> Can confirm I've seen exactly the same issue on QFX5110 18.4R1.8 with the
> only way I can get fs.com LX 1G
> transceivers working being turning off auto-neg.
Thanks. We've been looking at the Broadcom tools on the QFX and note some
apparently quite major differences in the way that the interfaces negotiate
across versions.
In the older satellite verions (e.g. 2.0R1.1), GE interfaces appear to have the
correct auto neg state set on the chipset. This seems to coincide with it using
GMII between the SFP and the board. This reflects the way the ports are
configured in Junos:
ena/ speed/ link auto STP lrn inter max
loop
port link duplex scan neg? state pause discrd ops face frame
back
xe4 up 1G FD HW Yes Forward None F GMII 1604
xe6 up 1G FD HW No Forward None F GMII 1522
xe10 up 1G FD HW Yes Forward None F GMII 1526
xe11 up 1G FD HW Yes Forward None F GMII 1526
xe12 up 1G FD HW Yes Forward None F GMII 1526
On newer versions (e.g. 3.5R2.2), GE interfaces are always shown as auto-neg
disabled on the chipset:
ena/ speed/ link auto STP lrn inter
max loop
port link duplex scan neg? state pause discrd ops face
frame back
ge0( 3) up 1G FD HW No Forward None F SGMII
1518
ge1( 4) up 1G FD HW No Forward None F SGMII
1518
ge2( 6) down 1G FD HW No Forward None F SGMII
1518
ge3( 12) !ena 1G FD HW No Forward None F SGMII
1518
ge4( 13) up 1G FD HW No Forward None F SGMII
1526
ge5( 15) up 1G FD HW No Forward None F SGMII
1526
They will show as up here and in Junos but not on the remote device.
Forcefully setting the interface to '[gig]ether-options auto-negotiate' does
not change the bcm setting.
If you forcefully change the bcm setting (i.e. tell the chipset to auto-neg),
the port goes down both in the bcm shell and in Junos.
Interestingly, some of these ports work, others do not. We haven't been able to
identify a pattern and JTAC are still looking.
We also can't explain why these ports indicate they are SGMII.
At the behest of JTAC we put these on 3.5R1-S4.0. This has the characteristic
that in the following example we have a MM (port 1) and SM (port 3)
transceiver. Both are Flexoptix correctly coded (we've tried others). Port 1
gets link successfully, Port 3 does not. Note that now the working port is back
to GMII:
ena/ speed/ link auto STP lrn inter
max loop
port link duplex scan neg? state pause discrd ops face
frame back
ge0( 1) up 1G FD HW Yes Forward None F GMII
1518
ge1( 3) down 10M FD HW Yes Forward None F SGMII
1518
Can anyone shed any more light on this?
Regards,
Tim
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