monitoring router-interfaces

[Cook, Garry]

nagios-users-admin at lists.sourceforge.net wrote:
> Alexander Schaefer wrote:
>> I am testing this both plugins at the moment and i am not shure
>> which one i should prefere... Following cognitions:
>> 
>> check_ifstatus  - seems to work well, but i do not understand why it
>> says: "OK: host 'xx.yy.zz.aa.', interfaces up: 3, down: 0, dormant:
>> 0" Allthough i only have 2 active interfaces on this router:
>> FastEthernet0 and Serial0, The BRI0 is in standby state. 
>> 
> 
> You also have loopback and probably Null interface. Try;
> 
> snmpwalk -m: -v 1 -c <community> aa.bb.cc.dd -On .1.3.6.1.2.1.2.2.1.2
> 
> and you'll see what interfaces the device thinks it has.

After reading Andreas' reply, I used the command he suggested to see the
interfaces on my router. This particular router reports 5 active
interfaces when queried with check_ifstatus. Serial0 is shutdown, so
check_ifstatus pays no attention to it. Therefore, it looks like
check_ifstatus considers both the Loopback and Null interfaces
Administratively and Operationally 'up'.

.1.3.6.1.2.1.2.2.1.2.1 = STRING: "Ethernet0"
.1.3.6.1.2.1.2.2.1.2.2 = STRING: "Serial0"
.1.3.6.1.2.1.2.2.1.2.3 = STRING: "Serial1"
.1.3.6.1.2.1.2.2.1.2.4 = STRING: "Null0"
.1.3.6.1.2.1.2.2.1.2.5 = STRING: "Loopback0"
.1.3.6.1.2.1.2.2.1.2.6 = STRING: "Serial1.777"
/usr/local/nagios/libexec: 

Garry W. Cook, CCNA
Network Infrastructure Manager
MACTEC, Inc. - http://www.mactec.com/
303.308.6228 (Office) - 720.220.1862 (Mobile)


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