Cisco: Md5

| Type | Algorithm | Status | |------|-----------|--------| | Type 5 | MD5 | Legacy / Insecure | | Type 8 | PBKDF2-SHA256 | (since IOS 15.3(3)M) | | Type 9 | SCRYPT | Most secure (since IOS 15.3(3)M) |

Beyond routing protocols, MD5 is used locally on Cisco devices to secure the privileged EXEC mode (enable mode). cisco md5

If you configure MD5 authentication on a link but the neighbor relationship does not form: | Type | Algorithm | Status | |------|-----------|--------|