The state of an interconnected SA interface cannot be Up

1

Problem description: The state of the physical interface and protocol of the SA card cannot be Up.
Serial1/0/0 current state: DOWN
Line protocol current state: DOWN
Description: HUAWEI, AR Series, Serial1/0/0 Interface
Route Port,The Maximum Transmit Unit is 1500, Hold timer is 10(sec)
Internet Address is 172.20.18.22/30
Link layer protocol is nonstandard HDLC
Last physical up time : 2012-08-09 16:04:29
Last physical down time : 2012-08-09 16:04:29
Current system time: 2012-08-09 16:32:47
Physical layer is synchronous, Virtualbaudrate is 64000 bps
Interface is DTE, Cable type is V24, Clock mode is TC
Last 300 seconds input rate 0 bytes/sec 0 bits/sec 0 packets/sec
Last 300 seconds output rate 0 bytes/sec 0 bits/sec 0 packets/sec
Handling process:
1. If the peer end does not receive the signal, run the following command to set the transmit clock signal of the serial interface in inversion synchronization mode:
[Huawei-Serial1/0/0]invert transmit-clock
2. If the local end does not receive the signal, run the following command to set the receive clock signal of the serial interface in inversion synchronization mode.
[Huawei-Serial1/0/0]invert receive-clock
Note: Clock signals of the serial interface in inversion synchronization mode can be configured only when AR3200 is used as a DTE device.
After the preceding steps, most of the problems that the state of the SA interface is not Up can be resolved or filtered out.
Root cause:
The clock phases of the peer devices connected through the SA interface are not consistent.

Other related questions:
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.

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

Handling of the problem that the state of optical interfaces of an AR router is not Up
The handling roadmap of the problem that the state of optical interfaces of an AR router is not Up is as follows: 1. The negotiation methods, rates, and duplex modes of both ends must be the same. 2. Check whether the optical fiber and optical module are matched and used correctly. - Multimode optical fibers can be used with single-mode optical modules in short distance scenarios. - Single-mode optical fibers can be used only with single-mode optical modules. - Check whether the optical interface and optical module are incorrectly matched. For example, a 100M optical interface is connected to a 1000M optical module. - Check whether the optical modules are authorized by Huawei. - Generally, single-mode optical fibers are yellow and multimode optical fibers are orange. 3. Run the display transceiver interface interface-type interface-number command to check whether the wavelength of the optical module to be interconnected is in accordance with that of the optical interface and whether the distance is proper. 4. Run the display transceiver interface interface-type interface-number verbose command to check whether the transmit and receive optical power of the optical interface is normal. 5. If the cause of the problem cannot be determined, consider to replace the optical module and optical fiber. For the problem that the state of an optical interface of an AR router is not Up, see the troubleshooting guide. For details, access the URL in the right column.

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