H3C Technologies H3C S3600 Series Switches - Manual (Page 771)

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VLAN-interface 10; the gateway address of PC 2 is set to the IP address of VLAN-interface 20. Web
Cache Server is used to store the information from the Internet that is frequently accessed by the users
in the LAN. It belongs to VLAN 30. The switch connects to the router through VLAN 40. Normally, HTTP
traffic of PC 1 and PC 2 are forwarded through VLAN 40 to the router, which then sends the traffic to the
Internet. By enabling Web cache redirection function on the switch, HTTP traffic of PC 1 and PC 2 is
redirected to Web Cache Server through VLAN 30.
When a user in the LAN accesses the Internet,
z If the information requested is already stored in Web Cache Server, the Web Cache Server sends
the information to the user directly, thus eliminating the access to the Internet.
z If Web Cache Server does not contain the information requested, it retrieves the information from
the Internet and then forwards the information to the user.
If both the Web cache redirection function and the STP function are configured on the switch, to avoid
Web cache redirection failure, you are recommended to configure the port connecting with the Web
Cache Server as a Trunk or Hybrid port that permits the packets of the VLAN used for HTTP traffic
transmission, VLAN 40 in Figure 1-1 for example.
Web Cache Redirection Configuration
Configuration Prerequisites
z The route between the switch and the Web cache server is reachable, and the Web cache function
is enabled on the Web cache server.
z The IP address and MAC address of the Web cache server and the VLANs whose HTTP traffic is to
be redirected to the Web cache are configured.
z The port through which the switch is connected to the Web cache server and TCP port number
used by HTTP are determined.
Configuration Procedure
You can configure Web cache redirection in system view or Ethernet port (connecting with the Web
cache server) view.
Follow these steps to configure Web cache redirection in system view:
To do… Use the command… Remarks
Enter system view system-view —
Configure Web cache server
parameters
webcache address ip-address
mac mac-address vlan vlan-id
port interface-type
interface-number [ tcpport
tcpport-number ]
Required
Not configured by default.
Specify a VLAN whose HTTP
traffic is to be redirected to the
Web cache server
webcache redirect-vlan
vlan-id
Required
By default, no HTTP packet is
redirected to the Web cache
server.