topotato: test bgp dont capability negotiate

Authored-by: Chromico Rek <[email protected]>
Signed-off-by: David Lamparter <[email protected]>

test_bgp_dont_capability_negotiate.py

@@ -0,0 +1,98 @@
+from topotato import *
+
+"""
+Test if BGP connection is established if at least one peer
+sets `dont-capability-negotiate`.
+"""
+
+
+@topology_fixture()
+def allproto_topo(topo):
+    """
+    [ r1 ]
+      |
+    { s1 }
+      |
+    [ r2 ]
+
+    """
+
+    topo.router("r2").lo_ip4.append("172.16.16.1/32")
+    topo.router("r1").iface_to("s1").ip4.append("192.168.1.1/24")
+    topo.router("r2").iface_to("s1").ip4.append("192.168.1.2/24")
+
+
+class Configs(FRRConfigs):
+    routers = ["r1", "r2"]
+
+    zebra = """
+    #% extends "boilerplate.conf"
+    #% block main
+    #%   if router.name == 'r1'
+    interface lo
+     ip address {{ routers.r1.lo_ip4[0] }} 
+    !
+    #%   endif
+    #%   for iface in router.ifaces
+    interface {{ iface.ifname }}
+     ip address {{ iface.ip4[0] }} 
+    !
+    #%   endfor
+    ip forwarding
+    !
+    #% endblock
+    """
+
+    bgpd = """
+  #% block main
+    #%   if router.name == 'r2'
+    router bgp 65002
+      no bgp ebgp-requires-policy
+      neighbor {{ routers.r1.ifaces[0].ip4[0].ip }} remote-as external
+      address-family ipv4 unicast
+      redistribute connected
+      exit-address-family
+    !
+    #%   elif router.name == 'r1'
+    router bgp 65001
+      no bgp ebgp-requires-policy
+      neighbor {{ routers.r2.ifaces[0].ip4[0].ip }} remote-as external
+      neighbor {{ routers.r2.ifaces[0].ip4[0].ip }} dont-capability-negotiate
+    !
+    #%   endif
+  #% endblock
+  """
+
+
+@config_fixture(Configs)
+def configs(config, allproto_topo):
+    return config
+
+
+@instance_fixture()
+def testenv(configs):
+    return FRRNetworkInstance(configs.topology, configs).prepare()
+
+
+class BGPDontCapabilityNegotiate(TestBase):
+    instancefn = testenv
+
+    @topotatofunc
+    def bgp_converge(self, topo, r1, r2):
+        expected = {
+            "peers": {
+                "192.168.1.2": {
+                    "pfxRcd": 2,
+                    "pfxSnt": 2,
+                    "state": "Established",
+                    "peerState": "OK",
+                }
+            }
+        }
+        yield from AssertVtysh.make(
+            r1,
+            "bgpd",
+            f"show bgp ipv4 unicast summary json",
+            maxwait=5.0,
+            compare=expected,
+        )