Topology: user 1-MA5100-MA5200G-NE80-S8016-ERX1400-MA5100-user 2
BGP-MPLS-VPn has been set up and mutual private network route has been learned and they can ping. Ping large packet such as 1500 and it is no problematic. When double-way traffic is reachable, user 1 can copy large file of user 2 and load file with few K to user 2. User 2 can copy small file of user 1, but cannot load file to user 2.
User 1 can copy large file of user 2 and can load file with few K to user 2. User 2 can copy small file of user 1, but cannot load file to user 2.
Use internal OA and it cannot be opened.
Change MTU of interconnected interface of our device as 1526 and changes ERX1400 side as 1530. MA5100 of both sides is not changed. The problem is solved.
The route and large packet can be pinged. It is doubted that larger packet cannot be fragmented. Contact with engineer of ERX1400. The MTU of interconnected interface is defaulted to 1500.