Draft: OSPF stub plugin

[jbemmel]

For discussion - needs more documentation and validation tests, but I'd first like to agree on the general approach before putting more effort

[ssasso]

Suggest to add also the param range as an array of subnets for area range config - to be applied only on ABR

[ipspace]

Yeah, I had that on the backburner for ages (https://github.com/ipspace/netlab/tree/ospf.areas), maybe it's time to finally get it done (after pushing out 25.06). However, it needs to address all types of OSPF areas, not just the stub areas. So we need:

• kind - stub/nssa (or regular if kind is missing)
• summary: False (default: true)
• default: False (default: true) -- for stub/nssa areas
• range: list of summarization ranges
• filter: suppressed prefixes

I had the data model (almost) worked out in 711f49e, the real show-stopper (why this isn't already out) was the dictionary. I wanted to use both area numbers as well as area addresses ("0.0.0.0") as the dictionary entries, but of course "0.0.0.0" gets exploded by Box and needs to be recreated.

Looks like the only way to get that solved would be to have a list of areas, with every element having area key, and the plugin reverse-engineering the list from the dict if needed.

Give me a few days ;)

[jbemmel]

Give me a few days ;)

I ran into the ipv4 thing as well, perhaps cdgriffith/Box#297 could help (if accepted)

[jbemmel]

Replaced by #2363