circular parent/child chain

[Lucy Pelzer]

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Hi List,

I am in charge for a big network infrastructure and at the moment we
evaluate solutions for our nagios monitoring with configuration via
monarch. I really would like to create the new solution with nagios and
puppet. There is only one big problem. In our infrastructure there are a
lot of switches connected together like this:

              ------------
              | switch-1 |
              ------------
                /       \
               /         \
              /           \
      ------------     ------------
      | switch-2 |-----| switch-3 |
      ------------     ------------
           |                 |
           |                 |
      ------------     ------------
      | switch-5 |-----| switch-4 |
      ------------     ------------

All the time I try to configure this switch connections in nagios with
more than one parent, where the hosts are at the same time parent and
child, I get the following error:

ERROR: The host 'switch-2' is part of a circular parent/child chain!
...

I know by now that this is because nagios has to be hierarchically, but
I do not understand why. Maybe somebody could tell me exactly why I
can’t configure this in nagios or better could tell me how I can do it.
I only found the explanation that this could conduct a deadlock. Maybe I
am wrong, but is this not a likely network infrastructure? At last it is
no problem to build something like this with STP running in your network.


Great Thanks in advanced

Lucy
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