topotests: add vpn test to control aggregated prefix is exported

Add a test in bgp_vpnv4_ebgp test to control that the aggregated prefix
is exported and selected as a VPN prefix.

Signed-off-by: Philippe Guibert <philippe.guibert@6wind.com>

tests/topotests/bgp_vpnv4_ebgp/r1/bgpd.conf

@@ -15,8 +15,10 @@ router bgp 65500
 !
 router bgp 65500 vrf vrf1
  bgp router-id 192.0.2.1
+ neighbor 172.31.2.100 remote-as 65500
  address-family ipv4 unicast
   redistribute connected
+  aggregate-address 172.31.1.0/24
   label vpn export 101
   rd vpn export 444:1
   rt vpn both 52:100

tests/topotests/bgp_vpnv4_ebgp/r1/show_bgp_ipv4_172_31_1_0.json

@@ -0,0 +1,52 @@
+{   
+  "444:1":{
+    "prefix":"172.31.1.0/24",
+    "advertisedTo":{
+      "192.168.0.2":{
+        "hostname":"r2"
+      },
+      "192.168.0.3":{
+        "hostname":"r3"
+      }
+    },
+    "paths":[
+      {
+        "aspath":{
+          "string":"Local",
+          "segments":[
+          ],
+          "length":0
+        },
+        "aggregatorAs":65500,
+        "aggregatorId":"192.0.2.1",
+        "nhVrfName":"vrf1",
+        "announceNexthopSelf":true,
+        "origin":"incomplete",
+        "metric":0,
+        "weight":32768,
+        "valid":true,
+        "sourced":true,
+        "local":true,
+        "atomicAggregate":true,
+        "bestpath":{
+          "overall":true,
+          "selectionReason":"First path received"
+        },
+        "originatorId":"192.0.2.1",
+        "nexthops":[
+          {
+            "ip":"0.0.0.0",
+            "afi":"ipv4",
+            "metric":0,
+            "accessible":true,
+            "used":true
+          }
+        ],
+        "peer":{
+          "peerId":"0.0.0.0",
+          "routerId":"192.0.2.1"
+        }
+      }
+    ]
+  }
+}

tests/topotests/bgp_vpnv4_ebgp/r1/zebra.conf

@@ -1,6 +1,10 @@
 log stdout
 interface r1-eth1 vrf vrf1
  ip address 172.31.0.1/32
+ ip address 172.31.1.1/32
+ ip address 172.31.1.2/32
+ ip address 172.31.1.3/32
+ ip address 172.31.2.1/24
 !
 interface r1-eth0
  ip address 192.168.0.1/24

tests/topotests/bgp_vpnv4_ebgp/r100/bgpd.conf

@@ -0,0 +1,6 @@
+router bgp 65500
+ bgp router-id 192.0.2.100
+ neighbor 172.31.2.1 remote-as 65500
+ address-family ipv4 unicast
+ exit-address-family
+exit

tests/topotests/bgp_vpnv4_ebgp/r100/show_bgp_ipv4.json

@@ -0,0 +1,147 @@
+{
+ "vrfId": 0,
+ "vrfName": "default",
+ "routerId": "192.0.2.100",
+ "defaultLocPrf": 100,
+ "localAS": 65500,
+    "routes": {
+        "172.31.0.1/32": [{
+            "valid":true,
+            "bestpath":true,
+            "selectionReason":"First path received",
+            "pathFrom":"internal",
+            "prefix":"172.31.0.1",
+            "prefixLen":32,
+            "network":"172.31.0.1/32",
+            "metric":0,
+            "locPrf":100,
+            "weight":0,
+            "peerId":"172.31.2.1",
+            "origin":"incomplete",
+            "nexthops":[{
+                "ip":"172.31.2.1",
+                "afi":"ipv4",
+                "used":true
+            }]
+        }],
+        "172.31.0.10/32": [{
+            "valid":true,
+            "bestpath":true,
+            "selectionReason":"First path received",
+            "pathFrom":"internal",
+            "prefix":"172.31.0.10",
+            "prefixLen":32,
+            "network":"172.31.0.10/32",
+            "metric":0,
+            "locPrf":100,
+            "weight":0,
+            "peerId":"172.31.2.1",
+            "path":"65501",
+            "origin":"incomplete",
+            "nexthops":[{
+                "ip":"172.31.2.1",
+                "afi":"ipv4",
+                "used":true
+            }]
+        }],
+        "172.31.1.0/24": [{
+            "valid":true,
+            "bestpath":true,
+            "selectionReason":"First path received",
+            "pathFrom":"internal",
+            "prefix":"172.31.1.0",
+            "prefixLen":24,
+            "network":"172.31.1.0/24",
+            "metric":0,
+            "locPrf":100,
+            "weight":0,
+            "peerId":"172.31.2.1",
+            "path":"",
+            "origin":"incomplete",
+            "nexthops":[{
+                "ip":"172.31.2.1",
+                "afi":"ipv4",
+                "used":true
+            }]
+        }],
+        "172.31.1.1/32": [{
+            "valid":true,
+            "bestpath":true,
+            "selectionReason":"First path received",
+            "pathFrom":"internal",
+            "prefix":"172.31.1.1",
+            "prefixLen":32,
+            "network":"172.31.1.1/32",
+            "metric":0,
+            "locPrf":100,
+            "weight":0,
+            "peerId":"172.31.2.1",
+            "path":"",
+            "origin":"incomplete",
+            "nexthops":[{
+                "ip":"172.31.2.1",
+                "afi":"ipv4",
+                "used":true}]
+        }],
+        "172.31.1.2/32": [{
+            "valid":true,
+            "bestpath":true,
+            "selectionReason":"First path received",
+            "pathFrom":"internal",
+            "prefix":"172.31.1.2",
+            "prefixLen":32,
+            "network":"172.31.1.2/32",
+            "metric":0,
+            "locPrf":100,
+            "weight":0,
+            "peerId":"172.31.2.1",
+            "path":"",
+            "origin":"incomplete",
+            "nexthops":[{
+                "ip":"172.31.2.1",
+                "afi":"ipv4",
+                "used":true}]
+        }],
+        "172.31.1.3/32": [{
+            "valid":true,
+            "bestpath":true,
+            "selectionReason":"First path received",
+            "pathFrom":"internal",
+            "prefix":"172.31.1.3",
+            "prefixLen":32,
+            "network":"172.31.1.3/32",
+            "metric":0,
+            "locPrf":100,
+            "weight":0,
+            "peerId":"172.31.2.1",
+            "path":"",
+            "origin":"incomplete",
+            "nexthops":[{
+                "ip":"172.31.2.1",
+                "afi":"ipv4",
+                "used":true
+            }]
+        }],
+        "172.31.2.0/24": [{
+            "valid":true,
+            "bestpath":true,
+            "selectionReason":"First path received",
+            "pathFrom":"internal",
+            "prefix":"172.31.2.0",
+            "prefixLen":24,
+            "network":"172.31.2.0/24",
+            "metric":0,
+            "locPrf":100,
+            "weight":0,
+            "peerId":"172.31.2.1",
+            "path":"",
+            "origin":"incomplete",
+            "nexthops":[{
+                "ip":"172.31.2.1",
+                "afi":"ipv4",
+                "used":true}]
+        }]
+    } ,
+    "totalRoutes": 7,
+    "totalPaths": 7
+} 

tests/topotests/bgp_vpnv4_ebgp/r100/zebra.conf

@@ -0,0 +1,4 @@
+log stdout
+interface r100-eth0
+ ip address 172.31.2.100/24
+!

tests/topotests/bgp_vpnv4_ebgp/test_bgp_vpnv4_ebgp.py

@@ -45,6 +45,7 @@ def build_topo(tgen):
     tgen.add_router("r1")
     tgen.add_router("r2")
     tgen.add_router("r3")
+    tgen.add_router("r100")
 
     switch = tgen.add_switch("s1")
     switch.add_link(tgen.gears["r1"])
@@ -53,6 +54,7 @@ def build_topo(tgen):
 
     switch = tgen.add_switch("s2")
     switch.add_link(tgen.gears["r1"])
+    switch.add_link(tgen.gears["r100"])
 
     switch = tgen.add_switch("s3")
     switch.add_link(tgen.gears["r2"])
@@ -524,6 +526,54 @@ router bgp 65501
     assert result is None, assertmsg
 
 
+def test_aggregated_route_on_r100():
+    """
+    Check that only aggregated route on r100 is received
+    """
+    tgen = get_topogen()
+    if tgen.routers_have_failure():
+        pytest.skip(tgen.errors)
+
+    r100 = tgen.gears["r100"]
+    logger.info("Checking prefixes list on R100")
+    json_file = "{}/{}/show_bgp_ipv4.json".format(CWD, r100.name)
+
+    expected = json.loads(open(json_file).read())
+    test_func = partial(
+        topotest.router_json_cmp,
+        r100,
+        "show bgp ipv4 json",
+        expected,
+    )
+    _, result = topotest.run_and_expect(test_func, None, count=10, wait=0.5)
+    assertmsg = '"{}" JSON output mismatches'.format(r100.name)
+    assert result is None, assertmsg
+
+
+def test_aggregated_exported_route_on_r1():
+    """
+    Check that the aggregated route 172.31.1.0/24 is exported
+    """
+    tgen = get_topogen()
+    if tgen.routers_have_failure():
+        pytest.skip(tgen.errors)
+
+    r1 = tgen.gears["r1"]
+    logger.info("Checking 172.31.1.0/24 VPN prefix on R1")
+    json_file = "{}/{}/show_bgp_ipv4_172_31_1_0.json".format(CWD, r1.name)
+
+    expected = json.loads(open(json_file).read())
+    test_func = partial(
+        topotest.router_json_cmp,
+        r1,
+        "show bgp ipv4 vpn 172.31.1.0/24 json",
+        expected,
+    )
+    _, result = topotest.run_and_expect(test_func, None, count=10, wait=0.5)
+    assertmsg = '"{}" JSON output mismatches'.format(r1.name)
+    assert result is None, assertmsg
+
+
 def test_memory_leak():
     "Run the memory leak test and report results."
     tgen = get_topogen()