Amer Networks E5Web GUI - Manual (Page 693)

• Ports
The port number for polling when using the TCP or HTTP option.
More than one port number can be specified in which case all ports will be polled and all
ports must respond for the server to be considered online. Up to 16 port numbers may be
specified as a comma separated list for each polling method.
• Interval
The interval in milliseconds between polling attempts. The default setting is 10,000 and the
minimum value allowed is 100 ms.
• Samples
The number of polling attempts used as a sample size for calculating the Percentage Loss and
the Average Latency. The default setting is 10 and the minimum value allowed is 1.
• Maximum Poll Failed
The maximum permissible number of failed polling attempts. If this number is exceeded then
the server is considered offline.
• Max Average Latency
The maximum number of milliseconds allowable between a poll request and the response. If
this threshold is exceeded then the server is considered offline.
Average Latency is calculated by averaging the response times from the server for Samples
number of polls. If a polling attempt receives no response then it is not included in the
averaging calculation.
10.4.6. Setting Up SLB_SAT Rules
The key component in setting up SLB are IP rules that have SLB_SAT as the action. The steps that
should be followed for setting up such rules are:
1. Define an IP address object for each server for which SLB is to be enabled.
2. Define an IP address group object which includes all these individual objects.
3. Define an SLB_SAT rule in the IP rule set which refers to this IP address group and where all
other SLB parameters are defined.
4. Define a further rule that duplicates the source/destination interface/network of the
SLB_SAT rule that permits the traffic through. This could be one rule or a combination of
rules using the actions:
• Allow
• NAT
Note: FwdFast rules should not be used with SLB
In order to function, SLB requires that the cOS Core state engine keeps track of
connections. FwdFast IP rules should not be used with SLB since packets that are
forwarded by these rules are under state engine control.
Chapter 10: Traffic Management
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