Monitoring Redundant path routers

[Samuel Petreski]

Peter,

Thank you very much for replying to my post. I thought of using SNMP traps
in order to be able to accomplish this, but what if the interface of the
Router goes down to which I send the SNMP traps? Nagios than is going to
think that the whole Router is down, which is not correct.

If I send traps to Interface 192.168.0.10 on Router 3, and that interface is
down, the router is not necessarily down, only the that interface.

--Samuel

-----Original Message-----
From: Peter Gutmann [mailto:peter.gutmann at db.com]
Sent: Monday, April 26, 2004 1:12 PM
To: Spencer Horn <shorn
Cc: nagios-users at lists.sourceforge.net;
nagios-users-admin at lists.sourceforge.net; petreski at ksu.edu
Subject: Re: [Nagios-users] Monitoring Redundant path routers

Why can't you use SNMP for this? The line up and the line down events
should generate SNMP traps. At the very least, could you use SNMP mib to
poll the status of the device....

----
Peter Gutmann
Peter.Gutmann at db.com
-----Original Message-----
From: nagios-users-admin at lists.sourceforge.net
[mailto:nagios-users-admin at lists.sourceforge.net]On Behalf Of Samuel
Petreski
Sent: Monday, April 26, 2004 12:33 PM
To: nagios-users at lists.sourceforge.net
Subject: [Nagios-users] Monitoring Redundant path routers

Hi,

I was looking into using Nagios for Enterprise wide monitoring and am very
impressed with all the capabilities, but ran into following question:

                                      192.168.0.1          192.168.0.2
192.168.1.21
                        --------------------                            ----
----------------192.168.1.1           --------------------
                        | Router 1     |----------------------------| Router
2     |----------------------------|  Nagios       |
                        --------------------                            ----
----------------                            --------------------
                  192.168.0.9 \
/  192.168.0.5
                                     \
/
                                      \
/
                                       \
/
                                        \
/
                                         \                                /
                                          \                             /
                                           \                          /
                                            \                       /
                                             \                    /
                                              \                 /
                            192.168.0.10\               / 192.168.0.6
                                              --------------------
                                              | Router 3     |
                                              --------------------
                                                      |  192.168.2.1
                                                      |
                                                      |  192.168.2.2
                                                -------------
                                                | Switch1|
                                                -------------

Can Nagios monitor the individual interfaces between the routers in order to
inform me when a link/interface goes down? I’m mainly interested if
monitoring Router 3, to have Router 1 and Router 2 as dependencies, but also
to know if the link between Router 1 and Router 2 goes down, because Nagios
will be able to reach Router 3 through the link between Router 2 and Router
3.

Any help would be greatly appreciated and if further information is
required, please feel free to let me know.

--Samuel

P.S. If this is a cross post, please let me know where I can find the
original post.
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