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NetStructure™ 480T Routing Switch User Guide
The 480T routing switch also supports external health checking.
External health checking uses an external service configured by the
user to perform health checks and uses SNMP (Simple Network
Management Protocol) as a mechanism to notify the switch of a
server failure.
Ping-Check
Ping-check is Layer 3-based pinging of the physical node. The
default ping frequency is one ping generated to the node every 10
seconds. If the node does not respond to any ping within a timeout
period of 30 seconds (3 ping intervals), the node is considered
down.
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-Port-Check
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, HTTP) has gone down. If the
HTTP service 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.
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