[j-nsp] Recommended firmware for QFX5100-48T

joel jaeggli joelja at bogus.com
Mon Oct 10 11:21:42 EDT 2016

On 10/10/16 7:34 AM, Paul S. wrote:
> Hi folks,
> Are everyone running the JTAC recommended 14.1X53-D35.3 or have you
> found better stability at some newer revision?
> My problem is that the "tri state" 10g ports (copper) don't seem to
> want to run at anything less than 10g. It links up when connected to a
> 1g device, but still claims that the port is operating in 10g mode.
> The biggest issue I have is that if I assign a /30 to the p2p
> interfaces (between the qfx and any copper 1g device), my p2p latency
> is somewhere from 10 to 40ms.
> I asked around to see if there's any way to force the ports into 1g
> mode, but the "speed" knob is missing. I deliberately turned on
> auto-negotiation, does not seem to help.
> 802.3ad LAGs created using any of these links also claim to have
> speeds of 20g/40g when there's in reality only 4g of capacity.
> Can someone hit me with a clue stick? Thanks!

I presume that you're specifing the port config as ge-0/0/foo rather
than xe-0/0/foo

joel@ show interfaces ge-0/0/46
Physical interface: ge-0/0/46, Enabled, Physical link is Up
  Interface index: 701, SNMP ifIndex: 616
  Link-level type: Ethernet, MTU: 1514, Speed: 1000mbps, BPDU Error:
None, MAC-REWRITE Error: None, Loopback: Disabled, Source filtering:
Disabled, Flow control: Disabled, Auto-negotiation: Enabled,
  Remote fault: Online, Media type: Copper
  Device flags   : Present Running
  Interface flags: SNMP-Traps Internal: 0x4000
  Link flags     : None
  CoS queues     : 12 supported, 12 maximum usable queues
  Current address:
  Last flapped   : 2016-08-26 03:31:56 UTC (6w3d 19:46 ago)
  Input rate     : 0 bps (0 pps)
  Output rate    : 0 bps (0 pps)
  Active alarms  : None
  Active defects : None
  Interface transmit statistics: Disabled

  Logical interface ge-0/0/46.0 (Index 563) (SNMP ifIndex 617)
    Flags: SNMP-Traps 0x4004000 Encapsulation: ENET2
    Input packets : 146287
    Output packets: 292513
    Protocol inet, MTU: 1500
      Flags: Sendbcast-pkt-to-re
      Addresses, Flags: Is-Preferred Is-Primary

joel@> show chassis hardware
Hardware inventory:
Item             Version  Part number  Serial number     Description
Chassis                                                 QFX5100-48S-6Q
Pseudo CB 0
Routing Engine 0          BUILTIN      BUILTIN           QFX Routing Engine
FPC 0            REV 05                                     QFX5100-48S-6Q

    Xcvr 46               NON-JNPR          SFP-T

joel@> show version
Model: qfx5100-48s-6q
JUNOS Base OS Software Suite [13.2X51-D38]
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