Technical Tip: SD-WAN behavior when a secondary IP is configured over one of the SD-WAN members

Example: SDWAN has two-member Port 9 and Port 10.

Port 10 has a primary IP  x.x.x.x and a secondary IP y.y.y.y configured over it.

If SD-WAN sla on port 10 fails, then the SD-WAN will mark port 10 as inactive, but the routing table database will show route via y.y.y.y as active.

This is an expected behavior because the secondary IP address is tied to the interface, not to the SD-WAN status. When the SLA is down, the SD-WAN will try to prevent the route from getting installed in the routing table database, but it won't bring the 

interface down.

Note: The SD-WAN rule will not use port 10 to route the traffic.