Technical data

48 ServerIron ADX Graphical User Interface Guide
53-1002412-01
Global traffic settings
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3. Provide the following information:
• Load Balancing Predictor: Select the algorithm to determine the traffic distribution among
the real servers. The algorithm can be one of the following:
 Round Robin—Directs the service requests to the next server if a server fail, and treats
all servers equally regardless of the number of connections.
 Weighted—Distributes the service requests by allocating all the required connections
sequentially to the servers with a higher weight value first.
 Enhanced Weighted—Distributes the service requests by allocating all the required
connections sequentially to the servers until each real server has connections equal
to its assigned weight.
 Weighted Round Robin—Schedules a proportional share of the bandwidth when all
servers are active, and redistributes bandwidth if the bandwidth have been reserved
by an inactive real server.
 Weighted Round Robin Static—Distributes the service requests based on a configured
weight value and system capacity.
 Dynamic Weighted Direct—Distributes the service requests based on the direct weight
from the SNMP response.
 Dynamic Weighted Reverse—Distributes the service requests based on the difference
of the maximum based value and the dynamic SNMP response value.
 Response Time—Distributes the service requests among real servers based on a
dynamic weight value derived from the response time of health check packets.
NOTE
The OID Entry ID and Max Value options are enabled only when you select the load balancing
predictor algorithms as Dynamically weighted Direct and Dynamic Weighted Reverse.
• OID Entry ID: Enter the SNMP request entry identification number that represents the
weight of the real server. The range is from 1 through 255.
• Max Value: Enter the maximum value for the dynamic weighting. The range is from 0
through 4,294,967,295.
• Reassign Threshold: Enter the SYN ACK threshold that specifies the number of contiguous
unacknowledged SYN ACKs accumulated for a real server, before determining that the real
server is inactive.The range is from 6 through 4,000. The default is 20.
• TCP Age: Specify the number of minutes the device allows a TCP connection to remain
inactive before closing the connection. The range is from 2 through 60 minutes. The
default is 30 minutes.
• UDP Age: Specify the number of minutes the device allows a UDP connection to remain
inactive before closing the connection. The range is from 2 through 60 minutes. The
default is 5 minutes.
• Sticky Age: Specify the number of minutes a sticky server connection can remain inactive
before aging out. The range is from 2 through 60 minutes. The default is 5 minutes.
• Clock Scale: Enter a value to adjust the clock scale for configurations that require TCP or
UDP timeouts longer than the maximum value. The range is from 1 through 24. The default
is 1. For example, when you set the clock scale to 2, then a TCP age of 60 minutes would
be equivalent to 120 minutes.
• Source NAT: Select to Enable check box to globally enable the source NAT on the real
servers.