Les,

> I did (an admittedly casual) review of such fields in all TLVs defined during 
> the existence of the IS-IS/LSR WGs - which covers over 20 years. I did not 
> find a single occurrence where the flags field ever got extended.


draft-ietf-isis-te-app defines the Application Specific Link Attributes TLV.  
That includes the Standard Application Identifier Bit Mask and defines three 
bits.

draft-ietf-lsr-flex-algo extends this with one bit for FlexAlgo.

So there is one example.

Tony

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