As picture in the attachment name network, OSN3500EGT2 connect with router Juniper, but when customer use service. They can use only some application service, but FTP application with large packet size can not be used.
For OSN 3500 EGT2 board, setting the MTU (Maximum transmission unit) to be 9600 for both side of OSN 3500 EGT2 board which are connect to Juniper router, Due to the Juniper router also set the MTU as 9600. The problem is solved. Customer can use the FTP application with large frame size.
As some application service which is FTP application with large packet can not be used. Analysis testing of test network 1 as shown in attachment name network1. Use smartbit to generate the large packet and send to OSN3500 on EGT2. The packet with large frame size such as more than 1522 can not be pass as our EGT2 board MTU set only 1522. Then connect as test network2 as shown in attachment name network2. Use the smart bit to generate the large packet and send to Juniper router. The packet with large frame size such as more than 1522 can be pass. As found out that MTU of Juniper router is 9600.
When board EGT2 connect with other equipment setting MTU to be 9600 frame size.