Extreme Networks Px Series - Manual (Page 52)

5-2 Px Series Application Switch Installation and Configuration Guide
answer requests. Servers can share an IP address, but the port must be unique for
each server.
• Max-connections represents the maximum number of concurrent connections this
server can handle. After that number is reached, no more connections are sent to that
particular server until some of the open ones have been closed (unless a persistence
method is specified; see “Persistence Modes” on page 6-2). Most servers can handle
fewer than 5,000 connections.
• Weight is used by weighted algorithms for load balancing. Use equal weights for all
servers (or 1 for simplicity’s sake) with non-weighted algorithms. See Chapter 6.
If servers are configured at contiguous IP addresses, and have identical attributes, you
can specify many identical servers at once using a range of IP addresses. The specified
index is used for the first server and incremented for each configured server. The
following example creates servers with indexes 3 through 10:
config server index 3 ipaddress 10.2.2.2 - 10.2.2.9 port 80
max-connections 4000 weight 1
To remove a server or range of servers from the system, use the following commands:
unconfig server index <index>
unconfig server index <index> - <index2>
unconfig server ipaddress <ipaddress>
unconfig server ipaddress <ipaddress> - <ipaddress>
Configuring Server Groups
After all of the servers needed for a particular virtual service have been created, they
must be organized into a server group. This group is used in the definition of the virtual
service itself. The following command creates a server group:
config server-group name <string> policy [rr | wrr | lc | wlc]
Each server group definition includes a unique name, used when configuring the server
group or used elsewhere in the configuration. A load balancing policy is the method of
choosing servers. See Chapter 6 for policy details.
You can optionally specify a server of last resort for the group. This is a server to which
traffic is sent if all the servers in a server-group are down. It could be a server that
simply replies to the client with a "SYSTEM DOWN" message, or a server that can
service the request under emergency circumstances (perhaps a development machine or