User guide

E
XTREME
W
ARE
S
OFTWARE
U
SER
G
UIDE
17-23
H
EALTH
C
HECKING
P
ING
-C
HECK
Ping-check is Layer 3 based pinging of the physical node. The default ping frequency is
one ping generated to the node each 10 seconds. If the node does not respond to any
ping within a timeout period of 30 seconds (3 ping intervals), then the node is
considered down.
P
ING
-C
HECK
C
OMMANDS
To enable ping-check, use this command:
enable slb node <ipaddress> ping-check
To disable ping-check, use this command:
disable slb node <ipaddress> ping-check
TCP-P
ORT
-C
HECK
TCP-port-check is Layer 4 based TCP port open/close testing of the physical node. The
default frequency is 30 seconds and the default timeout is 90 seconds. Port-checking is
useful when a node passes ping-checks, but a required TCP service (for example, httpd)
has gone down. If the httpd daemon running on TCP port 80 crashed, that would cause
a layer 4 port-check on port 80 to fail, because no TCP socket could be opened to that
port. If this continues for the duration of the specified port-check timeout, the IP/port
combination is considered down.
TCP-P
ORT
-C
HECK
C
OMMANDS
To enable tcp-port-check, use this command:
enable slb node <ipaddress>:<L4Port> tcp-port-check
To disable tcp-port-check, use this command:
disable slb node <ipaddress>:{<L4Port> | all} tcp-port-check