Distributed Name Service (DNS) Management Operations Manual

DNS Object Names
Introduction to DNS Names
31258 Tandem Computers Incorporated 2–5
Figure 2-1. An ATM Is a Composite Object
PATHWAY SNAX SNAXHLS
Components of the Composite
\B.$PM \B.ZNET \B.$HLS9
TERM-006
(Terminal)
$LINE4.#LU3
(Logical Unit)
#LINE4.LU3
(Session)
Composite Object
Composite NameATM-44
S8121-007
Domains Within a network, all or part of the DNS database can be replicated (duplicated) on
different nodes; only alias, composite, and group names can be replicated. The set of
nodes on which DNS replicates the initial definition of an alias, group, or composite
name (or an update to that definition) is called the domain. Each node listed in a
name’s domain has a copy of that name’s definition.
Figure 2-2 displays two domains: DOMAIN1 and DOMAIN2. DNS object names with
the domain of DOMAIN1 are known to all nodes in DOMAIN1. A name with the
domain of either DOMAIN1 or DOMAIN2 is known to node C since it is part of both
domains.
If you add another node to DOMAIN2, every DNS object name that specifies
DOMAIN2 as its domain will be known to the new node added to DOMAIN2. The
name exporter and name manager for the local node of DOMAIN2 (the node where
DOMAIN2 is defined) replicates the names to the new node.
Nodes are added to existing domains with the ALTER DNSDOMAIN command, as
described in Section 7. For more information about how the name manager and name
exporter replicate names, see Section 5.