Technical data

44 Brocade ServerIron ADX Advanced Server Load Balancing Guide
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Configuring transparent cache switching
2
Enabling transparent cache switching
When TCS is enabled, the feature detects web traffic addressed for output to the Internet and
redirects the traffic to the CPU, which processes the traffic and forwards it to the cache servers
instead. TCS can be defined on either a global or local basis as described:
• globally – If TCS is enabled on a global basis, all ports redirect web traffic toward the cache
servers. Globally assigning TCS to all ports eliminates the need to individually configure ports
added in the future.
• locally – If TCS is enabled on a local basis only web traffic that is outbound from a specified
ethernet port (or ports) will be directed toward the cache servers.
To enable TCS for HTTP traffic on all interfaces (globally) of the ServerIron ADX shown in Figure 9 on
page 34, enter a command such as the following.
NOTE
The command for enabling TCS is different if you are running a switch image or a router image on
the ServerIron ADX as shown.
When running a switch image
ServerIronADX(config)#ip policy 1 cache tcp 80 global
Syntax: ip policy index cache {tcp | udp} portnum { global | local }
When running a router image
ServerIronADX(config)#ip l4-policy 1 cache tcp 80 global
Syntax: ip l4-policy index cache {tcp | udp} portnum { global | local }
The index variable specifies the index value for the policy. This number can be any unused number
from 1 – 64. Thus, up to 64 IP policies can be defined on a ServerIron ADX. You can use the show
ip policy command to display the session policies that have been defined.
The portnum variable after TCP/UDP refers to the traffic which should be redirected to a cache
server. The portnum variable is a non-wellknown-port to enable caching for any traffic destined to a
non-well-known port (>1024), do not include the port number. Instead, configure a policy where the
portnum variable is set to “0”. For example, where you want to configure traffic to be redirected
from port 8080 to a cache server, the portnum variable will be set to “0” as shown in the following.
ServerIronADX(config)#ip policy 1 cache tcp 0 global
NOTE
In this configuration, the policy with a portnum variable of “0” only needs to be configured once to
support all non-well-known ports.
Where the global parameter is used, web traffic from all ports on the ServerIron ADX will be
redirected toward the cache servers.
Where the local parameter is used, only web traffic that is outbound from a configured ethernet
port will be directed to the cache servers. In this configuration, the ip policy command specifies
that TCS is enabled locally. You must then configure each port whose outbound traffic you want to
direct to the cache servers to use the previously configured IP policy.