Brocade Communications Systems ServerIron ADX 12.4.00 Service Manual download pdf (Page 103)

ServerIron ADX Advanced Server Load Balancing Guide 91

53-1002435-01

Sample configurations

Policy based caching configuration

The following configuration implements the topology described in Figure 22.

Asymmetric TCS (FastCache)

Traffic in typical TCS configurations passes through the ServerIron ADX both from the client to the

cache and from the cache to the client. The ServerIron ADX uses the cache responses to the client

to diagnose the health of the cache server.

If the cache server responds to the client requests the ServerIron ADX redirects to the cache server,

the ServerIron ADX knows that the cache server is healthy. However, if the cache server stops

sending replies to the client requests, the ServerIron ADX assumes that the cache server is down

and stops redirecting requests to that cache server.

Some configurations are asymmetric—traffic from the cache server to the client does not pass back

through the ServerIron ADX. For example, caches that support multiple NICs might at the same

time support only one default gateway. Figure 23 shows a configuration in which a cache server’s

default gateway is configured to go to the customer access router (RAS) instead of the ServerIron

ADX. In this configuration, the ServerIron ADX does not see cache responses to client requests.

Because the ServerIron ADX does not see responses coming from the cache server, the ServerIron

ADX assumes that the cache server is down and stops redirecting requests to that cache server.

You can override this behavior by enabling the FastCache feature. This feature configures the

ServerIron ADX to continue redirecting client requests to a cache server even though the ServerIron

ADX does not see responses from the cache server. You enable the feature individually for real

servers.

ServerIronADX(config)#server cache-name ch1 40.40.40.100

ServerIronADX(config-rs-ch1)#port http

ServerIronADX(config-rs-ch1)#exit

ServerIronADX(config)#server cache-name ch2 40.40.40.101

ServerIronADX(config-rs-ch2)#port http

ServerIronADX(config-rs-ch2)#exit

ServerIronADX(config)#server cache-name ch3 40.40.40.102

ServerIronADX(config-rs-ch3)#port http

ServerIronADX(config-rs-ch3)#exit

ServerIronADX(config)#server cache-name ch4 40.40.40.103

ServerIronADX(config-rs-ch4)#port http

ServerIronADX(config-rs-ch4)#exit

ServerIronADX(config)#server cache-group 1

ServerIronADX(config-tc-1)#cache-name ch1

ServerIronADX(config-tc-1)#cache-name ch2

ServerIronADX(config-tc-1)#filter-acl 101

ServerIronADX(config-tc-1)#exit

ServerIronADX(config)# server cache-group 2

ServerIronADX(config-tc-2)#cache-name ch3

ServerIronADX(config-tc-2)#cache-name ch4

ServerIronADX(config-tc-2)#filter-acl 102

ServerIronADX(config-tc-2)#exit

ServerIronADX(config)# server cache-bypass 103

ServerIronADX(config)# access-list 101 permit tcp any host 1.1.1.1

ServerIronADX(config)# access-list 102 permit tcp any host 1.1.1.2

ServerIronADX(config)# access-list 103 permit tcp any host 1.1.1.3

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