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Chapter 14
Configuring IP Routing
Introduction
The IP functions in the SmartSwitch 1800 support routing of IP (internet protocol)
traffic among IP devices on LANs and routed subnetworks, via frame relay or X.25.
Routing can be dynamic (RIP versions 1 and 2 are supported), and static routes can be
configured.
A SmartSwitch 1800 can also be configured to act as a gateway, forwarding IP packets
it receives.
IP functionality also allows support of an SNMP agent in a SmartSwitch 1800.
(SNMP configuration is described in Chapter 17.)
IP Addressing
IP devices are identified by IP addresses. An IP address is 32 bits, divided into a
network identifier followed by a node (host) identifier. This allows the Internet Pro-
tocol to identify each physical network and each node on each physical network. IP
addresses are generally shown in dotted decimal notation, which means that each octet
is represented by a decimal number, and octets are separated by dots, as
in:
130.6.52.245
.
IP networks are divided into classes, with this addressing scheme:
●
Class A allows up to 127 network numbers and several million node numbers:
Bit 0 is
0
, bits 1–7 are the network identifier, and bits 8–31 are the node iden-
tifier. In dotted decimal notation, the range of Class A addresses is
1.0.0.0–
127.255.255.255
.
The valid range in SmartSwitch 1800 configuration is
1.0.0.0–
126.255.255.255
.
●
Class B allows up to approximately 16,000 network numbers, and approxi-
mately 65,025 node numbers: Bits 0–1 are
10
, bits 2–15 are the network iden-
tifier, and bits 16–31 are the node identifier. In dotted decimal notation, the
range of Class B addresses is
128.0.0.0–191.255.255.255
.
Network
Node