Switching

I was wondering if anyone else was showing the same output when checking interface status. After our most recent upgrade to 15.1R7.8 our interfaces have been showing (Speed: Auto, Duplex: Half-duplex) instead of (Speed: Auto, Duplex: Auto) as in other versions. The Link partner shows connected at Link mode: Full-duplex, Speed: 1000 Mbps. I'm not sure if it's causing problems, but as I look through the statistics I think it is. This port currently has 9591 drops. I just cleared the stats and will monitor. We're showing the same behavior across many other virtual chassis and stand alone chassis. If this is a duplicate forum post my apologies in advance.
 
 
 
> show interfaces ge-0/0/16 media
Physical interface: ge-0/0/16, Enabled, Physical link is Up
  Interface index: 340, SNMP ifIndex: 1229
  Description:  
  Link-level type: Ethernet, MTU: 1514, LAN-PHY mode, Speed: Auto, Duplex: Half-duplex, BPDU Error: None, MAC-REWRITE Error: None, Loopback: Disabled, Source filtering: Disabled, Flow control: Enabled, Auto-negotiation: Enabled,
  Remote fault: Online, Media type: Copper
  Device flags   : Present Running
  Interface flags: SNMP-Traps Internal: 0x0
  Link flags     : None
  CoS queues     : 8 supported, 8 maximum usable queues
  Current address: xx:xx:xx:xx:xx:xx, Hardware address: xx:xx:xx:xx:xx:xx
  Last flapped   : 2018-07-10 18:01:17 EDT (16:28:43 ago)
  Input rate     : 512 bps (1 pps)
  Output rate    : 2096 bps (3 pps)
  Active alarms  : None
  Active defects : None
  MAC statistics:
    Input bytes: 61117235598, Input packets: 104139384, Output bytes: 44274883406, Output packets: 116256253
  Autonegotiation information:
    Negotiation status: Complete
    Link partner:
        Link mode: Full-duplex, Flow control: Symmetric/Asymmetric, Remote fault: OK, Link partner Speed: 1000 Mbps
    Local resolution:
        Flow control: Symmetric, Remote fault: Link OK
  Interface transmit statistics: Disabled
 
   
   
> show configuration interfaces ge-0/0/16
unit 0 {
    family ethernet-switching {
        vlan {
            members WORKSTATIONS;
        }
    }
}
 
 
Model: ex4200-48t
Junos: 15.1R7.8

Saw the same issue on the QFX/ACX platform and it was just a cosmetic incorrect showing in the interface but I don't see the ex listed in the PR.  This was fixed in Junos 17

https://prsearch.juniper.net/InfoCenter/index?page=prcontent&id=pr1286709

Thanks for the reply and the PR link. I think it's cosmetic in the EX case also. There hasn't been any collisions or drops in the 21 hours since the statistics were last cleared.

What is the actual link partner and how is it configured?  Looks like link partner may auto-neg speed only, which would cause EX4200 port set to auto to default to half-duplex.

rccpgm - It's a mix of servers and workstations all configured for Auto Speed / Auto Duplex.

FYI, EX4200 can never run 17.x code.  EX4200 code support stops at 15.1R'x'.  @LovingTheJunos, if you plug a PC set for Auto into a port on the EX4200, what does the EX4200 show?  This could be a cosmetic bug in 15.1R7.  What code release were you running previously?

@rccpgm Thanks for the FYI...prior to running 15.1R7 we were at  version 15.1R6.7. The command output in the original post was of a port with a PC set for Auto/Auto.

Hello all,

This is known issue on this code and the correction is on code 15.1R7-S2.

There is a PR about it, please check below:

https://prsearch.juniper.net/InfoCenter/index?page=prcontent&id=PR1364659

Hope it helps!