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Intel
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NetStructure™ 480T Routing Switch User Guide
Health Checking
The 480T routing switch supports both internal and external health
checking.
Health check definitions
For reference, the following health checks are available on all
Server Load Balancing, Web Cache Redirection and Policy-based
Routing functions. SLB functions test individual servers. Web
Cache Redirection and Policy-based routing functions test the next-
hops in accordance with the flow-redirection rules.
Layer 3 Ping Check
The default health checking is a simple ping check, where the
switch sends an ICMP ping packet to the configured server or next-
hop. If 3 replies are lost, the server or next-hop is set to down and
flows are not redirected to it. The ping check is the only health
checking that will work with a wildcard as the IP Port.
Layer 4 Port Check
The switch will attempt to establish a TCP connection to the server
or next-hop.
When using Web Cache Redirection or Policy Based Routing, the
Layer 4 port must be defined in the flow and opened on the next-hop
in order for the health check to succeed.
Layer 7 HTTP Check
The HTTP health check will download a specific page from the
server or next-hop configured for the flow. The switch will then
search the page for a specific text string in the first 1000 bytes. If the
text string is found, the check passes. As an alternative you can
configure the check to accept any data from the downloaded page.
Layer 7 FTP Check
The FTP health check establishes an FTP connection between the
switch and the server or next-hop. The switch will attempt to log in