Intel 1520 User Manual

Page of 176
Chapter 4 Configuring the Appliance
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✔ If it takes the appliance more than 750 milliseconds, it begins to shed 50% of 
its load. 
✔ If the fresh-hit transaction time exceeds 1000 milliseconds, the appliance 
begins to shed 100% of its load.
Load shedding is temporary; when hit-transaction times return to acceptable 
levels, the appliance reverts to handling all incoming requests.
The following table describes the options.
Enabling SNMP agents
The SNMP section lets you enable an SNMP agent to monitor information about 
the appliance and send warning messages, called SNMP traps, to SNMP 
monitoring stations. 
The following table describes the options.
Option  
Description 
HTTP hit transaction time - low 
watermark
The lower limit for HTTP transaction 
time in milliseconds. 
When the average hit transaction time 
reaches this value, the appliance 
forwards a percentage of incoming 
client requests directly to the origin 
server. 
HTTP hit transaction time - high 
watermark
The upper limit for HTTP transaction 
time in milliseconds. 
When the average hit transaction time 
reaches this value, the appliance 
forwards all incoming client requests 
directly to the origin server.
Option  
Description 
SNMP Agent on/off
Enables or disables an SNMP agent. 
The appliance SNMP agent supports 
access to two management 
information bases (MIBs): MIB-2 (a 
standard MIB) and the Intel 
NetStructure Cache Appliance MIB. 
Enabling the SNMP agent on allows 
access to both.