On Mon, Oct 11, 2021 at 11:13:36PM +0530, Prasanna Vengateshan wrote:

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Do you have an explanation for what SW_VLAN_ENABLE does exactly?

Enabling the VLAN mode and then act as per the VLAN table.
Do you want me to add this explanation as a comment? or?

Yes, not all switches have the same knobs, it would be good to have a
comment about what you are changing.

Step (0)

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ip link add br0 type bridge vlan_filtering 1
ip link set lan0 master br0
bridge vlan add dev lan0 vid 100 pvid untagged

Step (1)

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bridge vlan del dev lan0 vid 100

Step (2)

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ip link set br0 type bridge vlan_filtering 0

The expectation is that the switch, being VLAN-unaware as it is currently
configured, receives and sends any packet regardless of VLAN ID.
If you put an IP on br0 in this state, are you able to ping an outside host?

I have numbered the commands above.
Results are,
Before Step (0). Am able to ping outside.
After Step (0). Am not able to ping outside because the vlan table is set
After Step (1). Am not able to ping outside
After Step (2). Am able to ping outside because of vlan unaware mode.

This sounds okay.