Cabletron Systems CSX1000, CSX1200 manual Wan

USER’S GUIDE

ASN. 1 File

CSX1200

MIB

	128.111.1.1
	LAN A
MIB Formatter	WAN
	128.111.1.1

	Network Management
		Station
MIB			Network Management
				Station

The SNMP Agent will process all SNMP Protocol Data Units (PDUs) which are received at a LAN port or which are received at a WAN port. (A PDU contains both data and control (protocol) information that allows the two processes to coordinate their interactions. The SNMP feature has five types of PDUs: GetRequests, GetNextRequests, GetResponses, SetRequests, and Traps.) This is shown in the above illustration, which depicts a network in which the Network Management Station on LAN A or the remote NMS can manage the system.

All SNMP GetRequest, GetNextRequest, and SetRequest PDUs will be parsed and processed by the SNMP Agent, and an appropriate GetResponse PDU will be generated in response to each valid request PDU. In addition, to ensure security, each incoming PDU will be authenticated by the SNMP Agent. The authentication scheme makes use of a table of Community Name/MIB-access- level pairs, which is searched to determine if the Community Name specified in an incoming request PDU is valid. If the Community Name is valid, the corresponding MIB access level is then checked to determine if the Community Name has the access rights needed to perform the desired PDU action. If either the Community Name or the MIB access right level is invalid, the SNMP Agent will discard the request PDU.

The collection of data objects that can be managed using the GetRequest, GetNextRequest, and SetRequest PDUs is known as the Management Information Base (MIB). The MIB maintained by the SNMP Agent consists of a universal standard set of objects, known as MIB-2, as well as a set of objects that are specific to the system, known as the Enterprise MIB.

The definition for MIB-2 is given in RFC (Request For Comments) 1213: “Management Information

Base for Network Management of TCP/IP-based Internets: MIB-II.”

The SNMP Agent supports the following MIB-2 groups: the System group, the Interfaces group, the Address Translation (AT) group, the Internet Protocol (IP) group, the Internet Control Message Protocol (ICMP) group, the User Datagram Protocol (UDP) group, the Transmission Control Protocol (TCP) group, and the Simple Network Management Protocol (SNMP) group.

302 CyberSWITCH