How to make ospf advertise stubnet base on the interface/subnet state?

[Bernd Naumann]

Hey,

It's just a wild guess, but did you tried:

```
protocol ospf [v2|v3] <name> {
  ...
  interface <interface pattern> [instance <num>] {
    check link <switch>;
  };
  ..
}
```

I'm not sure if or what difference it would make if you add your prefix
to a static protocol and set the `check link` there, too.

Again, it's just a wild guess...

Good luck,
Bernd

On 28.04.24 11:30 AM, chan alfie wrote:
> Hi, community
> 
> I have create a loopback interface on linux and assign 4 subnets on it.
> 
> ```
> ip link add dev lo235 type dummy
> ip link set lo235 up
> ip addr add 10.23.5.1/30 dev lo235
> ip addr add 10.23.5.5/30 dev lo235
> ip addr add 10.23.5.9/30 dev lo235
> ip addr add 10.23.5.13/30 dev lo235
> ```
> 
> stubnet <prefix> { summary;}; is used on an originator routers(r235) ospf area, and it indeed propagted the summary prefix instead of subnets, here is the config:
> 
> r235:
> ```
> area 10.23.0.0 {
>   ...
>   stubnet 10.23.5.0/28 {
>     summary;
>   }
>   ...
> }
> ```
> 
> r235:
> ```
> show ospf state
> ...
>         router 10.23.0.5
>                 distance 0
>                 ...
>                 stubnet 10.23.5.0/28 metric 10
> ...
> ```
> 
> but when I shutdown the lo235 or delete all of the subnets, the 10.23.5.0/28 is still advertised by r235.
> 
> r235
> ```
> ip link set lo235 down
> or
> ip addr del 10.23.5.1/30 dev lo235
> ip addr del 10.23.5.5/30 dev lo235
> ip addr del 10.23.5.9/30 dev lo235
> ip addr del 10.23.5.13/30 dev lo235
> ```
> 
> r235
> ```
> bird> show ospf state
>         router 10.23.0.5
>                 distance 0
>                 ...
>                 stubnet 10.23.5.0/28 metric 10
> ```
> 
> How to make ospf advertise stubnet base on the interface/subnet state, (interface up/down, subnets existed or not)?
> 
> By the way, networks{} clause works as expected. When the subnet of originator router is dismiss, the ABR's networks will take effect(disappear of appear).

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