Seeking alert logic to ensure that exactly one of two ports is up

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1

Hi All.

On my switch I have two ports that represent active / failover links to another site. For my configuration I need exactly one of these two ports to be up. I have been trying to configure a rule for this but am not sure it is possible with librenms.

eg. I need an alert if the following statement is true:

(( PORT_A is down && PORT_B is down ) OR ( PORT_A is up && PORT_B is up ))

valid states (no alert please) are either of:

(( PORT_A is up && PORT_B is down ) OR ( PORT_A is down && PORT_B is up ))

Hoping that someone has an idea as to how this can be achieved natively within LibreNMS

2

Did you try entering that logic into the alert builder?

3

Without an OR operator I am not sure how to.

The alert is due only if they are:

((both up) OR (both down))

4

I don’t think this will work as you can’t match that a port is PORT_A AND PORT_B, it can only be one or the other.

5

Is your install up-to-date? There is definitely an or operator.

6

But you still can’t alert that something is two ports, it would have to be PORT_A OR PORT_B.

7

I thought alerting worked like this 0 items found “ok”, 1 or more items found “alert”.

8

It does but one entry in the DB can’t be both at the same time which is what the original query was doing.

SELECT * FROM ports WHERE ifName='Gi0/1' AND ifName='Gi0/2'; would not work.

9

yes but if you group them with the api builder, it could work.
It would take 5 groups

10

But that’s basically the OR part which is what I’ve said all along :slight_smile: