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[PTX] Understanding the maximum file download speed to a device using non-management interfaces (network ports)



Article ID: KB37343 KB Last Updated: 21 Sep 2021Version: 1.0

This article explains the maximum download speed for copying files to a PTX device when using non-management interfaces (network ports such as any ethernet except management port em0).


Even if the actual interface speed is 100Gbps, you may only get 1.2Mb/s of download speed.

DUT download speed test:

root@PTX1000-re0:/var/home/labroot # scp root@ /var/tmp
junos-install-mx-x86-64-18.4R3-S8.3.tgz                                             69% 1881MB   1.2MB/s   11:53
ETA^CKilled by signal 2.
root@PTX1000-re0:/var/home/labroot #

DUT(monitor interface output)
Interface: ae3, Enabled, Link is Up
Encapsulation: Ethernet, Speed: 100000mbps
Traffic statistics:                                              Current delta
  Input bytes:                 790237675 (9660592 bps)                     [0]
  Output bytes:                  5419887 (65752 bps)                       [0]
  Input packets:                   96031 (146 pps)                         [0]
  Output packets:                  78827 (119 pps)                         [0]
Error statistics:
  Input errors:                        0                                   [0]
  Input drops:                         0                                   [0]
  Input framing errors:                0                                   [0]
  Carrier transitions:                 0                                   [0]
  Output errors:                       0                                   [0]
  Output drops:                        0                                   [0]

Next='n', Quit='q' or ESC, Freeze='f', Thaw='t', Clear='c', Interface='i'
-re0                      Seconds: 96                  Time: 00:48:40
The host bound traffic (traffic destined to an IP address of the PTX itself that is handled by the RE) is limited to 10Mbps on all PTX platforms.

This behavior is expected for all PTX platforms as host-bound traffic (to RE) is shaped to 10Mbps.

As a workaround, in the production network, management port (em0) can be used to increase file download speed.

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