Carrier Access SNMP manual Protocols, Protocol Hierarchy Used In Access Bank II Snmp

SNMP Management

objects with predefined MIB data structures. The Access Bank II/SNMP uses the Bellcore® standard MIB for T1 interfaces.

Manager operations include simple “get” and “set” commands to retrieve and update MIB data in the Agent. Normally, the Manager polls the Agent periodically to check traffic statistics. However, the Manager can also set thresholds for traps. Traps specify network events and conditions for which the Agent automatically sends a Telnet alarm message with trap data back to the Manager.

The Access Bank II SNMP Agent’s principle benefits are the proactive management of V.35 and DSX-1 alarms, performance statistics, and line tests.

14.3.3 Protocols

The Manager and Agent are software applications. They communicate with each other through sev- eral protocol layers (Figure 14-2) that are normally transparent to the user. The Access Bank II/ SNMP uses Ethernet as the physical link between the Manager and Agent. The Ethernet data can, in turn, be carried over either of the T1 lines within a V.35 user data segment.

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; no network connections are maintained between the Manager and Agent.

Manager (many paths are possible)				Agent
	Telnet		SNMP
	TCP		UDP
ICMP	BootP	IP	ARP	RARP
		Ethernet

Figure 14-2: Protocol Hierarchy Used In Access Bank II SNMP

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