Can the E1 interface of an AR router interconnect with MP-group interfaces

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The E1 interface of an AR router cannot interconnect with MP-group interfaces.
The network works properly only when the configurations of the interfaces on both interconnected ends are consistent.

Other related questions:
How to configure the MP-Group of E1 interfaces of AR routers

MP indicates the Multi-Link Point-to-Point Protocol (MLPPP), in which multiple PPP links are bound together. MP binding is often performed in scenarios where a 2 Mbit/s E1 dedicated line cannot meet the service requirements.
MP interfaces transmit data by packets. AR routers only support the binding of interfaces of the same card.

system-view
[Huawei] interface mp-group 0/0/1 //Create an MP-Group interface and enter the view of the interface.
[Huawei-Mp-group0/0/1] undo discriminator //(Optional) Disable the terminal endpoint identifier negotiation function which is enabled by default. You can disable the function when the interface cannot interconnect with the devices of other manufacturers.
[Huawei-Mp-group0/0/1] ip address 192.168.0.1 24 //You can run the ip address ppp-negotiate command to allow the peer end to allocate the IP address generated through PPP negotiation to the interface.
[Huawei-Mp-group0/0/1] interface serial 2/0/0 //Enter the view of the specified physical interfaces (PPP type)
[Huawei-Serial2/0/0] ppp mp mp-group 0/0/1 //Add the physical interface. You can repeat this step to add multiple interfaces.
[Huawei-Serial2/0/0] restart //Restart the related physical interfaces.

Can the E1 interface of an AR router interconnect with the Ethernet
The E1 interface of an AR router cannot interconnect with the Ethernet. - E1/T1: E1/T1 is a technology of using the synchronous time division multiplexing technology to combine multiple audio channels into a 2 Mbit/s or 1.5 Mbit/s high-speed channel. It is used in WAN in general. - Ethernet: Ethernet uses the Carrier Sense Multiple Access (CSMA) and Conflict Detection (CD) technologies and runs on cables of multiple types with a speed ranging from 10 Mbit/s to 10 Gbit/s. It is used in LAN in general. As described above, the principles, protocols, and application scenarios of E1 and T1 are different. In addition, E1 or other interface cards equipped with four or eight interfaces use RJ45 interfaces but do not use the Ethernet.

AR router troubleshooting guide: The state of an MP-Group interface cannot be Up
For the problem that the state of an MP-Group interface of an AR router is not Up, see the troubleshooting guide. For details, access the URL in the right column.

The ppp-mp interface of an AR router cannot be connected
MP problems of AR routers can be located based on the following roadmap: 1. MP interfaces transmit data by packets, which cannot be modified. 2. AR routers only support the binding of interfaces of the same card. If the binding cannot be performed on cards equipped with two E1 interfaces, perform it on cards equipped with eight E1 interfaces. 3. Focus on member interfaces when locating MP interface problems because most MP interface problems are caused by the member interfaces. 4. In products with earlier versions, out-of-order problems occur on MP interfaces, which results in the stalling of videos. Use products with V200R0003 and later versions. If the state of the E1 interface of an AR router is not Up, check whether the state of the member E1 interface is not Up. If the E1 interface of an AR router cannot communicate with other devices properly, check whether packet losses occur on the member E1 interface.

Description of the E1 interface of an AR router
1. E1/T1: E1/T1 is a technology of using the synchronous time division multiplexing technology to combine multiple audio channels into a 2 Mbit/s or 1.5 Mbit/s high-speed channel. - Maximum rate of E1 cards: 32 (timeslots) x 64 (kbit/s per timeslot) = 2048 kbit/s - Maximum rate of T1 cards: 24 (timeslots) x 64 (kbit/s per timeslot) = 1536 kbit/s - CE1/CT1 cards can determine multiple groups of timeslots and have the Controller view. However, E1 cards can determine only one group of timeslots in the framed mode (other timeslots cannot be used). 2. E1 interfaces are configured on E1/T1 cards and can be seen as serial interfaces (currently supported by AR1200(S)/AR2200(S)/AR3200(S)/AR3600). - 1E1T1-M/2E1T1-M support the E1/CE1/CT1/PRI(E1&T1) interface. - 4E1T1-M/8E1T1-M support the E1/CE1/PRI(E1) interface. - 1E1T1-F/2E1T1-F support the framed/unframed E1/T1 interface. - 4E1T1-F/8E1T1-F support the framed/unframed E1 interface. - The character M in a model name indicates Multiflex Trunk, that is, the model can be fully channelized. The character F in a model name indicates Fractional, that is, the model can be partially channelized. 3. The CE1/PRI interface is the physical interface of the E1 system. It can work in E1 mode (unchannelized mode) or CE1/PRI mode (channelized mode). - In E1 mode, the CE1/PRI interface works as an interface not divided by timeslots, whose bandwidth is 2.048 Mbit/s. - In CE1/PRI mode, the 2M line is divided into 32 timeslots of 64 KB, which are numbered from 0 to 31. Timeslot 0 is used to transfer frame alignment information. a. CE1 interface: All timeslots except timeslot 0 are randomly divided into multiple groups (channel sets). Each group is corresponding to a separated channel. b. PRI interface: Bundle timeslot 16 (D channel) and any one of timeslots 1 to 15 or 17 to 31 (B channel) into a group (PRI set). c. CE1 interfaces can be divided into multiple groups. However, only one group can be bundled for PRI interfaces. 4. The CT1/PRI interface is the physical interface of the T1 system. - CT1 interface: All timeslots (timeslot 1 to 24) can be randomly divided into multiple groups. Timeslots in each group are bundled into a channel set. - PRI interface: Randomly bundle timeslot 24 (D channel) and any one of timeslots 1 to 23 (B channel) into a group (PRI set). - CT1 interfaces can be divided into multiple groups. However, only one group can be bundled for PRI interfaces. 5. E1 interfaces, channel sets, and PRI sets can all be seen as serial interfaces, which have the same logical characteristics as synchronous serial interfaces and support IP network protocols and protocols in the data link layer, such as PPP and HDLC frame relay X.25 protocol (PRI sets do not support the HDLC frame relay X.25 protocol and channel sets of CT1 interfaces do not support the X.25 protocol).

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