Cabletron Systems SSIM-R8-02 Especificações descarregar pdf (Página 275)

Enterasys Xpedition User Reference Manual 255

Load Balancing

This feature allows a range of source IP addresses (with different port numbers) to be sent

to the same load balancing server. This is useful where client requests may go through a

proxy that uses Network Address Translation or Port Address Translation or multiple

proxy servers. During a session, the source IP address can change to one of several

sequential addresses in the translation pool; the netmask allows client requests to be sent

to the same server.

Optional Group or Server Operating Parameters

There are several commands you can specify that affect the operating parameters of

individual servers or the entire group of load balancing servers. In many cases, there are

default parameter values and you only need to specify a command if you wish to change

the default operation. For example, you can specify the policy to be used for distributing

the workload for a group of load balancing servers. By default, the XP assigns sessions to

servers in a round-robin (sequential) manner.

Specifying Load Balancing Policy

The default policy for distributing workload among the load balancing servers is “round-

robin,” where the XP selects the server on a rotating basis without regard to the load on

individual servers. Other policies can be chosen for the group, including least loaded,

where the server with the fewest number of sessions bound to it is selected to service a

new session. The weighted round robin policy is a variation of the round-robin policy,

where each server takes on new sessions according to its assigned weight. If you choose

the weighted round robin policy, you must assign a weight to each server that you add to

the load balancing group.

To specify the load balancing policy, enter the following command in Configure mode:

Note: These policies only affect groups created with the parameter protocol tcp; groups

created with the parameter protocol udp are load-balanced using a fixed IP-hash

policy.

Specifying a Connection Threshold

By default, there is no limit on the number of sessions that a load balancing server can

service. You can configure a maximum number of connections that each server in a group

can service.

Specify load balancing policy.

load-balance set policy-for-group <group name> policy

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Cabletron Systems SSIM-R8-02 Especificações Página 275