BGPSpeaker: Suppress RD in EVPN VRF on SSH console

Because the NLRI_CLASS of the VRF EVPN Table is the same as the
NLRI_CLASS of the Global EVPN Table, the str representation can not
be distinguished with 'formatted_nlri_str' format.
So, 'show vrf' commands on the SSH console returns the str outputs
with Route Distinguisher (RD) even if the route on the VRF Table
can be identified without RD value.

This patch implements the str representation properties to output
BGP routes on SSH console.

Current: RD '65001:100' is duplicated
  bgpd> show vrf all
  VPN: ('65001:100', 'evpn')
   *>  65001💯multicast_etag(ethernet_tag_id:300,ip_addr:10.10.1.0) None     0.0.0.0              Only Path                     ?

With this patch:
  bgpd> show vrf all
  VPN: ('65001:100', 'evpn')
   *>  multicast_etag(ethernet_tag_id:300,ip_addr:10.10.1.0) None     0.0.0.0              Only Path                     ?

Signed-off-by: IWASE Yusuke <iwase.yusuke0@gmail.com>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>

ryu/services/protocols/bgp/info_base/base.py

@@ -336,6 +336,10 @@ class Destination(object):
     def nlri(self):
         return self._nlri
 
+    @property
+    def nlri_str(self):
+        return self._nlri.formatted_nlri_str
+
     @property
     def best_path(self):
         return self._best_path
@@ -777,6 +781,10 @@ class Path(object):
     def nlri(self):
         return self._nlri
 
+    @property
+    def nlri_str(self):
+        return self._nlri.formatted_nlri_str
+
     @property
     def is_withdraw(self):
         return self._is_withdraw

ryu/services/protocols/bgp/info_base/vrf.py

@@ -299,6 +299,13 @@ class VrfDest(Destination):
         super(VrfDest, self).__init__(table, nlri)
         self._route_dist = self._table.vrf_conf.route_dist
 
+    @property
+    def nlri_str(self):
+        # Returns `prefix` without the route distinguisher value, because
+        # a destination in VRF space can be identified without the route
+        # distinguisher.
+        return self._nlri.prefix
+
     def _best_path_lost(self):
         # Have to send update messages for withdraw of best-path to Network
         # controller or Global table.
@@ -483,6 +490,13 @@ class VrfPath(Path):
     def label_list(self):
         return self._label_list[:]
 
+    @property
+    def nlri_str(self):
+        # Returns `prefix` without the route distinguisher value, because
+        # a destination in VRF space can be identified without the route
+        # distinguisher.
+        return self._nlri.prefix
+
     @staticmethod
     def create_puid(route_dist, ip_prefix):
         assert route_dist and ip_prefix

ryu/services/protocols/bgp/operator/internal_api.py

@@ -101,7 +101,7 @@ class InternalApi(object):
 
     def _dst_to_dict(self, dst):
         ret = {'paths': [],
-               'prefix': dst.nlri.formatted_nlri_str}
+               'prefix': dst.nlri_str}
 
         def _path_to_dict(dst, path):
 
@@ -143,7 +143,7 @@ class InternalApi(object):
 
             return {'best': (path == dst.best_path),
                     'bpr': bpr,
-                    'prefix': path.nlri.formatted_nlri_str,
+                    'prefix': path.nlri_str,
                     'labels': labels,
                     'nexthop': nexthop,
                     'metric': med,