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3160-A2-GB21-80
March 1999
IP Network Addressing Scenarios
F
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:
H 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).
H 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.
H 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.
H 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.
H 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.