101 · Question #18
Which statement is correct if a TOPbased monitor is assigned to an LTM System and an HTTPbased monitor is assigned to one of that LTM System's Virtual Servers?
The correct answer is B. The Virtual Server status is based on the HTTP monitor only.. When monitors are assigned at both the LTM system level and the Virtual Server level, the more specific Virtual Server-level monitor takes sole precedence for that Virtual Server's status.
Question
Which statement is correct if a TOPbased monitor is assigned to an LTM System and an HTTPbased monitor is assigned to one of that LTM System's Virtual Servers?
Options
- AThe Virtual Server status is based on the TCP monitor only.
- BThe Virtual Server status is based on the HTTP monitor only.
- CGTM Systems do not allow monitors on both an LTM System and one of its Virtual Servers.
- DThe Virtual Server status is based on both the TOP and HTTP monitor; if either fails, the Virtual
- EThe Virtual Server status is based on both the TOP and HTTP monitor; if either succeeds, the
How the community answered
(49 responses)- A14% (7)
- B71% (35)
- C8% (4)
- D4% (2)
- E2% (1)
Why each option
When monitors are assigned at both the LTM system level and the Virtual Server level, the more specific Virtual Server-level monitor takes sole precedence for that Virtual Server's status.
The TCP monitor assigned at the LTM system level does not override or take precedence over the more specific HTTP monitor assigned at the Virtual Server level.
In F5 BIG-IP, a monitor assigned directly to a Virtual Server overrides any monitor applied at the broader LTM system level for that specific Virtual Server's status determination. The HTTP monitor attached to the Virtual Server is more specific and therefore is the only monitor used to evaluate whether that Virtual Server is available or unavailable.
GTM systems do support and allow monitors assigned at both the LTM system level and the Virtual Server level simultaneously; this is a valid and common configuration.
Both monitors do not collectively determine the Virtual Server status - only the more specific Virtual Server-level HTTP monitor is used, not a combination requiring either to fail.
The Virtual Server status is not determined by a logical OR of both monitors; only the HTTP monitor assigned at the Virtual Server level controls its status.
Concept tested: F5 BIG-IP monitor specificity and inheritance precedence
Source: https://techdocs.f5.com/en-us/bigip-16-1-0/big-ip-local-traffic-management-monitors-reference/big-ip-local-traffic-management-monitors-reference/types-of-monitors.html
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