Are those routed links, or bridged links?
Is this all one big area?
If they're routed links and it is one area my suggestion would be the below.
- Red dots are routers in the backbone area (0.0.0.0)
- Yellow dots are routers in a not so stubby area (0.0.0.1) advertising a default route on the ASBR.
- Green dots are routers in a stubby area (0.0.0.2)
- Orange dots are routers in a stubby area (0.0.0.3)
- Cyan dots are routers in a stubby area (0.0.0.4)
Try to summarize at the area borders via area ranges as much as you can to hide any thrashing within the area from other areas. Hopefully this won't require too much re-addressing of links/connected routes. That's going to be the major benefit: summarizing at area borders allows to you to completely hide that links within an area are having events because the summary inter-area route advertised to other areas stays completely stable.
That should minimize convergence time.
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Specific answers require specific questions. When in doubt, post the output of "/ip address print detail", "/ip route print detail", "/interface print detail", "/ip firewall export", and an accurate network diagram.