ripd: fix ip rip send/receive version command

Now the vtysh will reject illegal command `ip rip send/receive version 2 1`, instead accept command `ip rip send/receive version 1 2` as shown in doc.
Add topotest `rip_send_recv_version` test.
Signed-off-by: Shbinging <bingshui@smail.nju.edu.cn>

ripd/rip_cli.c

@@ -744,18 +744,20 @@ void cli_show_ip_rip_v2_broadcast(struct vty *vty, const struct lyd_node *dnode,
  */
 DEFPY_YANG (ip_rip_receive_version,
        ip_rip_receive_version_cmd,
-       "ip rip receive version <{1$v1|2$v2}|none>",
+       "ip rip receive version <1$v1|2$v2|1 2$v3|none>",
        IP_STR
        "Routing Information Protocol\n"
        "Advertisement reception\n"
        "Version control\n"
        "RIP version 1\n"
        "RIP version 2\n"
+	   "RIP version 1&2\n"
+	   "RIP version 1&2\n"
        "None\n")
 {
 	const char *value;
 
-	if (v1 && v2)
+	if (v3)
 		value = "both";
 	else if (v1)
 		value = "1";
@@ -814,18 +816,20 @@ void cli_show_ip_rip_receive_version(struct vty *vty,
  */
 DEFPY_YANG (ip_rip_send_version,
        ip_rip_send_version_cmd,
-       "ip rip send version <{1$v1|2$v2}|none>",
+       "ip rip send version <1$v1|2$v2|1 2$v3|none>",
        IP_STR
        "Routing Information Protocol\n"
        "Advertisement transmission\n"
        "Version control\n"
        "RIP version 1\n"
        "RIP version 2\n"
+	   "RIP version 1&2\n"
+	   "RIP version 1&2\n"
        "None\n")
 {
 	const char *value;
 
-	if (v1 && v2)
+	if (v3)
 		value = "both";
 	else if (v1)
 		value = "1";

tests/topotests/rip_send_recv_version/r1/frr.conf

@@ -0,0 +1,17 @@
+!
+int r1-eth0
+ ip address 192.168.1.1/24
+ ip rip send version 2 1
+ ip rip receive version 2 1
+!
+
+!
+int r1-eth1
+  ip address 192.168.1.2/24
+  ip rip send version 1 2
+  ip rip receive version 1 2
+!
+router rip
+ network r1-eth0
+ network r1-eth1
+exit

tests/topotests/rip_send_recv_version/test_rip_send_recv_version.py

@@ -0,0 +1,79 @@
+#!/usr/bin/env python
+# SPDX-License-Identifier: ISC
+
+# Copyright (c) 2025 by
+# Bing Shui <bingshui@smail.nju.edu.cn>
+#
+
+"""
+Test if RIP `ip rip send version` and `ip rip receive version` 
+works as expected.
+"""
+
+import os
+import sys
+import json
+import pytest
+import functools
+import re
+
+CWD = os.path.dirname(os.path.realpath(__file__))
+sys.path.append(os.path.join(CWD, "../"))
+
+# pylint: disable=C0413
+from lib import topotest
+from lib.topogen import Topogen, get_topogen
+from lib.common_config import step
+
+pytestmark = [pytest.mark.ripd]
+
+
+def setup_module(mod):
+    topodef = {"s1": ("r1")}
+    tgen = Topogen(topodef, mod.__name__)
+    tgen.start_topology()
+
+    router_list = tgen.routers()
+
+    for _, (rname, router) in enumerate(router_list.items(), 1):
+        router.load_frr_config(os.path.join(CWD, "{}/frr.conf".format(rname)))
+
+    tgen.start_router()
+
+
+def teardown_module():
+    tgen = get_topogen()
+    tgen.stop_topology()
+
+
+def get_conf_of_interface(i_name, text):
+    pattern = f'!\ninterface {i_name}(.*?)!'
+
+    matches = re.findall(pattern, text, re.DOTALL)
+
+    for match in matches:
+        return match.strip()
+    
+    return None
+
+def test_rip_version():
+    tgen = get_topogen()
+
+    if tgen.routers_have_failure():
+        pytest.skip(tgen.errors)
+
+    r1 = tgen.gears["r1"]
+
+    st = r1.vtysh_cmd("show running-config")
+    r1_eth0 = get_conf_of_interface("r1-eth0", st)
+    assert r1_eth0 != None
+    assert "ip rip send version 1 2" not in r1_eth0
+    assert "ip rip receive version 1 2" not in r1_eth0
+    r1_eth1 = get_conf_of_interface("r1-eth1", st)
+    assert r1_eth1 != None
+    assert "ip rip send version 1 2" in r1_eth1
+    assert "ip rip receive version 1 2" in r1_eth1
+
+if __name__ == "__main__":
+    args = ["-s"] + sys.argv[1:]
+    sys.exit(pytest.main(args))