How to Configure a Cache Engine for Reverse-Proxy Caching Using WCCP

Document ID: 28832

Network Diagram
Configurations

debug and show Commands
Verification
Command Summary
Related Information

Introduction

This document describes how to configure the Cisco Cache Engine for reverse-proxy caching by using the Web Cache Coordination Protocol (WCCP).

Hardware and Software Version

This configuration was developed and tested using the software and hardware versions below.

Cisco Cache Engine 560 running Cisco Cache Software Release 2.3 and ACNS version 4.0 and ACNS 5.0 in a lab environment with cleared configurations.
Cisco 2600 Router running Cisco IOS® Software Release 12.1(2).

The information presented in this document was created using equipment in a lab environment. The devices started with a cleared (default) configuration. If you are working in a live network, make sure that you understand the potential impact of a command before using it.

Network Diagram

Configurations

Cache Engine 560 (Cache Software Release 2.3 or ACNS Software Release 4.0 or 5.0)

Current configuration:
!
!
user add admin uid 0 
password 1 "eeSdy9dcy" 
capability admin-access
!
!
!
hostname ce
!
interface ethernet 0
 ip address 10.0.0.2 255.255.255.0
!--- Important: If you configure the Cache Engine
!--- with a private address, it must get translated
!--- to a public address.
 ip broadcast-address 10.0.0.255
exit
!
interface ethernet 1
exit
!
ip default-gateway 10.0.0.1
ip name-server 171.70.168.183
ip domain-name cisco.com
ip route 0.0.0.0 0.0.0.0 10.0.0.1
cron file /local/etc/crontab
!
wccp router-list 1 10.0.0.1
wccp reverse-proxy router-list-num 1
wccp version 2
!
authentication login local enable
authentication configuration local enable
rule no-cache url-regex .*cgi-bin.*
rule no-cache url-regex .*aw-cgi.*
!
!

Cisco 2600 Router (Cisco IOS Software Release 12.1[2])

Building configuration...

Current configuration:
!
version 12.1
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
!
hostname 2611-5
!
enable secret 5 $1$9VQ.$BTPbq8xlE2dsKwKPDDmpL/
!
!
ip subnet-zero
ip wccp 99
!
!
interface Ethernet0/0
 description Interface to the Internet 
 ip address 172.17.63.194 255.255.255.192
 no ip redirects
!
interface Serial0/0
 no ip address
 no ip mroute-cache
 shutdown
!
interface Ethernet0/1
 ip address 10.0.0.1 255.255.255.0
!
interface Ethernet1/0
 ip address 10.1.0.1 255.255.255.0
 ip wccp 99 redirect out
!
interface Ethernet1/1
 no ip address
 shutdown
 full-duplex
!
interface Ethernet1/2
 no ip address
 shutdown
!
interface Ethernet1/3
 no ip address
 shutdown
!
ip classless
ip route 0.0.0.0 0.0.0.0 172.17.63.193
!
!
line con 0
 transport input none
line aux 0
line vty 0 4
 login
!
end

`debug` and `show` Commands

Before issuing debug commands, please see Important Information on Debug Commands.

Cache Engine debug and show commands:

show wccp cache - Show WCCP CE information
show wccp flows - Show WCCP packet flows
show wccp routers - Show WCCP router list
show wccp services - Show WCCP services configured
show wccp slowstart - Show WCCP Slow Start
show wccp status - Show WCCP running status
show statistics http savings - Displays HTTP savings statistics
debug wccp all - WCCP Turn on all debugging
debug wccp events - WCCP events
debug wccp packets - WCCP packet-related information

Router debug and show commands:

show ip wccp 99 detail - This command displays Cache Engine and WCCP router statistics for a service group.
show ip wccp 99 view - Service group view information
debug ip wccp events - WCCP events
debug ip wccp packets - WCCP packet-related information

Verification

Verify that reverse proxy caching is working with these commands.

Issue this command to check WCCP Cache/Content Engine status:

router#sh ip wccp 99 detail 
WCCP Cache-Engine information: 
       IP Address:            10.0.0.2 
       Protocol Version:      2.0 
       State:                 Usable                              
	   !--- This cache is active.
       Initial Hash Info:     00000000000000000000000000000000 
                              00000000000000000000000000000000 
       Assigned Hash Info:    FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF 
                              FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF 
       Hash Allotment:        256 (100.00%) 
       Packets Redirected:    93 
       Connect Time:          00:15:27

Issue this command to check WCCP transparent reverse redirection on the router:

router#sh ip wccp 99 
Global WCCP information: 
    Router information: 
        Router Identifier:                   172.17.63.194 
        Protocol Version:                    2.0 
    Service Identifier: 99 
        Number of Cache Engines:             1 
        Number of routers:                   1 
        Total Packets Redirected:            93                   
		!--- The router is redirecting.
        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

Issue this command to cache#sh statistic http request Total Received Requests: Forced Reloads: Client Errors: Server Errors: URL Blocked (Reset): URL Blocked: Sent to Outgoing Proxy: Failures from Outgoing Proxy: Excluded from Outgoing Proxy: ICP Client Hits: ICP Server Hits: If-Range Hits: HTTP 0.9 Requests: HTTP 1.0 Requests: HTTP 1.1 Requests: HTTP Unknown Requests: Non HTTP Requests: Non HTTP Responses: Chunked HTTP Responses: Http Miss Due To DNS: Http Deletes Due To DNS: Objects cached for min ttl: check HTTP statistics on the Cache/Content Engine:

Statistics - Requests Total % of Requests --------------------------------------------------- 23 - 2 8.7 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 23 100.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 4 17.4

Issue this command to verify the caching of requests:

cache#sh stat http sav 
                         Statistics - Savings 
                        Requests                          Bytes 
         ----------------------------------------------------------- 
  Total:                      23                          16481 
   Hits:                       6                           2205 
   Miss:                      17                          14276 
Savings:                    25.0 %                         13.4 %

Command Summary

These Cache Engine commands were used in this configuration.

wccp version {1 | 2}
wccp router-list number ip-address
wccp router-list-num number

These router commands were used in this configuration.

ip wccp {web-cache | service-number}
ip wccp {web-cache | service-number} redirect out
ip wccp version 2

Related Information

Updated: Jan 31, 2006

Document ID: 28832

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