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SNMP Version 1 (SNMPv1) Message Format (Page 2 of 3) SNMPv1 PDU Formats All of the PDUs in SNMPv1 have the same format, with one exception: Trap-PDU. The exact semantics of each field in the PDU depends on the particular message. For example, the ErrorStatus field only has meaning in a reply and not a request, and object values are used differently in requests and replies as well. Table 213 and Figure 278 show the common format for most of the SNMPv1 PDUs: GetRequest-PDU, GetNextRequest-PDU, SetRequest-PDU and GetResponse-PDU:
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