This is my second YANG doctors review of draft-ietf-rift-yang. As mentioned in my previous review, the short descriptions and often missing references make the module difficult to understand and should be added.

typedef 'level':
- Generic name, short description, and no reference makes this a vague typedef, ideally all 3 should be improved/added.

grouping 'security', leaf 'security-type':
- Descriptions of enum values reference the RFC text, which is not suitable. When the YANG module is used on its own, the value need to be explained in the YANG module. Ideally a reference added as well.

grouping 'security', case 'auth-key-explicit':
- The leaf 'key-id' seems completely redundant, its purpose is unclear.
- The leaves 'key' and 'crypto-algorithm' seem like an oversimplified way of storing keys but I see that it was inspired by how ietf-key-chain stores them so please add a reference to that RFC.

grouping 'neighbor-node':
- Description mentions bits, which can be specified as units directly.

grouping 'neighbor':
- Leaf 'removal-reason' seems tied to 'removed-from-consideration' but this is not expressed in YANG. A must condition or when condition with mandatory flag can be used.
- Leaf 'bfd-up' should probably have a default value. Also, may be better to rename it to 'bfd' and use an enumeration with enums 'up' and 'down'.

grouping 'tie-header':
- Leaf 'origination-lifetime' and 'remaining-lifetime' should have units specified.

augment "/rt:routing/rt:control-plane-protocols/rt:control-plane-protocol":
- Leaf 'configured-level' has a complex description that should be expressed in YANG instead.
- Leaf 'state' enum values are using a different naming scheme.