Okay, nevermind! I discovered what was occurring. I was
misunderstanding my own configuration. On a remote router I
was redistributing IS-IS into OSPF. So, when my local
interface--running IS-IS--went down, this triggered an LSA
update remotely, which in turn caused the OSPF demand circuit
Okay, maybe it doesn't quite qualify as a mystery but it just
occurred to me that I don't know what actually triggers a
demand circuit to come up. I *thought* I did until I ran into
a new scenario tonight that confused me.
In this scenario, IS-IS and OSPF are running on a router, but
only on
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