Host checks and parents (Down/Unreachable)

[Steve Loughran]

Hi all

Long *LONG* time happy user of Nagios, but havent needed to ask any
questions for an awful long time.

=======

OK, here we go:

Example:

Nagios Host

router #1 (direct connection to Nagios host subnet)

router #2 (next hop, has router #1 as parent)

If the routing gets changed so traffic to router #2 does not pass through
router #1, and router #1 is taken offline (and shown as "DOWN"), will Nagios
show router #2 down due to the parent being offline? Will it do a host check
anyway, or will it try to save time and not bother, assuming that is router
#1 is offline then router #2 must be unreachable?

Or put to another way, is the host check run if its parent failed its own
host check? And is the unreachable status created by the host check, or by
the fact that its parent is marked as DOWN?

Silly long-winded question I know... sorry...

Many thanks for your help, it is greatly appreciated.

Steve



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