There is a problem with connection between Huawei AR28 and Cisco 10000. This connection is realized by multi PPP on E1 interfaces. When I connected this two routers, I can’t send to AR28 big packets.
When I configure Link Fragmentation on AR28, max send packet is 1000 bytes. Without LFI max packet is 64 bytes. I tested on Cisco router configuration with and without enabled fragmentation on interfaces E1. This configuration doesn’t matters to working Huawei router.
Single link E1 (ppp) between Cisco and Huawei work properly.
By changing the minimum settings for fragment at AR28-11 to 1500-byte, and MTU is 1400-byte the problem has been solved.
ppp mp min-fragment 1500