When sonic-vpp receives ROUTE_ENTRY create, it will remove the Loopback interface in kernel and recreate it via vpp lcp create. And reset the address to Loopback interface after that. When there are multiple loopback addresses (for example, one v4 and one v6 address) configured in a short time, such as loading mini-graph, the second loopback address will be lost due to this race condition. When it recreate the Loopback interface and reconfigure the first loopback address, the second address is lost.
yue-fred-gao
commented
1 week ago
When sonic-vpp receives ROUTE_ENTRY create, it will remove the Loopback interface in kernel and recreate it via vpp lcp create. And reset the address to Loopback interface after that. When there are multiple loopback addresses (for example, one v4 and one v6 address) configured in a short time, such as loading mini-graph, the second loopback address will be lost due to this race condition. When it recreate the Loopback interface and reconfigure the first loopback address, the second address is lost.