HP Traffic Director sa7220 - Manual (Page 252)

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