Support: All
    Default: No verifier   Value: Hex string, length 0-38

    Value against which a neighbor node's received verifier is
    to be checked. If no verifier is specified, no verification
    is performed. This attribute is supported only if the
    characteristic type is either ddcmp, hdlc, x25 static incoming,
    x25 static outgoing, or x25 permanent. You cannot display this
    characteristic.