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Cara Monitor Secara Real-time Bandwidth Usage di Router Cisco dengan menggunakan SNMP Tool – STG

17 Jul

STG adalah singkatan dari SNMP Traffic Grapher. Software SNMP gratis buatan Leonid Mikhailov ini sangat terkenal untuk memantau secara real-time pemakaian bandwidth.Walaupun sudah lama tetapi software ini masih cukup ampuh untuk digunakan. Jika anda merasakan bahwa koneksi Internet/VPN labang lambat maka anda mungkin ingin mengecek bandwidth WAN anda secara real-time. Kebanyakan router menyediakan minimum 30 detik waktu interval dimana hal ini tidak memberikan gambaran detail pola traffic yang dapat terjadi dalam waktu 5-6 detik. Untuk mengecek secara mudah pemakaian bandwidth secara real-time maka ini adalah salah satu caranya.

Pertama-tama download filenya dari http://cisconet.com/downloads/stg.zip

Download filenya dan extract kemudian buka file “stg.exe”.
Maka anda dapat melihat gambar berikut:

Untuk mengubah setting maka pilih menu View –  Settings (F9)

Kemudian akan muncul gambar berikut, lihat bagian-bagian yang telah ditandai:

Parameter

1. Target Address

– Masukkan IP address dari Router Cisco, dapat berupa WAN(Serial)  atau LAN(Ethernet) interface.
Pada contoh ini, saya menggunakan IP address WAN(interface Serial).

2. Community

– Masukkan nama Community sebagai berikut “CiscoNet”. Anda dapat memasukkan nama apa saja, tetapi nama SNMP umum “public” tidaklah dianjurkan untuk alasan keamanan.

CiscoNet_Router#conf t
CiscoNet_Router(conf)#snmp-server community CiscoNET ro

** Beberapa perintah Cisco SNMP dapat digunakan pada berbagai platform seperti Nortel, Tasman and Adtran

3 dan 4. OID Hijau & OID Biru
– Ini adalah Object Identification untuk nilai MIB. Adalah baik untuk mengetahui detail SNMP dan MIB OID, tetapi hal ini membutuhkan banyak membaca dan pemahaman. Pada kasus ini, saya  akan memberikan anda cara yang mudah dan tips untuk mengerjakannya sesegera mungkin.
Lihat setting awal sebagai berikut:
1.3.6.1.2.1.2.2.1.10.1 – OID Hijau (inbound)
1.3.6.1.2.1.2.2.1.16.1 – OID Biru (outbound)
Penamaan Hijau & Biru hanyalah untuk membedakan traffic inbound dan outbound pada grafik
Saya tidak akan menjelaskan 1.3.6~~~ bla~ bla~. karena hal ini akan banyak sekali.
OK, cukup hal ini yang anda tahu.
10 = inbound traffic (MIB OID = ifInOctets)
16 = outbound traffic (MIB OID = ifOutOctets

Untuk memudahkan pencarian interface yang kita inginkan maka gunakan cara berikut:
1. Download Paessler “SNMPtester” and unzip it. http://www.paessler.com/download/snmptester
2. Dobel Klik snmptest.exe
3. Masukkan nilai-nilai berikut

(1) Set SNMP Settings
Local IP : Any
Device IP: x.x.x.x (Masukkan IP Address Router)
Port : 161 (Port SNMP)
SNMP version : v1 (versi snmp yang diset di router anda)
Community : CiscoNet (nama snmp-server community anda)

(2) Select Request Type

beri centang ” Scan Available Standard Interfaces”

(3) Run Test

(4) Sekarang anda dapat melihat daftar port yang sudah discan dan OID # pada sisi kanan jendela.
:
:
Found standard interfaces:
1: (001) Serial3/0,Connected,44 MBit/s,PropPointToPointSerial,
2: (002) Serial3/1,Connected,44 MBit/s,PropPointToPointSerial,
3: (003) FastEthernet1/0,Connected,100 MBit/s,Ethernet,
:
:

Testing standard interfaces…
Test 1 (1.3.6.1.2.1.2.2.1.10.1,1.3.6.1.2.1.2.2.1.16.1): in=3255521691 out=895468151
Test 2 (1.3.6.1.2.1.2.2.1.10.2,1.3.6.1.2.1.2.2.1.16.2): in=1699623616 out=901412374
Test 3 (1.3.6.1.2.1.2.2.1.10.3,1.3.6.1.2.1.2.2.1.16.3): in=1617415046 out=1038773682
:
:
Seperti yang saya telah sebutkan sebelumnya bahwa:
1.3.6.1.2.1.2.2.1.10.1 – menandakan OID Hijau (inbound traffic)
1.3.6.1.2.1.2.2.1.16.1 – menandakan OID Biru (outbound traffic)
* Pilih angka 1 (interface Serial3/0) atau 2 (interface Serial3/1)

5. Update Period (Masukkan nilai 1000 ms untuk refresh data setiap 1 detik)

Sekarang anda dapat melihat grafik MRTG seperti berikut:

6. Show traffic in

– Dalam hal ini kita sebaiknya menggunakan ukuran bits.

Sumber:

  • http://www.ipbalance.com/traffic-analysis/traffic-monitoring/247-quick-realtime-bandwidth-monitoring-by-snmp-tool-stg.html
  • http://indrapd.blogspot.com/2010/10/cara-monitor-secara-real-time-bandwidth.html
 
23 Comments

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  1. Reza

    September 7, 2012 at 4:54 am

    Salam..
    mas Slamet, kenalkan, nama saya reza..

    Mas, saya mau tanya lebih lanjut tentang SNMP,
    misal kan saya telah menjalankan SNMP, dan kita ingin mengambil nilai yang ada di OID pada MIB itu bagaimana caranya..?
    apakah nilai tersebut dapat diambil untuk diolah lebih lanjut?

    trima kasih mas..
    mohon bantuannya..

     
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