Both of Huawei and V2710 are behind Cisco router's NAT, so could it possible provide us ARP table on Cisco Router for reference ?
We guess the issue may cause by incorrect ARP table update on Cisco router.
I means when telnet "10.249.84.163" (Huawei) , then Vigor2710 response this request.
Maybe Cisco router support set ARP response to binding 10.249.84.163 with Huawei or try to clear ARP table , then see can it possible prevent strange telnet response issue.
We will try to building similar network topology for reproduce this issue in our lab.