> Given that all links between routers are p2p these days, I would vote 
> for simplicity and make the LAN always part of the FT.

Even all links between routers are P2P these days, the network management LAN 
if available could be leveraged to realize an efficient link-state 
synchronization among  these routers. In other words, the management LAN itself 
is now the FT (see 
https://tools.ietf.org/html/draft-xu-lsr-isis-flooding-reduction-in-msdc-01).

Best regards,
Xiaohu

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