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C H A P T E R 7 HP Traffic Director Server Appliances User Guide

240

The traps redundantBrokerUp and redundantBrokerDown

are sent to alert the administrator of any changes in the availability of

the redundant Director.

hpl7-broker-mib.my

NOTE: This MIB is not

available on the SA7200.

hpl7-broker_mib.my defines objects and traps for Layer 7 load

balancing. The hp

l7-broker-mib.my objects and traps are

discussed below.

HTTP Monitor Table

A 24-hour history of HTTP performance is maintained in

httpMonTable. httpMonTable is indexed by hours of the day,

httpMonTable is indexed from 0 to 23. To get the current http

performance numbers, index the table by the current hour. Each entry

in the table contains the following information:

httpRedirects

httpErrsToClient

http606Redirects

http606ErrsToClient

invalidHttpReq

httpServerErrs

Using the Intelligent Session Recovery feature, the Director can be

configured such that if a server returns an HTTP error, the Director

intercepts the error and resubmits the HTTP request to another server

for fulfillment. Each server is tried in sequence until the HTTP

request is fulfilled. If the HTTP request is fulfilled, the client sees a

successful completion of the request. Otherwise, the client receives a

503 error from the Director.

httpRedirects is the number of times during the hour that the

Director redirected a request to a server.

httpErrsToClient is the

number of times during the hour that a 503 error is returned to the

client because all redirection attempts failed to fulfill an HTTP

request. A trap threshold,

httpErrsToClientTh, is available in

the MIB. If

httpErrsToClient reaches httpErrsToClientTh

during the current hour, a trap is sent.

httpErrsToClientTh can

be set to any positive number. If

httpErrsToClientTh is set to 0,

no trap is sent. Since the value of

httpErrsToClient during the

hour is accumulative and does not fluctuate, low and high water

thresholds are not necessary for hysteresis.

The SA8220 can be configured such that if a server returns an HTTP

606 error, the Director intercepts the error and resubmits the HTTP

request to another server for fulfillment. Each server is tried in

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