ospf: add point-to-multipoint and hybrid interface type support

Author: mattiaswal

doc/routing.md

@@ -131,6 +131,66 @@ an Ethernet interface can be done as follows.
 admin@example:/config/routing/…/ospf/area/0.0.0.0/interface/e0/>
 </code></pre>
 
+
+### Point-to-Multipoint
+
+Point-to-Multipoint (P2MP) is used when multiple OSPF routers share a
+common network segment but should form individual adjacencies rather
+than electing a Designated Router (DR).  This is common in NBMA-like
+environments, DMVPN, or hub-and-spoke topologies.
+
+Infix supports two P2MP variants via the `interface-type` setting:
+
+| **Interface Type**    | **Behavior**                                   |
+|:----------------------|:-----------------------------------------------|
+| `hybrid`              | P2MP with multicast Hellos (broadcast-capable) |
+| `point-to-multipoint` | P2MP with unicast Hellos (non-broadcast)       |
+
+#### Hybrid (broadcast-capable P2MP)
+
+Use `hybrid` when all neighbors on the segment can receive multicast.
+Hello packets are sent to the standard OSPF multicast address (224.0.0.5)
+and neighbors are discovered automatically — no manual neighbor
+configuration is needed.
+
+<pre class="cli"><code>admin@example:/config/> <b>edit routing control-plane-protocol ospfv2 name default ospf</b>
+admin@example:/config/routing/…/ospf/> <b>set area 0.0.0.0 interface e0 interface-type hybrid</b>
+admin@example:/config/routing/…/ospf/> <b>leave</b>
+admin@example:/>
+</code></pre>
+
+#### Non-broadcast P2MP
+
+Use `point-to-multipoint` when the network does not support multicast.
+Hello packets are sent as unicast directly to each configured neighbor.
+Since neighbors cannot be discovered automatically, they must be
+configured explicitly using static neighbors (see below).
+
+<pre class="cli"><code>admin@example:/config/> <b>edit routing control-plane-protocol ospfv2 name default ospf</b>
+admin@example:/config/routing/…/ospf/> <b>set area 0.0.0.0 interface e0 interface-type point-to-multipoint</b>
+admin@example:/config/routing/…/ospf/> <b>leave</b>
+admin@example:/>
+</code></pre>
+
+
+### Static Neighbors
+
+When using non-broadcast interface types (such as `point-to-multipoint`),
+OSPF cannot discover neighbors via multicast.  Static neighbors must be
+configured so the router knows where to send unicast Hello packets.
+
+<pre class="cli"><code>admin@example:/config/> <b>edit routing control-plane-protocol ospfv2 name default ospf</b>
+admin@example:/config/routing/…/ospf/> <b>set area 0.0.0.0 interface e0 static-neighbors neighbor 10.0.123.2</b>
+admin@example:/config/routing/…/ospf/> <b>set area 0.0.0.0 interface e0 static-neighbors neighbor 10.0.123.3</b>
+admin@example:/config/routing/…/ospf/> <b>leave</b>
+admin@example:/>
+</code></pre>
+
+> [!NOTE]
+> Static neighbors are only needed for non-broadcast interface types.
+> With `hybrid` (or `broadcast`), neighbors are discovered automatically
+> via multicast.
+
 ### OSPF global settings
 
 In addition to *area* and *interface* specific settings, OSPF provides

src/confd/src/routing.c

@@ -154,6 +154,17 @@ int parse_rip(sr_session_ctx_t *session, struct lyd_node *rip, FILE *fp)
 	return num_interfaces;
 }
 
+static const char *ospf_network_type(const char *yang_type)
+{
+	if (!strcmp(yang_type, "hybrid"))
+		return "point-to-multipoint";
+	if (!strcmp(yang_type, "point-to-multipoint"))
+		return "point-to-multipoint non-broadcast";
+
+	/* broadcast, non-broadcast, point-to-point pass through unchanged */
+	return yang_type;
+}
+
 int parse_ospf_interfaces(sr_session_ctx_t *session, struct lyd_node *areas, FILE *fp)
 {
 	struct lyd_node *interface, *interfaces, *area;
@@ -203,7 +214,7 @@ int parse_ospf_interfaces(sr_session_ctx_t *session, struct lyd_node *areas, FIL
 				if (passive)
 					fputs("  ip ospf passive\n", fp);
 				if (interface_type)
-					fprintf(fp, "  ip ospf network %s\n", interface_type);
+					fprintf(fp, "  ip ospf network %s\n", ospf_network_type(interface_type));
 				if (cost)
 					fprintf(fp, "  ip ospf cost %s\n", cost);
 			}
@@ -226,6 +237,28 @@ int parse_ospf_redistribute(sr_session_ctx_t *session, struct lyd_node *redistri
 	return 0;
 }
 
+static void parse_ospf_static_neighbors(struct lyd_node *areas, FILE *fp)
+{
+	struct lyd_node *area, *interface, *interfaces, *neighbors, *neighbor;
+
+	LY_LIST_FOR(lyd_child(areas), area) {
+		interfaces = lydx_get_child(area, "interfaces");
+
+		LY_LIST_FOR(lyd_child(interfaces), interface) {
+			neighbors = lydx_get_child(interface, "static-neighbors");
+			if (!neighbors)
+				continue;
+
+			LY_LIST_FOR(lyd_child(neighbors), neighbor) {
+				const char *id = lydx_get_cattr(neighbor, "identifier");
+
+				if (id)
+					fprintf(fp, "  neighbor %s\n", id);
+			}
+		}
+	}
+}
+
 int parse_ospf_areas(sr_session_ctx_t *session, struct lyd_node *areas, FILE *fp)
 {
 	int areas_configured = 0;
@@ -315,6 +348,7 @@ int parse_ospf(sr_session_ctx_t *session, struct lyd_node *ospf)
 	fputs("router ospf\n", fp);
 	num_areas = parse_ospf_areas(session, areas, fp);
 	parse_ospf_redistribute(session, lydx_get_child(ospf, "redistribute"), fp);
+	parse_ospf_static_neighbors(areas, fp);
 	default_route = lydx_get_child(ospf, "default-route-advertise");
 	if (default_route) {
 		/* enable is obsolete in favor for enabled. */

src/confd/yang/confd.inc

@@ -14,7 +14,7 @@ MODULES=(
 	"ietf-routing@2018-03-13.yang"
 	"ietf-ipv6-unicast-routing@2018-03-13.yang"
 	"ietf-ipv4-unicast-routing@2018-03-13.yang"
-	"ietf-ospf@2022-10-19.yang -e bfd -e explicit-router-id"
+	"ietf-ospf@2022-10-19.yang -e bfd -e explicit-router-id -e hybrid-interface"
 	"ietf-rip@2020-02-20.yang"
 	"iana-bfd-types@2021-10-21.yang"
 	"ietf-bfd-types@2022-09-22.yang"

src/confd/yang/confd/infix-routing.yang

@@ -26,6 +26,12 @@ module infix-routing {
   contact      "kernelkit@googlegroups.com";
   description  "Deviations and augments for ietf-routing, ietf-ospf, and ietf-rip.";
 
+  revision 2026-03-04 {
+    description "Remove interface-type deviation to expose standard ietf-ospf
+                 interface types including point-to-multipoint and hybrid.
+                 Un-deviate static-neighbors for non-broadcast P2MP support.";
+  }
+
   revision 2025-12-02 {
     description "Add configurable OSPF debug logging container.
                  Add RIP (Routing Information Protocol) support.";
@@ -247,18 +253,6 @@ module infix-routing {
   }
 
   /* OSPF */
-  typedef infix-ospf-interface-type {
-    type enumeration {
-      enum broadcast {
-        description
-          "Specifies an OSPF broadcast multi-access network.";
-      }
-      enum point-to-point {
-        description
-          "Specifies an OSPF point-to-point network.";
-      }
-    }
-  }
 
 
   deviation "/rt:routing/rt:control-plane-protocols/rt:control-plane-protocol" {
@@ -367,11 +361,6 @@ module infix-routing {
     }
   }
 
-  deviation "/rt:routing/rt:control-plane-protocols/rt:control-plane-protocol/ospf:ospf/ospf:areas/ospf:area/ospf:interfaces/ospf:interface/ospf:interface-type" {
-    deviate replace {
-      type infix-ospf-interface-type;
-    }
-  }
 
   deviation "/rt:routing/rt:control-plane-protocols/rt:control-plane-protocol/ospf:ospf/ospf:auto-cost" {
     deviate not-supported;
@@ -463,10 +452,6 @@ module infix-routing {
   }
 
   /* OSPF Area Interface */
-  deviation "/rt:routing/rt:control-plane-protocols/rt:control-plane-protocol/ospf:ospf/ospf:areas/ospf:area/ospf:interfaces/ospf:interface/ospf:static-neighbors"
-  {
-    deviate not-supported;
-  }
   deviation "/rt:routing/rt:control-plane-protocols/rt:control-plane-protocol/ospf:ospf/ospf:areas/ospf:area/ospf:interfaces/ospf:interface/ospf:multi-areas"    {
     deviate not-supported;
   }

…yang/confd/infix-routing@2025-12-02.yang …yang/confd/infix-routing@2026-03-04.yangsrc/confd/yang/confd/infix-routing@2025-12-02.yang renamed to src/confd/yang/confd/infix-routing@2026-03-04.yang src/confd/yang/confd/infix-routing@2025-12-02.yang renamed to src/confd/yang/confd/infix-routing@2026-03-04.yang

@@ -4838,7 +4838,7 @@ def show_ospf_interfaces(json_data):
         state = target_iface.get('state', 'down')
         cost = target_iface.get('cost', 0)
         priority = target_iface.get('priority', 1)
-        iface_type = target_iface.get('interface-type', 'unknown')
+        iface_type = target_iface.get('interface-type', '')
         hello_interval = target_iface.get('hello-interval', 10)
         dead_interval = target_iface.get('dead-interval', 40)
         retransmit_interval = target_iface.get('retransmit-interval', 5)
@@ -4914,9 +4914,11 @@ def show_ospf_interfaces(json_data):
         network_type_map = {
             'point-to-point': 'POINTOPOINT',
             'broadcast': 'BROADCAST',
-            'non-broadcast': 'NBMA'
+            'non-broadcast': 'NBMA',
+            'point-to-multipoint': 'POINTOMULTIPOINT',
+            'hybrid': 'POINTOMULTIPOINT'
         }
-        network_type = network_type_map.get(iface_type, iface_type.upper())
+        network_type = network_type_map.get(iface_type, iface_type.upper() if iface_type else 'LOOPBACK')
 
         print(f"{name} is up")
         if ip_address:
@@ -4956,30 +4958,50 @@ def show_ospf_interfaces(json_data):
         return
 
     # Display table view (no specific interface)
-    hdr = f"{'INTERFACE':<12} {'AREA':<12} {'STATE':<10} {'COST':<6} {'PRI':<4} {'DR':<15} {'BDR':<15} {'NBRS':<5}"
-    print(Decore.invert(hdr))
+    type_display_map = {
+        'point-to-point': 'P2P',
+        'broadcast': 'Broadcast',
+        'non-broadcast': 'NBMA',
+        'point-to-multipoint': 'P2MP',
+        'hybrid': 'Hybrid'
+    }
+
+    def fmt_state(state):
+        if state in ('dr', 'bdr'):
+            return state.upper()
+        if state == 'dr-other':
+            return 'DROther'
+        return state.capitalize()
+
+    table = SimpleTable([
+        Column('INTERFACE'),
+        Column('AREA'),
+        Column('TYPE'),
+        Column('STATE'),
+        Column('COST', 'right'),
+        Column('PRI', 'right'),
+        Column('DR'),
+        Column('BDR'),
+        Column('NBRS', 'right')
+    ])
 
     for iface in all_interfaces:
         name = iface.get('name', 'unknown')
         area_id = iface.get('_area_id', '0.0.0.0')
         state = iface.get('state', 'down')
+        iface_type = iface.get('interface-type', '')
         cost = iface.get('cost', 0)
         priority = iface.get('priority', 1)
         dr_id = iface.get('dr-router-id', '-')
         bdr_id = iface.get('bdr-router-id', '-')
         neighbors = iface.get('neighbors', {}).get('neighbor', [])
-        nbr_count = len(neighbors)
 
-        # Capitalize state nicely
-        state_display = state.upper() if state in ['dr', 'bdr'] else state.capitalize()
-        if state == 'dr-other':
-            state_display = 'DROther'
-
-        # Shorten router IDs for display
-        dr_display = dr_id if dr_id != '-' else '-'
-        bdr_display = bdr_id if bdr_id != '-' else '-'
+        table.row(name, area_id,
+                  type_display_map.get(iface_type, iface_type.capitalize() if iface_type else '-'),
+                  fmt_state(state),
+                  cost, priority, dr_id, bdr_id, len(neighbors))
 
-        print(f"{name:<12} {area_id:<12} {state_display:<10} {cost:<6} {priority:<4} {dr_display:<15} {bdr_display:<15} {nbr_count:<5}")
+    table.print()
 
 
 def show_ospf_neighbor(json_data):

src/statd/python/cli_pretty/cli_pretty.py

@@ -124,8 +124,15 @@ def add_areas(control_protocols):
             interface["enabled"] = iface["ospfEnabled"]
             if iface["networkType"] == "POINTOPOINT":
                 interface["interface-type"] = "point-to-point"
-            if iface["networkType"] == "BROADCAST":
+            elif iface["networkType"] == "BROADCAST":
                 interface["interface-type"] = "broadcast"
+            elif iface["networkType"] == "POINTOMULTIPOINT":
+                if iface.get("p2mpNonBroadcast", False):
+                    interface["interface-type"] = "point-to-multipoint"
+                else:
+                    interface["interface-type"] = "hybrid"
+            elif iface["networkType"] == "NBMA":
+                interface["interface-type"] = "non-broadcast"
 
             if iface.get("state"):
                 # Wev've never seen "DependUpon", and has no entry in

src/statd/python/yanger/ietf_ospf.py

@@ -10,6 +10,8 @@ Tests verifying standard routing protocols and configuration:
  - OSPF with BFD (Bidirectional Forwarding Detection)
  - OSPF default route advertisement and propagation
  - OSPF debug logging configuration and verification
+ - OSPF point-to-multipoint hybrid (broadcast) interface type
+ - OSPF point-to-multipoint (non-broadcast) interface type with static neighbors
  - RIP basic neighbor discovery and route exchange
  - RIP passive interface configuration
  - RIP route redistribution (connected, static, and OSPF)
@@ -46,6 +48,14 @@ include::ospf_debug/Readme.adoc[]
 
 <<<
 
+include::ospf_point_to_multipoint_hybrid/Readme.adoc[]
+
+<<<
+
+include::ospf_point_to_multipoint/Readme.adoc[]
+
+<<<
+
 include::rip_basic/Readme.adoc[]
 
 <<<

test/case/routing/Readme.adoc

@@ -29,6 +29,12 @@
 - name: OSPF Debug Logging
   case: ospf_debug/test.py
 
+- name: OSPF Point-to-Multipoint Hybrid
+  case: ospf_point_to_multipoint_hybrid/test.py
+
+- name: OSPF Point-to-Multipoint
+  case: ospf_point_to_multipoint/test.py
+
 - name: RIP Basic
   case: rip_basic/test.py