Cabletron Systems 1800 Chapter 14 Configuring IP Routing

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.
Routin g can b e dynam ic (RI P versi ons 1 and 2 ar e supp orted), and sta tic ro utes can be
configured.
A SmartSwitch 1800 ca n also be co nfigur ed to act as a g ateway, fo rwarding IP p acke ts
it receives.
IP functionality also allows support of an SNMP agent in a SmartSwitch 1800.
(SNMP c on fi g uration i s des cr ibed 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 dec imal notati on, wh ich mean s 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