For 40G optics there is SAI handling of T0 facing ports to be set with SR4 type and unreliable los set for a fixed set of ports. For this property to be invoked the requirement is set
phy_unlos_msft=1 in config.bcm.
This change is to meet the requirement and once this property is set, the los/interface type settings is applied by SAI on the required ports.
Why I did it
For Arista-7060CX-32S-Q32 T1, 40G ports RX_ERR minimalization during connected device reboot
can be achieved by turning on Unreliable LOS and SR4 media_type for all ports which are connected to T0.
The property phy_unlos_msft=1 is to exclusively enable this property.
Microsoft ADO: 25941176
How I did it
Changes in SAI and turning on property
How to verify it
Ran the changes on a testbed and verified configurations are as intended.
with property
admin@sonic2:~$ bcmcmd "phy diag xe8 dsc config" | grep -C 2 "LOS"
Brdfe_on = 0
Media Type = 2
Unreliable LOS = 1
Scrambling Disable = 0
Lane Config from PCS = 0
without property
admin@sonic:~$ bcmcmd "phy diag xe8 dsc config" | grep -C 2 "LOS"
Brdfe_on = 0
Media Type = 0
Unreliable LOS = 0
Scrambling Disable = 0
Lane Config from PCS = 0
Signed-off-by: vaibhav-dahiya <vdahiya@microsoft.com>
9eef01d7a7