Cabletron Systems ELS10-26 manual Snmp Primitives

Introduction

1.4 SNMP PRIMITIVES

The major software interface between the NMS and ELS10-26 consists of one simple mechanism – the exchange of SNMP (Simple Network Management Protocol, RFC 1157) datagrams over any available physical media. The following restrictions apply:

•All datagrams must obey SNMP format.

•All datagrams must be sent via UDP and IP. Thus, all datagrams will have UDP and IP headers.

•Datagrams may be sent over any of the following physical media:

-Ethernet/802.3 LAN - the datagram must have an Ethernet MAC header, with an Ethernet frame type of IP; or, the datagram must be in 802.3 format with IP-encapsulation as defined by RFC 1042.

-UART (out-of-band management port) - the datagram must have a PPP header, which indicates that the datagram contains an IP packet. (The ELS10-26 automatically detects the presence of a PPP connection versus being connected to a non-intelligent terminal.)

The NMS must rely on IP, rather than MAC addressing for all datagrams sent to an ELS10-26. Therefore:

•All datagrams from the ELS10-26 are addressed to either an NMS or the broadcast IP address.

•Within the context of this document, the terms “datagram,” “packet,” and “PDU” are synonymous.

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