How to adjust the serial interface rate of an AR routers

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The serial interface rate of an AR router cannot be adjusted.

For a serial interface running in DTE mode, you can run the virtualbaudrate command to configure the virtual baud rate of the serial interface in synchronous mode.
For a serial interface running in DCE mode, you can run the baudrate command to configure the baud rate of the serial interface in synchronous mode.

The baud rate determines the transmission rate of a line. Supported baud rate range varies with cable types.
? V.24DCE: 1200 bit/s - 64000 bit/s
Baud rate ranges supported by V.35DCE, RS449DCE, and RS530DCE are described as follows:
- The baud rate supported by 1SA/2SA interface cards ranges from 1200 bit/s to 2048000 bit/s.
- The baud rate supported by 8SA interface cards ranges from 1200 bit/s to 8192000 bit/s.
- The baud rate supported by the serial interface of AR2202-48FE ranges from 1200 bit/s to 8192000 bit/s.

Supported virtual baud rate range varies with cable types.
? V.24DTE: 1200 bit/s - 64000 bit/s
Virtual baud rate ranges supported by V.35DTE, X.21DTE, RS449DTE, and RS530DTE are described as follows:
- Virtual baud rate supported by 1SA/2SA interface cards ranges from 1200 bit/s to 2048000 bit/s.
- Virtual baud rate supported by 8SA interface cards ranges from 1200 bit/s to 8192000 bit/s.
- Virtual baud rate supported by the serial interface of AR2202-48FE ranges from 1200 bit/s to 8192000 bit/s.

Ensure that the baud rate configured on the DCE device (by running the baudrate command) is in accordance with the virtual baud rate configured on the DTE device (by running the virtualbaudrate command). Otherwise, packets may be discarded.

Other related questions:
How to dynamically adjust the CPCAR rate on an AR router
In case of a system attack, the CPCAR rate static adjustment function cannot control the rate of delivering packets to the CPU in a timely manner. As a result, the CPU is overloaded, severely affecting the running state of the CPU. The CPCAR rate dynamic adjustment function can periodically detect the CPU usage. When detecting that the current CPU usage of the system exceeds a set threshold, the function dynamically adjusts the CPCAR within a normal range to reduce the impact of the attack on the CPU. The configuration procedure is as follows: 1. Run the system-view command to access the system view. 2. Run the cpu-defend policy policy-name command to access the anti-attack policy view. 3. Run the rate-adaption enable command to enable the CPCAR rate dynamic adjustment function. By default, the CPCAR rate dynamic adjustment function is not enabled. 4. Run the rate-adaption adjust-period period-value command to configure an interval of periodically detecting the CPU usage. By default, the periodical detection interval is 30s. 5. Run the rate-adaption cpu-usage threshold low low-value high high-value command to configure a CPU load threshold for triggering the CPCAR rate dynamic adjustment function. By default, the minimum CPU load threshold for triggering CPCAR rate dynamic adjustment is 65%, and the maximum threshold is 85%. 6. Run the rate-adaption adjust-step step-value command to configure an adjustment amplitude of the CPCAR rate. By default, the adjustment amplitude of the CPCAR rate is 20%. 7. (Optional) Run the rate-adaption exception packet-type packet-type command to configure types of protocols to which the CPCAR rate dynamic adjustment function does not apply. By default, the CPCAR rate dynamic adjustment function applies to all types of protocols.

How to check the rate of an interface of an AR router
You can run the display interface ethernet brief command on an AR router to check the brief information about the Ethernet interface of the router, including the physical state, auto-negotiation method, duplex mode, rate, and average bandwidth utilization rate in the receiving and sending directions in the recent period of the interface. In the output information displayed after the command is run, the Bandwidth column describes the bandwidth of the interface. In auto-negotiation mode, you can run the auto speed { 10 | 100 | 1000 }* command to configure the rate of the Ethernet interface. You can run the undo negotiation auto command to configure the Ethernet interface to be working in non-auto negotiation mode and run the speed { 10 | 100 | 1000 | 10000 } command to configure the rate of the Ethernet interface in the non-auto negotiation mode.

The physical state of a serial interface is Up but the protocol state of the interface is Down
For the problem that the physical state of a serial interface is Up but the protocol state of the interface is Down, see the troubleshooting guide. For details, access the URL in the right column.

Description of synchronous/asynchronous serial interfaces of AR routers
The serial interface is one of the most commonly used WAN interfaces. A serial interface can work in synchronous mode or asynchronous mode. Therefore it is also called the synchronous/asynchronous serial interface. Devices support the following synchronous serial interfaces: - Synchronous interfaces generated from synchronous/asynchronous serial interfaces that work in synchronous mode, which are named as Serial Devices support the following asynchronous serial interface: - Asynchronous interfaces generated from synchronous/asynchronous serial interfaces that work in asynchronous mode, which are named as Serial - Dedicated asynchronous serial interfaces which are named as Async 1. Serial interfaces have the following features in synchronous mode: - Serial interfaces can work in data terminal equipment (DTE) mode or data circuit-terminating equipment (DCE) mode. Devices on which DTE cables are connected to the serial interface are named as DTE devices. Devices on which DCE cables are connected to the serial interface are named as DCE devices. In general, devices are used as DTE devices and receive the clock provided by DCE devices. - Serial interfaces support the following link-layer protocols: PPP, X.25, LAPB, FR, and HDLC. - Serial interfaces support protocols in the IP network layer. 2. In asynchronous mode, serial interfaces can work in protocol mode or stream mode. ? Protocol mode - In protocol mode, after the physical link of a serial interface is established, the serial interface uses the existing link-layer protocols to configure parameters and establish the link. - In protocol mode, the type of link-layer protocol is PPP. - In protocol mode, serial interfaces support protocols in the IP network layer. ? Stream mode - In stream mode, when the devices connected to both ends of a serial interface begin to interact with each other, a device can send configuration information to the peer device to configure the physical-layer parameters of the peer device and establish the link. - In stream mode, serial interfaces do not support protocols in the IP network layer or link layer.

What are the differences between the E1 interface and the serial interface of an AR router
The differences and relationship between the E1 interface and the serial interface of an AR router are described as follows: The serial interface of an AR router uses the DB9 female connector. It is the physical implementation of the E1 interface and is used transmit data in lines with 2 Mbit/s and lower bandwidth. DB9 male connectors used on PCs are also called serial interfaces in some scenarios. However, these interfaces are used only to connect to the console interface of routers for device debugging.

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