Carrier Access Access Navigator - Manual (Page 665)

Access Navigator - Release 1.8 August 2003 C-7
SNMP Interface
SNMP Protocols
SNMP Protocols
The Manager and Agent are software applications. They communicate with each other through several
protocol layers that are normally transparent to the user (Figure C-3). The Access Navigator uses
Ethernet as the physical link between the Manager and Agent. Ethernet can, in turn, be transport any
TCP/IP data.
SNMP is an application-level protocol intended to work with the User Datagram Protocol (UDP) and
Internet Protocol (IP) suite, which includes BootP, Internet Control Message Protocol (ICMP), Address
Resolution Protocol (ARP), and Reverse ARP (RARP). The advantage of UDP is that each message is
independent (connectionless), so no network connections are continuously maintained between the
Manager and Agent.
Figure C-3. SNMP Protocol Hierarchy Used in the Access Navigator
Telnet
IP
SNMP
TCP UDP
Ethernet
ICMP BootP ARP RARP
Manager Agent (many paths are possible)