Transport output ssh must be set to the console 0.

https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/snmp/configuration/15-e/snmp-15-e-book.pdf There are three SNMP security levels (for SNMPv1, SNMPv2c, and SNMPv3):
+ noAuthNoPriv: Security level that does not provide authentication or encryption. + authNoPriv: Security level that provides authentication but does not provide encryption. + authPriv: Security level that provides both authentication and encryption.
For SNMPv3, "noAuthNoPriv" level uses a username match for authentication.

MPLS uses a 32-bit label field that contains the information that follows:
+ 20-bit label (a number)
+ 3-bit class of service (or experimental field, typically used to carry IP precedence value)
+ 1-bit bottom-of-stack indicator (indicates whether this is the last label before the IP header)
+ 8-bit TTL (equal to the TTL in the IP header)