[202311]Fix multi VLAN neighbor learning (#3049) #3064
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What I did When adding a new neighbor, check if the neighbor IP has already been learned on a different VLAN. If it has, remove the old neighbor entry before adding the new one. Why I did it On Gemini devices, if a neighbor IP moves from an active port in one VLAN to a second VLAN, then back to the first VLAN (with 3 different MAC addresses), orchagent will crash. Even though the MAC address of the last move is different from the first MAC address, orchagent believes the last MAC address to already be programmed in the hardware and tries to set an attribute of the entry which doesn't exist.
prsunny
approved these changes
Feb 27, 2024
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@StormLiangMS for viz |
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202311 cherry-pick of #3049
What I did
When adding a new neighbor, check if the neighbor IP has already been learned on a different VLAN. If it has, remove the old neighbor entry before adding the new one.
Why I did it
On Gemini devices, if a neighbor IP moves from an active port in one VLAN to a second VLAN, then back to the first VLAN (with 3 different MAC addresses), orchagent will crash. Even though the MAC address of the last move is different from the first MAC address, orchagent believes the last MAC address to already be programmed in the hardware and tries to set an attribute of the entry which doesn't exist.
What I did
Why I did it
How I verified it
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