How to config a ospf stub area?

[chan alfie]

Hi,

+-----------------------+  +-------------------+   +-------------------+   +---------------------- - +
|         172.16.34.0/30   \  /   172.16.45.0/30    \  /    172.16.56.0/30    \ /   172.16.67.0/30            |
| rt3 --------------------- rt4 ------------------- rt5 --------------------- rt6 ------------------- rt7 |
|        area 172.16.34.0  /  \    area 0.0.0.0        /  \   area 172.16.56.0   / \                                      |
+-----------------------+  +-------------------+  +----- ---------------+ + ------------------------+
                                    OSPF                                                    RIP

I would like to config area 172.16.34.0 as a stub area, here is my config:

```
rt3.conf
protocol ospf v2 {
    ipv4 { import all; export all; };
    area 172.16.34.0 {
      stub yes;
        interface "veth34" {
            type bcast;     # Detected by default
            cost 10;        # Interface metric
            hello 10;       # Default hello perid 10 is too long
        };
        interface "lo3" {
            stub yes;
        };
    };
}
```

rt4.conf
```
protocol ospf v2 {
    ipv4 { import all; export all; };
    area 172.16.34.0 {
      stub yes;
        interface "veth43" {
            type bcast;     # Detected by default
            cost 10;        # Interface metric
            hello 10;       # Default hello perid 10 is too long
        };
        interface "lo3" {
            stub yes;
        };
    };
    area 0.0.0.0 {
      ...
    }
}
```

rt3
```
rt3# bird -c /etc/bird/lab/rt3.conf -p
bird: /etc/bird/lab/rt3.conf:173:1 ASBR must be in non-stub area
```

rt4
```
rt4# bird -c /etc/bird/lab/rt4.conf -p
rt4# birdc -s /run/bird/rt4.pid configure
```

after that

rt4
```
bird> show ospf lsadb
...
area 172.16.34.0

        router 172.16.8.4
                distance 0
                stubnet 172.16.34.0/30 metric 10
                xnetwork 0.0.0.0/0 metric 1000

bird> show ospf lsadb area 172.16.34.0
Area 172.16.34.0
 Type   LS ID           Router          Sequence   Age  Checksum
 0001  172.16.8.4      172.16.8.4       80000019   616    067e
 0003  0.0.0.0         172.16.8.4       80000001   621    1753
```

rt3
```
bird> show ospf lsadb area 172.16.34.0

Area 172.16.34.0

 Type   LS ID           Router          Sequence   Age  Checksum
 0001  172.16.8.3      172.16.8.3       8000001b   676    1d29
 0001  172.16.8.4      172.16.8.4       80000017  1782    2578
 0004  172.16.8.5      172.16.8.4       80000016  1777    e089
 0004  172.16.8.6      172.16.8.4       80000016  1777    3b24
 0002  172.16.34.2     172.16.8.4       80000016  1782    f5d7
 0003  172.16.45.3     172.16.8.4       80000017  1782    56f3
 0003  172.16.56.3     172.16.8.4       80000016  1777    43f2
 0003  4.8.5.3         172.16.8.4       80000016  1777    67b2
 0003  4.8.5.4         172.16.8.4       80000016  1777    5dbb
 0003  4.8.5.11        172.16.8.4       80000016  1777    17fa
 0003  4.8.5.12        172.16.8.4       80000016  1777    0d04
 0003  4.8.6.3         172.16.8.4       80000003  2017    e63b
 0003  4.8.6.4         172.16.8.4       80000003  2017    dc44
 0003  4.8.6.11        172.16.8.4       80000003  2017    9683
 0003  4.8.6.12        172.16.8.4       80000003  2017    8c8c
bird> show ospf lsadb state
syntax error, unexpected STATE
bird> show ospf state

area 172.16.34.0

        router 172.16.8.3
                distance 0
                stubnet 4.8.3.0/30 metric 10
                stubnet 4.8.3.4/30 metric 10
                stubnet 4.8.3.8/30 metric 10
                stubnet 4.8.3.12/30 metric 10
                stubnet 172.16.34.0/30 metric 10
                stubnet 4.8.3.100/30 metric 10
bird>
```
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