TWCB provides the ability to assign two probes to monitor a cache server. ICMP probe monitoring of a cache server occurs by default, using the predefined ICMP probe $twcb_default, assigned to probe one. See Preset Default ICMP Probes for preset default ICMP probe details.
Probes are assigned to a cache server configuration using the faildetect probe command in cache server configuration mode. When assigning a probe to a cache server, specify probe one or two, and the name of the probe. Any preexisting probe is overwritten when assigning a probe.
Default ICMP probes can not be assigned by specifying the name of the probe. When probe one has not been administratively configured, the default ICMP probe for that server context is auto-configured for probe one.
Layer 7 real server applications can be verified by configuring a TCP probe for application content verification.
This example shows how to:
System(su)->configure System(su-config)->probe TCP-HTTP tcp System(su-config-probe)->inservice System(su-config-probe)->acv request “GET / HTTP/1.1\\r\\nHost: 2.0.0.5\\r\\n\\r\\n” System(su-config-probe)->acv reply “HTTP/1.1 200 OK\\r\\n” System(su-config-probe)->show probe TCP-HTTP detail Probe: TCP-HTTP Type: tcp-acv Administrative state: inservice Session count: 1 Fail-detect count: 3 Pass-detect count: 3 Fail-detect interval: 5 Pass-detect interval: 5 3-way TCP handshake wait time: 5 Server response wait time: 10 Application Content Verification: Request-string: GET / HTTP/1.1\\r\\nHost: 2.0.0.5\\r\\n\\r\\n Reply-string: HTTP/1.1 200 OK\\r\\n Close-string: Search-Depth: 255 System(su-config-probe)->exit System(su-config)->ip twcb wcserverfarm s1Server System(config-twcb-wcsfarm)->cache 186.89.10.51 System(config-twcb-cache)->faildetect probe one TCP-HTTP System(config-twcb-cache)->faildetect app-port 8080 System(config-twcb-cache)->inservice System(config-twcb-cache)->