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diff --git a/tests/sys/net/routing/test_routing_l3.py b/tests/sys/net/routing/test_routing_l3.py
--- a/tests/sys/net/routing/test_routing_l3.py
+++ b/tests/sys/net/routing/test_routing_l3.py
@@ -86,6 +86,47 @@
nh = [nh for nh in nhops if nh["index"] == nhop_kidx][0]
assert nh["ifa"] == str(second_addr.ip)
+ @pytest.mark.parametrize("family", ["inet", "inet6"])
+ @pytest.mark.require_user("root")
+ def test_add_address_same_prefix_present(self, family):
+ """
+ Tests adding an interface prefix route when a route with the same
+ prefix is already present in the routing table
+ """
+ vnet = self.vnet_map["vnet1"]
+ first_iface = vnet.iface_alias_map["if1"]
+
+ if family == "inet":
+ first_addr = ipaddress.ip_interface("192.0.2.1/24")
+ else:
+ first_addr = ipaddress.ip_interface("2001:db8::1/64")
+
+ # Add a route pointing to the loopback interface
+ ToolsHelper.print_output(
+ f"route add -net -{family} {first_addr.network} -interface lo0"
+ )
+
+ # Verify the route points to the loopback interface
+ routes = ToolsHelper.get_routes(family)
+ px = [
+ r for r in routes if r["destination"] == str(first_addr.network)
+ ][0]
+ assert px["interface-name"] == "lo0"
+
+ # Add an address to the first interface with the same prefix as the
+ # route, and verify switchover
+ first_iface.setup_addr(str(first_addr))
+
+ routes = ToolsHelper.get_routes(family)
+ px = [
+ r for r in routes if r["destination"] == str(first_addr.network)
+ ][0]
+ nhop_kidx = px["nhop"]
+ assert px["interface-name"] == first_iface.name
+ nhops = ToolsHelper.get_nhops(family)
+ nh = [nh for nh in nhops if nh["index"] == nhop_kidx][0]
+ assert nh["ifa"] == str(first_addr.ip)
+
class TestRouteCornerCase1(SingleVnetTestTemplate):
@pytest.mark.parametrize("family", ["inet", "inet6"])

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