Add OSPF test for issue 14488

This is a preview that needs further work.

See FRRouting#14488

tests/topotests/ospf_topo2/r1/frr.conf

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+frr version 7.5.1
+frr defaults traditional
+hostname r
+log syslog informational
+service integrated-vtysh-config
+!
+ip router-id 192.0.2.1
+!
+interface eth1
+ ip address 192.0.2.1/32
+ ipv6 address 2001:db8::1/128
+ ip ospf area 0.0.0.0
+ ip ospf dead-interval minimal hello-multiplier 4
+ ip ospf network point-to-point
+ ipv6 ospf6 dead-interval 4
+ ipv6 ospf6 hello-interval 1
+ ipv6 ospf6 network point-to-point
+!
+interface eth2
+ ip address 192.0.2.1/32
+ ipv6 address 2001:db8::1/128
+ ip ospf area 0.0.0.0
+ ip ospf dead-interval minimal hello-multiplier 4
+ ip ospf network point-to-point
+ ipv6 ospf6 dead-interval 4
+ ipv6 ospf6 hello-interval 1
+ ipv6 ospf6 network point-to-point
+!
+interface eth3
+ ip address 192.0.2.1/32
+ ipv6 address 2001:db8::1/128
+ ip ospf area 0.0.0.0
+ ip ospf dead-interval minimal hello-multiplier 4
+ ip ospf network point-to-point
+ ipv6 ospf6 dead-interval 4
+ ipv6 ospf6 hello-interval 1
+ ipv6 ospf6 network point-to-point
+!
+interface lo
+ ip ospf area 0.0.0.0
+ ipv6 ospf6 passive
+!
+router ospf
+ log-adjacency-changes
+ passive-interface default
+ no passive-interface eth1
+ no passive-interface eth2
+ no passive-interface eth3
+!
+router ospf6
+ log-adjacency-changes
+ interface lo area 0.0.0.0
+ interface eth1 area 0.0.0.0
+ interface eth2 area 0.0.0.0
+ interface eth3 area 0.0.0.0
+!
+line vty
+!

tests/topotests/ospf_topo2/r2/frr.conf

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+frr version 7.5.1
+frr defaults traditional
+hostname r
+log syslog informational
+service integrated-vtysh-config
+!
+ip router-id 192.0.2.2
+!
+interface eth1
+ ip address 192.0.2.2/32
+ ipv6 address 2001:db8::2/128
+ ip ospf area 0.0.0.0
+ ip ospf dead-interval minimal hello-multiplier 4
+ ip ospf network point-to-point
+ ipv6 ospf6 dead-interval 4
+ ipv6 ospf6 hello-interval 1
+ ipv6 ospf6 network point-to-point
+!
+interface eth2
+ ip address 192.0.2.2/32
+ ipv6 address 2001:db8::2/128
+ ip ospf area 0.0.0.0
+ ip ospf dead-interval minimal hello-multiplier 4
+ ip ospf network point-to-point
+ ipv6 ospf6 dead-interval 4
+ ipv6 ospf6 hello-interval 1
+ ipv6 ospf6 network point-to-point
+!
+interface eth3
+ ip address 192.0.2.2/32
+ ipv6 address 2001:db8::2/128
+ ip ospf area 0.0.0.0
+ ip ospf dead-interval minimal hello-multiplier 4
+ ip ospf network point-to-point
+ ipv6 ospf6 dead-interval 4
+ ipv6 ospf6 hello-interval 1
+ ipv6 ospf6 network point-to-point
+!
+interface lo
+ ip ospf area 0.0.0.0
+ ipv6 ospf6 passive
+!
+router ospf
+ log-adjacency-changes
+ passive-interface default
+ no passive-interface eth1
+ no passive-interface eth2
+ no passive-interface eth3
+!
+router ospf6
+ log-adjacency-changes
+ interface lo area 0.0.0.0
+ interface eth1 area 0.0.0.0
+ interface eth2 area 0.0.0.0
+ interface eth3 area 0.0.0.0
+!
+line vty
+!

tests/topotests/ospf_topo2/r3/frr.conf

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+frr version 7.5.1
+frr defaults traditional
+hostname r
+log syslog informational
+service integrated-vtysh-config
+!
+ip router-id 192.0.2.3
+!
+interface eth1
+ ip address 192.0.2.3/32
+ ipv6 address 2001:db8::3/128
+ ip ospf area 0.0.0.0
+ ip ospf dead-interval minimal hello-multiplier 4
+ ip ospf network point-to-point
+ ipv6 ospf6 dead-interval 4
+ ipv6 ospf6 hello-interval 1
+ ipv6 ospf6 network point-to-point
+!
+interface eth2
+ ip address 192.0.2.3/32
+ ipv6 address 2001:db8::3/128
+ ip ospf area 0.0.0.0
+ ip ospf dead-interval minimal hello-multiplier 4
+ ip ospf network point-to-point
+ ipv6 ospf6 dead-interval 4
+ ipv6 ospf6 hello-interval 1
+ ipv6 ospf6 network point-to-point
+!
+interface eth3
+ ip address 192.0.2.3/32
+ ipv6 address 2001:db8::3/128
+ ip ospf area 0.0.0.0
+ ip ospf dead-interval minimal hello-multiplier 4
+ ip ospf network point-to-point
+ ipv6 ospf6 dead-interval 4
+ ipv6 ospf6 hello-interval 1
+ ipv6 ospf6 network point-to-point
+!
+interface lo
+ ip ospf area 0.0.0.0
+ ipv6 ospf6 passive
+!
+router ospf
+ log-adjacency-changes
+ passive-interface default
+ no passive-interface eth1
+ no passive-interface eth2
+ no passive-interface eth3
+!
+router ospf6
+ log-adjacency-changes
+ interface lo area 0.0.0.0
+ interface eth1 area 0.0.0.0
+ interface eth2 area 0.0.0.0
+ interface eth3 area 0.0.0.0
+!
+line vty
+!

tests/topotests/ospf_topo2/r4/frr.conf

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+frr version 7.5.1
+frr defaults traditional
+hostname r
+log syslog informational
+service integrated-vtysh-config
+!
+ip router-id 192.0.2.4
+!
+interface eth1
+ ip address 192.0.2.4/32
+ ipv6 address 2001:db8::4/128
+ ip ospf area 0.0.0.0
+ ip ospf dead-interval minimal hello-multiplier 4
+ ip ospf network point-to-point
+ ipv6 ospf6 dead-interval 4
+ ipv6 ospf6 hello-interval 1
+ ipv6 ospf6 network point-to-point
+!
+interface eth2
+ ip address 192.0.2.4/32
+ ipv6 address 2001:db8::4/128
+ ip ospf area 0.0.0.0
+ ip ospf dead-interval minimal hello-multiplier 4
+ ip ospf network point-to-point
+ ipv6 ospf6 dead-interval 4
+ ipv6 ospf6 hello-interval 1
+ ipv6 ospf6 network point-to-point
+!
+interface eth3
+ ip address 192.0.2.4/32
+ ipv6 address 2001:db8::4/128
+ ip ospf area 0.0.0.0
+ ip ospf dead-interval minimal hello-multiplier 4
+ ip ospf network point-to-point
+ ipv6 ospf6 dead-interval 4
+ ipv6 ospf6 hello-interval 1
+ ipv6 ospf6 network point-to-point
+!
+interface lo
+ ip ospf area 0.0.0.0
+ ipv6 ospf6 passive
+!
+router ospf
+ log-adjacency-changes
+ passive-interface default
+ no passive-interface eth1
+ no passive-interface eth2
+ no passive-interface eth3
+!
+router ospf6
+ log-adjacency-changes
+ interface lo area 0.0.0.0
+ interface eth1 area 0.0.0.0
+ interface eth2 area 0.0.0.0
+ interface eth3 area 0.0.0.0
+!
+line vty
+!

tests/topotests/ospf_topo2/test_ospf_topo2.dot

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+graph template {
+    label="ospf_topo2";
+    splines = "line"
+
+    # Routers
+    r1 [
+        shape=doubleoctagon,
+        label="r1\n192.0.2.1\n2001:db8::1",
+        fillcolor="#f08080",
+        style=filled,
+    ];
+    r2 [
+        shape=doubleoctagon,
+        label="r2\n\192.0.2.2\n2001:db8::2",
+        fillcolor="#f08080",
+        style=filled,
+    ];
+    r3 [
+        shape=doubleoctagon,
+        label="r3\n192.0.2.3\n2001:db8::3",
+        fillcolor="#f08080",
+        style=filled,
+    ];
+    r4 [
+        shape=doubleoctagon,
+        label="r4\n192.0.2.4\n2001:db8::4",
+        fillcolor="#f08080",
+        style=filled,
+    ];
+
+    # Connections
+    r1 -- r2 [label="eth1"];
+    r1 -- r2 [label="eth2"];
+
+    r2 -- r3 [label="eth3\neth1"];
+    r1 -- r4 [label="eth3\neth1"];
+
+    r4 -- r3 [label="eth2"];
+    r4 -- r3 [label="eth3"];
+
+    # Group r1 and r2 above, r3 and r4 below
+    { rank=min; r1; r2; }
+    { rank=max; r3; r4; }
+}