interfaces with SFP-LX10 or SFP-LH optics will remain down on ACX5448 due to auto-negotiation problem

auto-negotiation should be disabled from PFE level for SFP-LX10/LH on ACX5448 due to interoperability issue. this is already applied on SFP-LX but missed from SFP-LX10/LH.

SFP-LX10 or SFP-LH optic interface will remain down on ACX5448 if the connected peer does not enable Auto-Negotiation on its interface.

root@ACX5448> show chassis hardware detail no-forwarding
Hardware inventory:
Item Version Part number Serial number Description
Chassis XW0220240291 ACX5448
Midplane REV 08 650-077913 XW0220240291 ACX5448
<..>
Xcvr 5 REV 01 740-011614 N58BFYA SFP-LX10      <<<<<<<<<SFP-LX10 at port 5
Xcvr 6 REV 01 740-038291 E248885 SFP-T
<..>

root@ACX5448> show interfaces terse xe-0/0/5  

Interface        Admin Link Proto  Local         Remote

xe-0/0/5        up  down                      <<<<<<<<<this link is down

customer need to have the fix of PR1721928 . with this fix , auto-negotiation is disabled on interfaces with SFP-LX10/LH
 

as workaround , customer can use one of the below options to recover from this issue:

1-  add loopback knob and rollback it again from the interface

root@ACX5448# set interfaces xe-0/0/5 gigether-options loopback

root@ACX5448# commit

commit complete

root@ACX5448# rollback 1

load complete

[edit]

root@ACX5448# show | compare

[edit interfaces xe-0/0/2 gigether-options]

- loopback;

[edit]

root@ACX5448# commit

commit complete

OR

2- Move SFP-LX10 to any other port >24 hence you can disable auto-negotiation from CLI according KB80789 [juniper.net]
 

root@ACX5448# show | compare

[edit interfaces xe-0/0/30 gigether-options]

- auto-negotiation;

+ no-auto-negotiation;

[edit]

root@ACX5448# commit

commit complete