HP Traffic Director sa7220 - Manual (Page 249)

C H A P T E R 7 Using SNMP
237
hpbroker-mib.my
hpbroker-mib.my defines objects and traps for Layer 4 load
balancing. hp broker-mib.my also contains objects and traps
related to server availability, the SA8220’s CPU utilization, and its
operational status. The hp
broker-mib.my objects and traps are
discussed below.
Server Availability (Ping)
NOTE: The Intelligent
Resource Verification
(IRV) CLI command is
config irv interval> (default value
is zero). To make the
serverPingTable active,
ensure that the (IRV)
ping-interval is NOT set
to zero. The serverPingTable can be used to monitor server availability.
If a server is responding to periodic ping requests from the SA8220,
then its state is marked as
responding . Otherwise, the server is
marked as notResponding . Whenever a server's Ping state toggles,
the trap serverPingNormal or serverPingAlert is sent for
that server.
Server TCP Connection
The performance of TCP connections between the SA8220 and
servers are monitored. This performance data is stored in the
serverTcpTable . For each configured server mapping used for
load balancing a service (VIP, PORT), the following data is
maintained in the
serverTcpTable :
state, up or down ( serverState )
how long this server has been up ( serverUpTime )
response time ( serverRspTm )
number of established TCP connection instances
( serverConnCnt )
TCP connections established per second
( serverCps )
Trap thresholds are available in the MIB for serverRspTm ,
serverConnCnt and serverCps . Different threshold settings can
be configured for each server TCP connection in
serverTcpTable .
Trap thresholds for server response time can be configured so that a
trap is sent if the response time reaches a specified value. When
serverRspTm reaches serverRspTmHiWater , a
serverRspTmAlert trap is sent. While in alert, if serverRspTm
dips to serverRspTmLoWater , a serverRspTmNormal trap is
sent. High- and low- water thresholds provide hysteresis and prevent
the spurious generation of traps. If the high-water threshold is set to
0, no traps are sent.