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

    Verifier to be checked from this neighbor.  You may change this
    characteristic at any time; however, the change will not take
    effect until the circuit is next initialized.  You cannot
    display this characteristic.

    If the verifier is not set, then a connection to the neighboring
    node whose ID matches the ID in this entry is allowed.  If the
    verifier is set, the connection is allowed only if the verifier
    sent by the remote node matches the one in this entry.

    Examples:

    create routing permitted neighbor nashua_decnet-osi -
           id 08-00-2b-12-34-56
    set routing permitted neighbor nashua_decnet-osi -
           verifier %x1234

    create routing permitted neighbor nashua_phase_iv -
           id aa-00-04-00-12-34
    set routing permitted neighbor nashua_phase_iv -
           verifier %x1234