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Implementasi WCCP September 8, 2008

Posted by ZoeL in Cisco.
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WCCP, kalau googling ada yang bilang Web Cache Coordination Protocol, ada juga yang bilang Web Cache Communication Protocol. Kalau Cisco sih bilangnya Coordination. Gw sendiri baru pertama kali ini nyobain masang WCCP. Ada BUMN yang beli cache engine dan Catalyst Layer3 sebagai media interaksi antar Cache-Engine. Setelah baca-baca, kesimpulan gw WCCP itu berfungsi sebagai media interaksi antara satu atau beberapa router dengan satu atau beberapa cache-engine. Ada banyak merek-merek Cache-Engine (Web-Cache). Cisco sendiri juga punya Cache-Engine. Tapi gw juga belom pernah liat langsung kaya gimana bentuknya.

Kebetulan dapat kesempatan mencoba teknologi WCCP dengan Cache Engine merek Ironport. Seri S650. Kalau menurut engineer-nya sih yang seri paling tinggi. Client belinya 2 Cache Engine dan 2 Catalyst 6506.

Baca-baca dikit kok kayanya gak gitu sulit di diimplementasi. Bukannya mau belagu nih. Tapi beneran deh.  Konsep dasarnya ngebelokin traffic yang diinginkan (biasanya HTTP) ke arah interface yang menuju Cache-Engine. Lalu nantinya dari cache engine diteruskan ke Internet, atau di kembalikan sebagai bentuk larangan akses (DENIED). Keuntungan lainnya, Client tidak perlu merubah seting pada Internet Browser karena Web-cache berkerja Transparent. Cara kerja web-cache ini mirip sekali dengan cara kerja transparent proxy, atau Squid.

Ada beberapa syarat penting supaya web-cache bisa berjalan.

  1. Subnet harus routable (apabila mencoba implementasi redundant/failover cache-engine via WAN). Untuk Failover, masih dalam tahap running implementasi dan masih belum sukses.
  2. Catalyst ID, Loopback dan subnet pada Catalyst dan Cache-Engine harus di daftarkan pada semua Cache-egine.

Contoh Command untuk WCCP

Router(config)# ip wccp version 2
Router(config)# ip wccp web-cache
Router(config)# interface Fa0/0
Router(config-if)# ip wccp web-cache redirect out
Router(config-if)# ^Z

Bagaimana kalau ingin memeriksa status WCCP?

Router# show ip wccp
Global WCCP information:
Router information:
Router Identifier: -not yet determined-
Protocol Version: 2.0

Service Identifier: 2
Number of Cache Engines: 0
Number of routers: 0
Total Packets Redirected: 0
Redirect access-list: -none-
Total Packets Denied Redirect: 0
Total Packets Unassigned: 0
Group access-list: -none-
Total Messages Denied to Group: 0
Total Authentication failures: 0
Router#

Begitu aja kira-kira implemen WCCP.
Senangnya bisa testing bareng Expert di kantor. Kalau gak begini, kapan lagi bisa cobain Fitur beginian di Cisco.

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