[OPSAWG] re opsawg-tacacs-yang & ietf-system user-authen-order

[john heasley <[e-mail]>]

Regarding the question, on the second to last page of the opsawg-tacacs-yang
presentation slides, about the must in model ietf-system, which I believe was
whether to add a must for tacacs, remove the must for radius, or do nothing;
that must seems wrong to me.

I would expect the system to react no differently to missing sever
configuration than to a list of servers that all fail to respond.  Some
vendors have done this historically in cli.

Whether ietf-system should be changed, I do not know it is worth the effort.
If the WG agrees that its existence is wrong, that might be another question
for yang doctors.