Multiple interfaces, multiple parents

[Hugo van der Kooij]

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Tobias Klausmann wrote:
| Hey everybody,
|
| I've hit a snag when configuring parents for hosts. First a
| little bit about our setup.
|
| Most of our hosts have only one connected ethernet interface (if
| you don't count the management cards). Still, we have quite a
| handful of hosts (over 100) that have two interfaces.
|
| Up until now, we configured the "management address" as the
| address to use by Nagios. That is, Nagios uses the adress the
| admins use when SSH'ing to the box. If there are additional IPs
| that need monitoring, they're configured as services on the host
| they're bound to.
|
| We're now starting to migrate/integre monitoring of our switch
| setup into Nagios. We have a satellite switch per rack which in
| turn is connected redundantly to a pair of central switches.
|
| Now what we'd like is to have these rack-switches as parents to
| the hosts which are connected to them. Here, we run into a
| problem: those hosts that have two interfaces would have two
| parents, *both* of which should yield an "UNREACHABLE" message if
| *either* of them goes belly-up.
|
| Unfortunately, Nagios connects multiple parent hosts with logical
| AND, which means that the host only turns UNREACHABLE when *both*
| switches are gone.

The funny thing with redundant paths is that they are in fact redundant.
So if you loose one you still have connectivity and nothing becomes
unreachable.

So where is the flaw in this design in Nagios? If breaking a single link
~ will result in something becoming unreachable then you do not have true
redundancy.

Hugo.

- --
hvdkooij at vanderkooij.org               http://hugo.vanderkooij.org/
PGP/GPG? Use: http://hugo.vanderkooij.org/0x58F19981.asc

	A: Yes.
	>Q: Are you sure?
	>>A: Because it reverses the logical flow of conversation.
	>>>Q: Why is top posting frowned upon?

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