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.

Option

Description

 

 

HTTP hit transaction time - low

The lower limit for HTTP transaction

watermark

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

The upper limit for HTTP transaction

watermark

time in milliseconds.

 

When the average hit transaction time

 

reaches this value, the appliance

 

forwards all incoming client requests

 

directly to the origin server.

 

 

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

 

 

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.

 

 

Chapter 4 Configuring the Appliance

29

Page 41
Image 41
Intel 1520 manual Enabling Snmp agents