Selasa, 09 September 2008

BGP Maximum-Prefix - BGP Status Idle (PfxCt)



Mungkin hanya sekedar share saja, berdasarkan pengalaman. Jika Anda memiliki koneksi BGP, kemudian BGP tersebut restart. Ketika anda lihat disatu sisi BGP statusnya active, sedangkan disisi satunya adalah idle Idle (PfxCt) :

State/PfxRcd
Idle (PfxCt)

Maka itu bisa terjadi karena adanya maximum prefix yang di setting diantara kedua koneksi BGP tersebut. Hal itu merupakan feature IOS Cisco untuk membatasi prefix yang akan di advertise. Mungkin hal tersebut dilakukan dengan pertimbangan kemampuan dari router lawan untuk menerima prefix yang besar. Bisa jadi router tersebut tidak kuat dan akhirnya hang.

Untuk memperbaiki koneksi link BGP yang memiliki status Idle (PfxCt) tersebut tinggal menjalankan perintah "clear ip bgp x.x.x.x" (x.x.x.x adalah ip neighbour BGP lawan) yang dijalankan di router yang membatasi prefix tersebut, contoh command nya :

# neighbor 10.1.1.1 maximum-prefix 3000

!--- Drops the peering to 10.1.1.1 when
!--- more than 3000 prefixes are sent.


# neighbor 10.1.1.1 maximum-prefix 3000 warning-only

!--- Logs a warning message when the peer sends
!--- more than 3000 prefixes.


# neighbor 10.1.1.1 maximum-prefix 3000 50

!--- Logs a warning message at 1500 and drops the
!--- peering when over 3000 prefixes are sent.


# neighbor 10.1.1.1 maximum-prefix 3000 50 warning-only

!--- Initially warns at 1500 and re-warns
!--- (different message) at 3000 prefixes received.
!--- However, the BGP Peer is not disconnected.

Lebih aman jika tidak menggunakan perintah "warning only" untuk menghindari router hang karena tidak kuat menerima prefix yang banyak. Biarkan hanya koneksi BGP nya saja yang down.

Setelah menjalankan clear ip bgp tersebut, maka koneksi BGP akan kembali normal.

Untuk referensi silahkan klik disini.


In English...

Maybe just share [only], base experience. If You haves connection BGP, later, BGP are referred [as] restart. When you see disatu side BGP its status active, whereas disisi the other one are idle Idle (PfxCt) :

State/PfxRcd
Idle (PfxCt)

Then it might happened caused by maximum prefix that in range from to setting both connection BGP are referred [as]. That thing is feature IOS Cisco to limit prefix that will in advertise. Maybe that conducted with ability consideration from opponent router to accept big prefix. It is possible router are referred [as] weak and finally hang.

To repair connection link BGP that have status Idle (PfxCt) referred [as] remain run command "clear ip bgp x.x.x.x" (x.x.x.x is ip neighbour BGP opponent) that run in router that limit prefix are referred [as], example command its :

# neighbor 10.1.1.1 maximum-prefixes 3000

!--- Drops the peering to 10.1.1.1 whens
!--- more than 3000 prefixes are sents.


# neighbor 10.1.1.1 maximum-prefixes 3000 warning-onlies

!--- Logs a warning message when the peer sends
!--- more than 3000 prefixeses.


# neighbor 10.1.1.1 maximum-prefixes 3000 50

!--- Logs a warning message at 1500 and drops thes
!--- peering when over 3000 prefixes are sents.


# neighbor 10.1.1.1 maximum-prefixes 3000 50 warning-onlies

!--- Initially warns at 1500 and re-warnses
!--- (different message) at 3000 prefixes receiveds.
!--- However, the BGP Peer is note disconnected.

Safer otherwise use command "warning only" to avoid router hang because weak accept prefix that many. Let only connection BGP just its that down.

After run clear ip bgp are referred [as], then connection BGP will return normal.

For reference please click here.



Dony Ramansyah
site : http://dony-ramansyah.bravehost.com
blog : dony-ramansyah.blogspot.com
email : dony.ramansyah[at]gmail.com
Registered linux user : ID 400171

Senin, 08 September 2008

Sertifikasi CCIP dari Cisco (Cisco CCIP Certification)







Sebelumnya saya mengucapkan Selamat Menunanaikan Ibadah Puasa, Semoga amal ibadah kita diterima 4JJl SWT.

Disini saya akan membahas sedikit mengenai sertifikasi CCIP dari Cisco. Berdasarkan pengalaman saya akan memberikan gambaran sedikit mengenai CCIP ini. CCIP Merupakan sertifikasi lanjutan jenjang Profesional dari Cisco setelah CCNA. Memang jenjang lanjutan setelah CCNA tidak hanya CCIP, ada juga CCNP, CCDP, CCVP, CCSP.

CCIP (Cisco Certified Internetwork Professional) sendiri merupakan jenjang sertifikasi profesional dari Cisco yang lebih mengarah kepada orang yang bergelut dengan teknology IP terutama di Service Provider (ISP). Untuk mendapatkan Sertifikasi ini harus melalui 4 modul ujian terlebih dahulu.

Modul materi ujian yang harus dikuasai adalah :
- Building Scalable Cisco Internetworks (BSCI)
- Implementing Cisco Quality of Service (QoS)
- Configuring BGP on Cisco Routers (BGP)
- Implementing Cisco MPLS (MPLS)

Untuk lebih jelasnya silahkan klik disini.

Jika tidak ada halangan saya juga akan membahas keempat modul tersebut satu persatu :)


In English...

Here I will discuss a few/little hit certification CCIP from Cisco. Base my experience will give picture [of] a few/little hits this CCIP. CCIP is certification of ladder continuation Profesional from Cisco after CCNA. Continuation ladder after CCNA not only CCIP, there is also CCNP, CCDP, CCVP, CCSP.

CCIP (Cisco Certified Internetwork Professional) by it self is ladder of professional certification from Cisco that more direction to one who struggle with teknology IP especially in Service Provider (ISP). To get this Sertifikasi must passed by 4 test modules beforehand.

Module of test matter that must controlled is :
- Building Scalable Cisco Internetworks (BSCI)
- Implementing Cisco Quality of Service (QoS)
- Configuring BGP di atas Cisco Routers (BGP)
- Implementing Cisco MPLS (MPLS)

To be more sharpness please clicks here.

Otherwise there is my barrier also will discuss fourth module is referred as one by one :)



Dony Ramansyah
site : http://dony-ramansyah.bravehost.com
blog : dony-ramansyah.blogspot.com
email : dony.ramansyah[at]gmail.com
Registered linux user : ID 400171