• On EX4000 platforms, TFTP image transfers via the management interface (me0) take significantly longer compared to EX4400 and QFX devices.
• While TFTP transfers on EX4400 and QFX complete quickly, the same operation on EX4000 can take up to several hours.
• This behavior is specific to ARM-based platforms and rate limiting applied once the system is fully operational .

• TFTP image transfer on EX4000 takes approximately 2 hours via me0
• Slow TFTP throughput compared to EX4400 and QFX platforms
• Frequent TFTP timeouts observed during image transfer

On the EX4000, once the system is fully up and running, rate limiting is applied to TFTP traffic. This design prioritizes protection of the running system over raw TFTP throughput, resulting in slower transfer speeds.

WORKAROUNDS:

• Increase the TFTP timeout value
• Use other file transfer protocols (like SCP, SFTP)

PLEASE NOTE:

• TFTP rate limiting is not applied in the loader prompt or installer environment. ( Rate limiting is removed in loader prompt in junos:24.4R1-S2 junos:24.4R1-S3 junos:24.4R2 junos:25.2R1 junos:25.3R1 and subsequent releases through PR 1868872 )
• During installer mode or loader prompt, TFTP transfers will be significantly faster. But once the junos is loaded, rate limiting is applied by default.
• This is an expected behavior on the EX4000 platform.