Brocade Communications Systems ServerIron ADX 12.4.00 Service Manual Page 55

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ServerIron ADX Advanced Server Load Balancing Guide 43
53-1002435-01
Configuring TCS
2
Assigning web cache servers to cache groups
TCS requires all cache servers to belong to a cache group. To assign cache servers to a different
cache group, use the server cache-group <number> command.
The ServerIron ADX uses one of two possible methods to distribute requests among the servers in a
cache group. These are the least-connection method or a hashing algorithm based on source and
destination IP addresses. The default method for HTTP and SSL protocols is the hashing algorithm
and the least-connection method for all other protocols. The method can be changed from the
default setting for all protocols. (Refer to “Selecting a method for server selection within a cache
group on page 52.)
In addition, cache groups provide automatic recovery from a failed or otherwise out-of-service web
cache server. If a web cache server failure occurs, ServerIron ADX detects the failure and directs
subsequent requests to the next available cache server or forwards the request directly to the WAN
link.
To assign cache servers 1 and 2 to the same cache group (as in Figure 9 on page 34), you first
create the server group and then assign the servers to the group, as shown in the following.
For IPv4
ServerIronADX(config)# server cache-group 1
ServerIronADX(config-tc-1)# cache-name server1
ServerIronADX(config-tc-1)# cache-name server2
For IPv6
ServerIronADX(config)# server cache-group 2 ipv6
ServerIronADX(config-tc-2)# cache-name server3
ServerIronADX(config-tc-2)# cache-name server4
Syntax: server cache-group <number> [ ipv6 ]
The <number> variable specifies an integer that identifies cache group you are creating. Up to 14
server cache groups can be assigned to a ServerIron ADX.
The ipv6 parameter specifes that the cache group being created is for IPv6 servers.
NOTE
You can gain additional reliability by using redundant ServerIron ADXs, thus eliminating any single
point of failure in the network path to the web cache server group.
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