are connected firmly. For the problem that the state of an E1 interface of an AR router is not Up, see the troubleshooting guide. For details, access the URL in the right column.

The state of an E1 interface is not Up when the interface interconnects with the peer device
For the problem that the state of an E1 interface of an AR router is not Up when the interface interconnects with other devices, see the troubleshooting guide. For details, access the URL in the right column.

What it means when the state of the FR link protocol is Up
It means that the negotiation of the Local Management Interface (LMI) protocol is successful. You can run the display fr interface command to check the FR protocol information about the interface.

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