[frr]: Implement BGP_MONITORS support (#3545)

Implement support of BGP Monitors

Add changes into minigraph to extract BGP Monitors information. Add new templates for FRR.

dockers/docker-fpm-frr/bgpd.conf.default.j2

@@ -22,6 +22,12 @@ route-map TO_BGP_PEER_V4 permit 100
 !
 route-map TO_BGP_PEER_V6 permit 100
 !
+{% if BGP_MONITORS is defined and BGP_MONITORS|length > 0 %}
+route-map FROM_BGPMON_V4 deny 10
+!
+route-map TO_BGPMON_V4 permit 10
+!
+{% endif %}
 router bgp {{ DEVICE_METADATA['localhost']['bgp_asn'] }}
   bgp log-neighbor-changes
   bgp bestpath as-path multipath-relax
@@ -153,4 +159,24 @@ router bgp {{ DEVICE_METADATA['localhost']['bgp_asn'] }}
 {% endfor %}
 {% endif %}
 {% endblock bgp_peers_with_range %}
+{% block bgp_monitors %}
+{% if BGP_MONITORS is defined and BGP_MONITORS|length > 0 %}
+  neighbor BGPMON_V4 peer-group
+{% for (name, prefix) in LOOPBACK_INTERFACE|pfx_filter %}
+{% if prefix | ipv4 and name == 'Loopback0' %}
+  neighbor BGPMON_V4 update-source {{ prefix | ip }}
+{% endif %}
+{% endfor %}
+  neighbor BGPMON_V4 route-map FROM_BGPMON_V4 in
+  neighbor BGPMON_V4 route-map TO_BGPMON_V4 out
+  neighbor BGPMON_V4 send-community
+  neighbor BGPMON_V4 maximum-prefix 1
+{% for neighbor_addr, bgp_session in BGP_MONITORS.items() %}
+  neighbor {{ neighbor_addr }} remote-as {{ DEVICE_METADATA['localhost']['bgp_asn'] }}
+  neighbor {{ neighbor_addr }} peer-group BGPMON_V4
+  neighbor {{ neighbor_addr }} description {{ bgp_session['name'] }}
+  neighbor {{ neighbor_addr }} activate
+{% endfor %}
+{% endif %}
+{% endblock bgp_monitors %}
 !

src/sonic-config-engine/minigraph.py

@@ -383,8 +383,11 @@ def parse_cpg(cpg, hname):
                         bgp_session = bgp_sessions[peer]
                         if hostname.lower() == bgp_session['name'].lower():
                             bgp_session['asn'] = asn
+
+    bgp_monitors = { key: bgp_sessions[key] for key in bgp_sessions if bgp_sessions[key].has_key('asn') and bgp_sessions[key]['name'] == 'BGPMonitor' }
     bgp_sessions = { key: bgp_sessions[key] for key in bgp_sessions if bgp_sessions[key].has_key('asn') and int(bgp_sessions[key]['asn']) != 0 }
-    return bgp_sessions, myasn, bgp_peers_with_range
+
+    return bgp_sessions, myasn, bgp_peers_with_range, bgp_monitors
 
 
 def parse_meta(meta, hname):
@@ -516,6 +519,7 @@ def parse_xml(filename, platform=None, port_config_file=None):
     u_devices = None
     hwsku = None
     bgp_sessions = None
+    bgp_monitors = []
     bgp_asn = None
     intfs = None
     vlan_intfs = None
@@ -559,7 +563,7 @@ def parse_xml(filename, platform=None, port_config_file=None):
         if child.tag == str(QName(ns, "DpgDec")):
             (intfs, lo_intfs, mvrf, mgmt_intf, vlans, vlan_members, pcs, pc_members, acls, vni) = parse_dpg(child, hostname)
         elif child.tag == str(QName(ns, "CpgDec")):
-            (bgp_sessions, bgp_asn, bgp_peers_with_range) = parse_cpg(child, hostname)
+            (bgp_sessions, bgp_asn, bgp_peers_with_range, bgp_monitors) = parse_cpg(child, hostname)
         elif child.tag == str(QName(ns, "PngDec")):
             (neighbors, devices, console_dev, console_port, mgmt_dev, mgmt_port, port_speed_png, console_ports) = parse_png(child, hostname)
         elif child.tag == str(QName(ns, "UngDec")):
@@ -580,6 +584,7 @@ def parse_xml(filename, platform=None, port_config_file=None):
         'type': current_device['type']
         }}
     results['BGP_NEIGHBOR'] = bgp_sessions
+    results['BGP_MONITORS'] = bgp_monitors
     results['BGP_PEER_RANGE'] = bgp_peers_with_range
     if mgmt_routes:
         # TODO: differentiate v4 and v6

src/sonic-config-engine/tests/sample_output/bgpd_frr.conf

@@ -25,6 +25,10 @@ route-map TO_BGP_PEER_V4 permit 100
 !
 route-map TO_BGP_PEER_V6 permit 100
 !
+route-map FROM_BGPMON_V4 deny 10
+!
+route-map TO_BGPMON_V4 permit 10
+!
 router bgp 65100
   bgp log-neighbor-changes
   bgp bestpath as-path multipath-relax
@@ -114,6 +118,16 @@ router bgp 65100
     neighbor fc00::76 route-map TO_BGP_PEER_V6 out
     maximum-paths 64
   exit-address-family
+  neighbor BGPMON_V4 peer-group
+  neighbor BGPMON_V4 update-source 10.1.0.32
+  neighbor BGPMON_V4 route-map FROM_BGPMON_V4 in
+  neighbor BGPMON_V4 route-map TO_BGPMON_V4 out
+  neighbor BGPMON_V4 send-community
+  neighbor BGPMON_V4 maximum-prefix 1
+  neighbor 10.20.30.40 remote-as 65100
+  neighbor 10.20.30.40 peer-group BGPMON_V4
+  neighbor 10.20.30.40 description BGPMonitor
+  neighbor 10.20.30.40 activate
 !!
 maximum-paths 64
 !

src/sonic-config-engine/tests/simple-sample-graph.xml

@@ -2,6 +2,15 @@
   <CpgDec>
     <IsisRouters xmlns:a="http://schemas.datacontract.org/2004/07/Microsoft.Search.Autopilot.Evolution"/>
     <PeeringSessions>
+       <BGPSession>
+         <StartRouter>switch-t0</StartRouter>
+         <StartPeer>10.1.0.32</StartPeer>
+         <EndRouter>BGPMonitor</EndRouter>
+         <EndPeer>10.20.30.40</EndPeer>
+         <Multihop>30</Multihop>
+         <HoldTime>10</HoldTime>
+         <KeepAliveTime>3</KeepAliveTime>
+      </BGPSession>
       <BGPSession>
         <MacSec>false</MacSec>
         <StartRouter>switch-t0</StartRouter>
@@ -42,6 +51,21 @@
       </BGPSession>
     </PeeringSessions>
     <Routers xmlns:a="http://schemas.datacontract.org/2004/07/Microsoft.Search.Autopilot.Evolution">
+      <a:BGPRouterDeclaration>
+          <a:ASN>0</a:ASN>
+          <a:BgpGroups/>
+          <a:Hostname>BGPMonitor</a:Hostname>
+          <a:Peers>
+              <BGPPeer>
+                  <ElementType>BGPPeer</ElementType>
+                  <Address>10.1.0.32</Address>
+                  <RouteMapIn i:nil="true"/>
+                  <RouteMapOut i:nil="true"/>
+                  <Vrf i:nil="true"/>
+              </BGPPeer>
+          </a:Peers>
+          <a:RouteMaps/>
+      </a:BGPRouterDeclaration>
       <a:BGPRouterDeclaration>
         <a:ASN>65100</a:ASN>
         <a:Hostname>switch-t0</a:Hostname>

src/sonic-config-engine/tests/t0-sample-graph.xml

@@ -2,6 +2,15 @@
   <CpgDec>
     <IsisRouters xmlns:a="http://schemas.datacontract.org/2004/07/Microsoft.Search.Autopilot.Evolution"/>
     <PeeringSessions>
+       <BGPSession>
+         <StartRouter>switch-t0</StartRouter>
+         <StartPeer>10.1.0.32</StartPeer>
+         <EndRouter>BGPMonitor</EndRouter>
+         <EndPeer>10.20.30.40</EndPeer>
+         <Multihop>30</Multihop>
+         <HoldTime>10</HoldTime>
+         <KeepAliveTime>3</KeepAliveTime>
+      </BGPSession>
       <BGPSession>
         <MacSec>false</MacSec>
         <StartRouter>switch-t0</StartRouter>
@@ -80,6 +89,21 @@
       </BGPSession>
     </PeeringSessions>
     <Routers xmlns:a="http://schemas.datacontract.org/2004/07/Microsoft.Search.Autopilot.Evolution">
+      <a:BGPRouterDeclaration>
+          <a:ASN>0</a:ASN>
+          <a:BgpGroups/>
+          <a:Hostname>BGPMonitor</a:Hostname>
+          <a:Peers>
+              <BGPPeer>
+                  <ElementType>BGPPeer</ElementType>
+                  <Address>10.1.0.32</Address>
+                  <RouteMapIn i:nil="true"/>
+                  <RouteMapOut i:nil="true"/>
+                  <Vrf i:nil="true"/>
+              </BGPPeer>
+          </a:Peers>
+          <a:RouteMaps/>
+      </a:BGPRouterDeclaration>
       <a:BGPRouterDeclaration>
         <a:ASN>65100</a:ASN>
         <a:Hostname>switch-t0</a:Hostname>

src/sonic-config-engine/tests/test_cfggen.py

@@ -260,3 +260,9 @@ class TestCfgGen(TestCase):
         argument = '-m "' + self.sample_graph_simple + '" -p "' + self.port_config + '" -v "VXLAN_TUNNEL"'
         output = self.run_script(argument)
         self.assertEqual(output.strip(), "")
+
+    def test_minigraph_bgp_mon(self):
+        argument = '-m "' + self.sample_graph_simple + '" -p "' + self.port_config + '" -v "BGP_MONITORS"'
+        output = self.run_script(argument)
+        self.assertEqual(output.strip(), "{'10.20.30.40': {'rrclient': 0, 'name': 'BGPMonitor', 'local_addr': '10.1.0.32', 'nhopself': 0, 'holdtime': '10', 'asn': '0', 'keepalive': '3'}}")
+

src/sonic-config-engine/tests/test_minigraph_case.py

@@ -135,3 +135,9 @@ class TestCfgGenCaseInsensitive(TestCase):
         argument = '-m "' + self.sample_graph + '" -p "' + self.port_config + '" -v "VXLAN_TUNNEL"'
         output = self.run_script(argument)
         self.assertEqual(output.strip(), "")
+
+    def test_minigraph_bgp_mon(self):
+        argument = '-m "' + self.sample_graph + '" -p "' + self.port_config + '" -v "BGP_MONITORS"'
+        output = self.run_script(argument)
+        self.assertEqual(output.strip(), "{}")
+