circular parent/child chain

[Giles Coochey]

On 17/11/2012 17:08, Lucy Pelzer wrote:
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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 |
>        ------------     ------------
Hi Lucy,

Although you have redundant physical interconnects for your switches, 
Spanning Tree, or Rapid Spanning Tree or even Multiple Spanning Tree 
protocols are taking effect and (probably) setting switch-1 as the Root 
with the other switches set to a higher spanning tree priority value - 
in any case, at layer two, during normal operation you don't have 
multiple active parents in the layer-2 infrastructure.

While you have redundancy, physically for your infrastructure, you are 
only using those links (for each VLAN at least), in a non-redundant way.

Setup your Nagios child / parent relationships as per spanning tree has 
worked out how it should be when everything is up, add some monitoring 
for spanning-tree within Nagios, that way everything will work, and 
you'll always be informed when something is wrong.

Thanks

Giles


> 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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-- 
Regards,

Giles Coochey, CCNA, CCNAS
NetSecSpec Ltd
+44 (0) 7983 877438
http://www.coochey.net
http://www.netsecspec.co.uk
giles at coochey.net


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Monitor your physical, virtual and cloud infrastructure from a single
web console. Get in-depth insight into apps, servers, databases, vmware,
SAP, cloud infrastructure, etc. Download 30-day Free Trial.
Pricing starts from $795 for 25 servers or applications!
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