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C H A P T E R 18 Server Load Balancing (SLB)
371
Service-Check
Service-check is Layer 7-based and application-dependent. It is
defined on a VIP and is performed on each node in the pool with
which this VIP is associated. The default frequency is 60 seconds
and the default timeout is 180 seconds. Each service check has
associated parameters that you can set. These parameters are
described in Table 18.3.
If the service-check parameters are not specified on an individual
node or VIP, the global default values for these parameters are used.
The global defaults are configurable, so you can change them to
your most often used parameters.
In the case of HTTP service-checking, you can specify the URL of
the Web page to be retrieved, such as /index.html. You can also
specify a match-string, such as Welcome, that is expected to be in
the retrieved Web page.
If the match-string is found in the first 1,000 bytes of the retrieved
Web page, the service-check passes on the particular node. A
match-string specifying the keyword any-content will match any
retrieved text. However, to distinguish valid data in the retrieved
Table 18.3: Service-Check Parameters
Service Attribute Global Default Value
HTTP URL
Match-string
/
Any-content
FTP Userid
Password
anonymous
anonymous
Telnet Userid
Password
anonymous
anonymous
SMTP DNS-domain Same as the switch DNS domain. If no DNS domain is
configured for the switch, the value is mydomain.com.
NNTP Newsgroup ebusiness
POP3 Userid
Password
anonymous
anonymous