When testing the OSPF graceful shutdown feature, I've encountered an interesting OSPF feature: if you force a change in LAN DR router (other than rebooting the current DR), you'll end up with two network LSAs describing the same LAN.
This blog has been sitting in my Draft folder for years, so Cisco IOS behavior might have changed in the meantime, or it might have been a transient and/or race condition. Nonetheless, I still find it interesting.
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