Simple Network Management Protocol

SNMP Version1

SNMP
menejeri

• 1988 yilda IETF tomonidan taqdim etilgan.
• SNMP protokoli boshqariladigan qurilma va o’rtasidagi aloqani osonlashtiradi.

• SNMP v1 ga 5 ta xabar kiritildi.
• GetRequest

• SetRequest
• GetNextRequest

• Trap
• Response

Manager dan Agent ga
Agent dan Manager ga

SNMP xabarlari

• Get-Request
• Menejer tomonidan aniq ma’lumotni olish uchun Agentga yuboriladigan so’rov
• Get-Next-Request
• Menejer tomonidan keyingi boshqaruvchi obyekt haqidagi ma’lumotlarni so’rash uchun yuboriladigan so’rov.
• Set-Request
• Tarmoq elementining qiymatini o’zgartiradi.
• Get-Response
• Agent menejerdan olingan qabul qilish va o’rnatish ma’lumotlariga javob beradi.
• Trap
• Agent tomonidan yaratilgan signal (qandaydir hodisa sodir bo’lsa menejerga xabar jo’natadi).

SNMP v1

• Aloqa SNMP protokoli yordamida (PDU - Protocol Data Units ) amalga oshiriladi, ular odatda UDP paketlariga kiritiladi.
• UDP portlari: 161 va 162, SNMP uchun zaxiralangan standart portlardir.
• Agent 161-portdan so’rov va javoblarni eshitadi.
• …har xil portlarni ishlatish ko’rsatilmasa, 162-portdagi asinxron trap larni bildiradi.

SNMP Protocol Data Unit (PDU)

Request ID
Error Status
Error Index
Object 1
Value 1
PDU TYPE
PDU TYPE
Enterprise
Agent Addr
Gen Trap
Spec Trap
Time Stamp
Object 1
Value 1
Object 2
Value 2
Javob uchun SNMP so’rovi uyushmasi

• Bir qator xato va xato turlarini ko’rsatadi.
• Response’ operatsiyasidan foydalanib o’rnatiladi.
• Boshqalar uni ‘0’ bilan o’rnatadi

General PDU Structure

4: Trap
under whose registration authority trap was defined.
Management Enterprise
Agent’s IP Address
(for further
identification) Trap PDU Structure
Generic Trap Type: 7 values are defined: coldStart(0) warmStart(1) linkDown(2) linkUp(3)
authenticationFailure(4) egpNeighborLoss(5) enterpriseSpecific(6)
Specific Trap Type: Identifies non-generic trap when Generic Trap Type set to ‘enterpriseSpecific(6)’

Time elapsed between
last network reinitialization and trap generation
0: GetRequest
1: GetNextRequest
2: SetRequest
3: GetResponse

• Associates error with object instance.
• Set by ‘Response’ operation.
• Others set it to ‘0’

value