Customer wanted a long term solution for an auto-negotiation issue which was brought by a PR1721928 & provide them an option to configure auto-negotiation on their ACX5448 which is disabled as per PR1721928.
They also have another PR1714111 for which they wanted to have fix.
Partner has asked the customer to check the knob below on version 22.4R3-S4 after discussion with the accounts team
"set interfaces xe-0/0/0 gigether-options auto-negotiation"
So they have tested manually configuring auto-neg on version 22.4R3-S4 but this makes no difference compared to the default configuration.
Auto neg still does not work, and if the other side uses auto-neg the link will remain down on their end until they remove auto-neg.
junos-vmhost-install-acx-x86-64-21.4R3-S5.4.tgz
ACX: ASR9K:
auto - auto:
up - up
no auto - auto:
auto - no auto:
down - up
no auto - no auto:
junos-vmhost-install-acx-x86-64-22.2R3-S6.5.tgz
junos-vmhost-install-acx-x86-64-22.4R3-S4.5.tgz
up - down
After the behaviour change via PR1721928, all releases after 23.2R2 will by default have the fix for this PR.
So on these releases, AN will not work & as it is a behaviour change this cannot be changed back via JTAC cases.
If you requirement is only to go for a release, were PR1721928 is not fixed & PR1714111 is fixed, you can go ahead with 23.2R1.
But if we are looking at long term solution, below is the option.
++++++++++++++++++++++++++++++++
ACX5448 interface drivers now support configuring no-auto-negotiation across all ports. Previously, the SFP_LX family optics encountered auto-negotiation compatibility issues with other vendors(Huwaei, Cisco). Due to SerDes limitations, auto-negotiation was disabled by default for the SFP_LX optics in RIO (PR1721928).
With the latest update, via internal PR 1874706, the no-auto-negotiation knob can be configured on all ports, and the default no-auto-negotiation configuration for the SFP_LX optics has been removed. Customers now have the flexibility to configure auto-negotiation/no-auto-negotiation knobs based on their specific requirements.
The PR mentioned by engineering is fixed in below versions.
junos:24.4R2 junos:25.2R1