Table of Contents

Chapter 1 Web Cache Redirection Configuration. 1-1

1.1 Overview. 1-1

1.2 Web Cache Redirection Configuration. 1-2

1.2.1 Configuration Prerequisites. 1-2

1.2.2 Configuration Procedure. 1-2

1.2.3 Configuration Example. 1-3

 

Chapter 1  Web Cache Redirection Configuration

 

 

1.1  Overview

Hypertext transfer protocol (HTTP) is one of the most widely used approaches to access the Internet. Ethernet switch provides Web cache redirection function, which helps relieve the pressure on the links connecting to WANs and improve the speed to access the Internet. The following figure shows an implementation of Web cache redirection.

Figure 1-1 Web cache redirection

As shown in the figure, PC is one of the users in the LAN connected to the switch, and Web cache is the server that stores the Internet information often browsed by the users in the LAN. When Web cache redirection is enabled on the switch, the access to the Internet via HTTP is redirected to Web cache. If the desired contents are in the Web cache, the Web cache directly forwards them to users, thus eliminating the access to the Internet. If the cache does not have the information, the users will log onto the Internet to obtain information.

1.2  Web Cache Redirection Configuration

1.2.1  Configuration Prerequisites

l           The route between the switch and Web cache is reachable, and the Web cache function is enabled on the Web cache.

l           The IP address and MAC address of the Web cache and the VLANs whose HTTP traffic is be redirected to the Web cache are determined.

l           The port through which the switch is connected to the Web cache and TCP port number used by HTTP are determined.

1.2.2  Configuration Procedure

Table 1-1 Configure Web cache redirection in system view

Operation	Command	Description
Enter system view	system-view	—
Configure Web cache parameters	webcache address ip-address mac mac-address vlan vlan-id port interface-type interface-number [ tcpport tcpport-num ]	Required
Specify a VLAN whose HTTP traffic is to be redirected to the Web cache	webcache redirect-vlan vlan-id	Required You can specify multiple VLANs for Web cache redirection so that the HTTP traffic of the users in these VLANs can be redirected to the Web cache. By default, HTTP traffic is not redirected to the Web cache.
Display Web cache redirection configuration and the state of the Web cache	display webcache	Optional This command can be executed in any view.

 

Table 1-2 Configure Web cache redirection in Ethernet port view

Operation	Command	Description
Enter system view	system-view	—
Enter Ethernet port view	interface interface-type interface-number	—
Configure Web cache parameters	webcache address ip-address mac mac-address vlan vlan-id [ tcpport tcpport-num ]	Required
Quit to system view	quit	—
Specify a VLAN whose HTTP traffic is to be redirected to the Web cache	webcache redirect-vlan vlan-id	Required You can specify multiple VLANs for Web cache redirection so that the HTTP traffic of the users in these VLANs can be redirected to the Web cache. By default, the HTTP traffic is not redirected to the Web cache.
Display Web cache redirection configuration and the state of the Web cache	display webcache	Optional This command can be executed in any view.

 

 

1.2.3  Configuration Example

I. Networking requirements

In a company, the marketing department is located at VLAN10 connected to Ethernet 1/0/1 of the switch, R&D department is located at VLAN20 connected to Ethernet1/0/2, and President’s office at VLAN30 connected to Ethernet1/0/3. VLAN10 is in the network segment 10.15.17.1/24, VLAN20 in 10.15.18.1/24, and VLAN30 in 10.15.19.1/24. The IP address of the Web cache is 10.15.20.2, MAC address is 000f-e20f-0101, and the Web cache VLAN is VLAN40. Ethernet3/0/4 of the switch connects to the Web cache. It is required to enable Web cache redirection to redirect the HTTP traffic of R&D department, marketing department, and President’s office.

II. Networking diagram

1): VLAN 10, Marketing Dept.	2): VLAN 20, R&D Dept.
3): VLAN 30, President’s Office	4): VLAN 40, VLAN where Web cache is located

Figure 1-2 Networking diagram for Web cache redirection configuration

III. Configuration procedure

# Configure the VLAN for marketing department on the switch.

<H3C> system-view

[H3C] vlan 10

[H3C-vlan10] port Ethernet 1/0/1

[H3C-vlan10] quit

[H3C] interface Vlan-interface 10

[H3C-Vlan-interface10] ip address 10.15.17.1 255.255.255.0

# Configure the VLAN for R&D department on the switch.

[H3C] vlan 20

[H3C-vlan20] port Ethernet 1/0/2

[H3C-vlan20] quit

[H3C] interface Vlan-interface 20

[H3C-Vlan-interface20] ip address 10.15.18.1 255.255.255.0

# Configure the VLAN for President’s office on the switch.

[H3C] vlan 30

[H3C-vlan30] port Ethernet 1/0/3

[H3C-vlan30] quit

[H3C] interface Vlan-interface 30

[H3C-Vlan-interface30] ip address 10.15.19.1 255.255.255.0

# Configure the VLAN where Web cache is located on the switch.

[H3C] vlan 40

[H3C-vlan40] port Ethernet 1/0/4

[H3C-vlan40] quit

[H3C] interface Vlan-interface 40

[H3C-Vlan-interface40] ip address 10.15.20.1 255.255.255.0

# Enable Web cache redirection function on the switch.

[H3C] webcache address 10.15.20.2 mac 000f-e20f-0101 vlan 40 port Ethernet1/0/4

[H3C] webcache redirect-vlan 10

[H3C] webcache redirect-vlan 20

[H3C] webcache redirect-vlan 30