Connectivity; Runtime Ip Address Discovery - Cabletron Systems 2208 User Manual

Chapter 1: Introduction
1.3.2

Connectivity

The 2H22-08R connects to Ethernet networks or workstations through six
RJ45 ports on the front panel. These ports support Category 5 unshielded
and shielded twisted pair cables of lengths up to 100 meters. These ports
are IEEE 802.3u 100BASE-TX compliant.
The 2H22-08R has two front panel slots (ports 7 and 8) for optional Fast
Ethernet Interface Modules (FE-100TX, FE-100FX, and FE-100F3) to
support an uplink to 100 Mbps Fast Ethernet backbones or a high speed
connection to a local server using twisted pair, multimode or single mode
fiber optic cabling.
1.3.3

Runtime IP Address Discovery

This feature enables the 2H22-08R to automatically accept an IP address
from a Boot Strap Protocol (BootP) server on the network into NVRAM
without requiring a user to enter an IP address through Local
Management.
When the 2H22-08R is connected to the network and powered up,
Runtime IP Address Discovery (RAD) checks the 2H22-08R for an IP
address. If one has not yet been assigned (2H22-08R IP address set to
0.0.0.0), RAD checks to see if any of the 2H22-08R interfaces have a link.
If so, RAD sends out Reverse Address Resolution Protocol (RARP) and
BootP requests to obtain an IP address from a BootP server on the
network.
The RAD requests start out at an interval of 1 second. The interval then
doubles after every transmission until an interval of 300 seconds is
reached. At this point, the interval remains at 300 seconds. The RAD
requests continue until an IP address is received from a BootP server, or
an IP address is entered using Local Management.
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