Auto-Learning Directory Server; The Data Network Address (Dna); The Network Address Server (Nas); The Network Address Client (Nac) - Nortel Passport 4400 Series Introduction Manual

Passport 4400 Introduction and Road Map

Auto-learning Directory Server

The Data Network Address (DNA)

Individual Passport 4400 units are identified by their Data Network Address
(DNA). The DNA is assigned to each passport 4400 as a unique number, from
one to 15 digits in length. The DNA is then used to map services from one
Passport 4400 to another.
When networking between a Passport 4400 and a Passport 6400 switch, the
DNAs used for the Passport 4400s can be matched to the numbering currently
being used by the Passport 6400 network, following either standard x121 or
e164 formats.

The Network Address Server (NAS)

The passport 4400 Network Address Server (NAS) is a UDP/IP-based server
used to resolve the telephone number (DN) to Passport 4400 address (DNA)
mapping in the Passport 4400 network. Its database contains all of the DNs in
the network. Multiple NASs may exist in a network, for the purpose of reliability,
scalability, and redundancy.
The voice call is via an SVC directly between the originating Passport 4400 and
the destination Passport 4400. Once the destination address has been resolved,
the NAS and NAC no longer participate in the call.
The NAS
• Resolves DN-DNA mappings using UDP/IP based protocol
• Dynamically populates the database with telephone numbers (DNs) as
• Dynamically removes "old" entries in the database
• Has a keep-alive protocol between the client and server
• Uses standard transport and network level protocols (TCP, UDP/IP)
• Is SNMP-managed

The Network Address Client (NAC)

The Network Address Client (NAC) is resident on each Passport 4400 to resolve
DN-DNA requests. The NAC acts as a UDP/IP-based client with the ability to
locally cache the DN-DNA address mapping.
The NAC
• Receives egress table information from the voice application, and
1-10
they are added, deleted, or changed. This happens at the time a new
Passport 4400 is brought into the network and periodically once the
Passport 4400 is operational in the network.
registers the local DNs to known NASs in the network.
Concepts and Applications