Digital Equipment DECagent 90, User Information

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Figure 1–1 shows a typical configuration of the DECagent 90 in an Ethernet local
area network (LAN).
Figure 1–1 Sample DECagent 90 Configuration
Workstation Workstation DECserver
DECbridge 90
Work Group Bridge
Backbone Ethernet
Computer 1 Computer 2 Server
PC
LJ-01458-TI0
ThinWire Segment Work Group
DECagent 90 DECrepeater 90T DECserver 90L
Work Group
How the DECagent 90 Works
The DECagent 90 acts as a proxy agent on behalf of its client modules. This
includes the DECserver 90L and the DECbridge 90. The DECrepeater 90C and
DECrepeater 90T are managed by a DECbridge 90 in the hub. The DECagent 90
accepts SNMP messages on behalf of its client modules, sends an appropriate
command to the queried client module, and waits for a response from the client
module. When it receives a response from the client module, the DECagent 90
sends an SNMP packet to the querying Network Operations Center (NOC).
The DECagent 90 has a single IP address. It implements the protocols required
for SNMP-based proxy access. The following protocols are used:
ARP
IP
UDP
SNMP
BootP
1–2 Overview