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After a Huawei AR Router Configured with the 8E1/T1-F Card Replaces a Cisco Device Configured with the 8E1/T1-F Card and Is Connected to the Remote Device, Why Do Connected Interfaces Alternate Between Up and Down States?
In framed mode, an E1-F interface supports two frame formats: CRC4 and non-CRC4.
By default, E1-F interfaces on Huawei devices use the non-CRC4 frame format and E1-F interfaces on Cisco devices use the CRC4 frame format. If the local and remote interfaces use different frame formats, the interfaces alternate between Up and Down states after being connected. To solve this problem, run the fe1 frame-format { crc4 | no-crc4 } command on the E1/T1-F card to set the frame format of E1-F interfaces first to ensure that the local and remote interfaces use the same frame format.