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F-13160-A2-GB21-50 January 1997
IP Network Addressing Scenarios
Overview F-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Scenario 1 F-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Scenario 2 F-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Scenario 3 F-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Scenario 4 F-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Scenario 5 F-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Overview
This appendix describes a means of configuring 31xx
Series devices in an Internet Protocol (IP) network to
provide SNMP or Telnet connectivity. Since there are
many possible network addressing schemes, this appendix
describes an addressing scheme for typical customer
network management system (NMS) scenarios. This
appendix is not intended to be an IP addressing or routing
tutorial, and a basic understanding of IP and 31xx Series
devices is assumed.
The following notes apply to these scenarios:
• Connections to remote devices may be via EDL
(for 2-port and 4-port DSU/CSUs) or FDL;
however, the FDL is only available on full T1 links
(not fractional T1s). Check with the service
provider to be sure that the FDL is end-to-end (i.e.,
not terminated at an intermediate point within the
network).
• Interconnected 31xx Series devices automatically
pass routing information between them; however, a
static route to the subnet(s) must be set in the
routing table of the NMS host. This route uses the
31xx Series device connected to the LAN (via the
LAN Adapter), or the NMS (via a direct PPP or
SLIP connection) as a gateway to the subnet(s). In
all instances, the addressing scheme presented
works for both the LAN and the direct connections.
• Although routing table entries are maintained
automatically by 31xx Series devices, without the
need for user configuration, only a maximum of
100 routes is supported for a given device.
• The choice of a host address within a given subnet
is completely arbitrary. Choose any legal host
address for a given subnet, without regard to the
local or remote devices.
• Although the default route (to the NMS) is
configurable for all devices, only devices that have
a direct external connection to an NMS (via the
COM or AUX ports) need a default route set. In the
following examples, the default port (COM or
AUX) is set in the device connected to the LAN
Adapter.
F