Symptom
On "show snmp mib ifmib ifindex detail [InterfaceName]" output, the "Description" field will be truncated for Interfaces with more than 32 characters.
Conditions
Any type of interface with a name with more than 32 characters will have this problem.
Interface must be on mib
SNMP agent must be running
Further Problem Description
This issue was discovered on 16.8.1 but was seen on 17.6.2 too.