Brocade Communications Systems ServerIron ADX 12.4.00 Service Manual download pdf (Page 99)

ServerIron ADX Advanced Server Load Balancing Guide 87

53-1002435-01

Sample configurations

In a transparent caching scheme, the ServerIron ADX acts as the traffic redirector and the cache

servers accept requests for any destination IP address. A cache server that accepts requests for

any IP address are running in promiscuous mode. The client does not have to configure anything on

their web browser. Thus, the caching is “transparent” to the client. It is this transparent

characteristic that sets proxy-based caching and transparent caching apart.

In this example, suppose you want all traffic to be cached and you want to use the ServerIron ADX’s

default settings. To configure the ServerIron ADX for this example, you define the caches, assign

them to cache groups, and apply an IP policy.

Applying IP policies

For the simple case in which you want to cache everything no matter where it comes from or where

it is going to, use a global policy, such as the following.

ServerIronADX(config)# ip policy 1 cache tcp 80 global

By using a global policy, you can make rule 2 true for all ports. Rule 1 is true by default because all

ports are in cache group 1. Any HTTP traffic flowing across the switch is redirected to the caches.

You can accomplish the same thing with a local policy. With local policies you have to first define

and then apply the policy to the appropriate output ports. In this case, since you want to cache all

traffic, you need to apply the policy to the RAS and BAR ports.

ServerIronADX(config)# ip policy 1 cache tcp 80 local

ServerIronADX(config)# int e 4

ServerIronADX(config-if-4)# ip-policy 1

ServerIronADX(config-if-4)# int e 5

ServerIronADX(config-if-5)# ip-policy 1

ServerIronADX(config-if-5)# int e 6

ServerIronADX(config-if-6)# ip-policy 1

ServerIronADX(config-if-6)# int e 7

ServerIronADX(config-if-7)# ip-policy 1

ServerIronADX(config-if-7)# int e 8

ServerIronADX(config-if-8)# ip-policy 1

NOTE

Note the subtle syntax difference between the commands to create a local policy and apply a policy

to a port. If you leave the dash out of the command, the command does not work.

The local policies make rule 2 true for the BAR and RAS ports. Rule 1 is true by default. Local

policies provide better control at the cost of more configuration steps. If you add a BAR to port 10,

traffic destined for it is not redirected because you have not applied the policy to port 10. With a

global policy, traffic is redirected automatically.

Defining the caches

To make caching work, you need to apply an IP policy and you need to define the caches and assign

them to a cache-group. You define cache servers as follows.

ServerIronADX(config)# server cache-name C1 11.11.11.11

ServerIronADX(config)# server cache-name C2 11.11.11.12

ServerIronADX(config)# server cache-name C3 11.11.11.13

The ServerIronADX ARPs for these addresses to determine which ports the caches are on.

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Brocade Communications Systems ServerIron ADX 12.4.00 Service Manual Page 99

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