3com 5500-ei pwr Installation Instruction

 

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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 

 for example. 

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. 

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: 

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.