Symptom
When the "radius-server attribute 31 mac format ietf" command is configured without any further argument CLI parser will generate it with extra trailing space at the end of this line
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radius-server attribute 6 on-for-login-auth<== no trailing space
radius-server attribute 6 support-multiple<== no trailing space
radius-server attribute 8 include-in-access-req<== no trailing space
radius-server attribute 25 access-request include<== no trailing space
radius-server attribute 31 mac format ietf <====================== trailing space
radius-server attribute 31 send nas-port-detail<== no trailing space
radius-server dead-criteria time 30 tries 3<== no trailing space
!
Conditions
Following command configured:
radius-server attribute 31 mac format ietf
WITHOUT the trailing lower-case or upper-case
Workaround
Configure radius-server attribute 31 mac format ietf upper-case
Further Problem Description
It was initially suspected that this was interfering with the ability of Cisco DNA to manage the device.
That has proven not to be the case.
There is another bug, CSCvu98900, to address the Cisco DNA issue when "radius-server attribute 31 mac format ietf" is configured.