tests: bgp routers with vrf cross import

tests/topotests/bgp_router_vrf_cross_import/r1/frr.conf

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+!
+int r1-eth0
+ ip address 10.255.0.1/24
+!
+vrf D
+exit-vrf
+!
+router bgp 65001 vrf D
+ !
+ bgp router-id 10.255.0.1
+ address-family ipv4 unicast
+  import vrf default
+ exit-address-family
+exit
+!
+router bgp 65001
+ !
+ bgp router-id 10.255.0.1
+ address-family ipv4 unicast
+  import vrf D
+ exit-address-family
+exit
+!

tests/topotests/bgp_router_vrf_cross_import/test_cross_import.py

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+#!/usr/bin/env python
+# SPDX-License-Identifier: ISC
+
+import functools, json, os, pytest, re, sys
+
+CWD = os.path.dirname(os.path.realpath(__file__))
+sys.path.append(os.path.join(CWD, "../"))
+
+from lib import topotest
+from lib.topogen import Topogen, get_topogen
+
+pytestmark = [pytest.mark.bgpd]
+
+
+def setup_module(mod):
+    topodef = {"s1": ("r1")}
+    tgen = Topogen(topodef, mod.__name__)
+    tgen.start_topology()
+
+    router_list = tgen.routers()
+
+    for _, (rname, router) in enumerate(router_list.items(), 1):
+        router.load_frr_config(
+            os.path.join(CWD, "{}/frr.conf".format(rname))
+        )
+
+    tgen.start_router()
+
+
+def teardown_module(mod):
+    tgen = get_topogen()
+    tgen.stop_topology()
+
+
+def test_bgp_vrf_cross_import():
+    tgen = get_topogen()
+
+    if tgen.routers_have_failure():
+        pytest.skip(tgen.errors)
+
+    r1 = tgen.gears["r1"]
+
+    def _bgp_router_vrf_custom():
+        output = json.loads(
+            r1.vtysh_cmd("show bgp vrf D detail json")
+        )
+        expected = {
+	    "vrfName": "D",
+            "localAS": 65001
+        }
+
+        return topotest.json_cmp(output, expected)
+
+    test_func = functools.partial(
+        _bgp_router_vrf_custom,
+    )
+    _, result = topotest.run_and_expect(test_func, None, count=30, wait=1)
+    assert result is None, "bgp router 65001 vrf D failed"
+
+    def _bgp_router_vrf_default():
+        output = json.loads(
+            r1.vtysh_cmd("show bgp detail json")
+        )
+        expected = {
+	    "vrfName": "default",
+            "localAS": 65001
+        }
+
+        return topotest.json_cmp(output, expected)
+
+    test_func = functools.partial(
+        _bgp_router_vrf_default,
+    )
+    _, result = topotest.run_and_expect(test_func, None, count=30, wait=1)
+    assert result is None, "bgp router 65001 failed in default vrf"
+
+if __name__ == "__main__":
+    args = ["-s"] + sys.argv[1:]
+    sys.exit(pytest.main(args))