This section deals with the internetwork as a whole. The internetwork
worksheets consist of an internetwork map, which shows an overview of your
internetwork, and an internetwork table. You will take the following
steps when filling out the internetwork worksheets:
Draw sketches of each network in the internetwork.
Write network names, IP network addresses, and network types.
Draw gateway nodes.
Indicate network boundaries.
An internetwork map provides information about the whole internetwork.
Figure 3-1 "Internetwork Map" is an example
of an internetwork map. This sample internetwork will be used throughout the
instructions in this chapter to help explain the other drawings and tables that
make up the configuration worksheets.
Before you can draw your internetwork map, you must know how many networks your
internetwork will contain, and you must know each network type (ThinLAN, Token
Ring, FDDI, 100VG-AnyLAN, 100Base-T, NS Point-to-Point, or X.25). The
internetwork in the example (Figure 3-1
"Internetwork Map") contains six networks. NET1 and NET5 are LANs, NET1 is
100Base-T LAN and NET5 is a ThinLAN, NET2 is a Point-to-Point network, NET3 is
an X.25 network, NET4 is a Token Ring network, and NET6 is an FDDI network.
NOTE: If you have an X.25 network, you should indicate the presence of
each Datacomm and Terminal Controller (DTC) in your internetwork map, as shown
in this example (Figure 3-1 "Internetwork
Map"). Both the NS 3000/iX node and the DTC must be specially configured
for X.25 links.
Figure 3-1 Internetwork Map
Communication Between Networks
Since the main purpose of the internetwork map is to show how networks are
connected, gateway nodes are the only nodes you should label on the
internetwork map. All other nodes and their networks can be represented by
drawing sketches of the networks, as shown in
Figure 3-1 "Internetwork Map". In the
example, node B is a full gateway that belongs to NET1 and NET2, node A is a
full gateway that belongs to NET1 and NET4, and node C is a full gateway that
belongs to NET1 and NET6. Nodes G and H are gateway halves that belong to NET2
and NET5, respectively.
NOTE: Single letters are used to represent node names in this example.
Actual node names must be in an accepted format. They may be either in the form
nodename.domain.organization or they may be in a valid domain name
format.
Network Boundaries
Once you have drawn your gateway nodes and routers, you have established
network boundaries. Consider the example and look at
Figure 3-1 "Internetwork Map". Since node B
in the example is a full gateway and belongs to both NET1 and NET2, the
boundary between these two networks is at node B itself. The boundary between
NET2 and NET5 is along the gateway-half link that connects gateway nodes G and
H.
IP Network Addresses
Each network in your internetwork must have a unique IP network address. Add
these IP addresses to your internetwork map.
In the example, assume that the Class C IP network addresses are those shown in
Figure 3-1 "Internetwork Map". The specific
IP node addresses do not need to be shown until completion of specific parts of
the network worksheets, so node portions of IP addresses will be represented
with XXX in some maps and tables.