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Author Topic: Warning Events: Duplicate IP (1.07) / is configured on (1.08-027)  (Read 2789 times)

Peter@Lichtenberg

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Hello,

with NeDi 1.08-027 I see following event at warning level:

 Source <CoreSwitch02>:  Info: 192.168.50.1/24 on Vl100 is configured on <CoreSwitch01>, <CoreSwitch02>

with NeDi 1.07 I see following event at warning level:

  Source <CoreSwitch02>: Info: Duplicate IP 192.168.50.1  found on <CoreSwitch01>, <CoreSwitch02>

Following configuration at both Cat6500 IOS 12.2 SXJ core switches:

 ...
  interface Vlan100
   description lan,staff, ...
   ip address 192.168.50.2 255.255.255.0
   no ip redirects
   glbp 100 ip 192.168.50.1
   glbp 100 priority 110
   glbp 100 authentication text xxx
   glbp 100 name staff
 ...

There are no warning events for Cat6500 IOS 12.2 SXH core switches with HSRP configuration.

At HP Blade Enclosures with Onboard Administrator Moduls I see following warning event:

  Source <VCD-Interconnect> : Info: 169.254.201.24/16 on tap0 is configured on <VCD-Interconnect>, <Onboard Administrator Modul>

Any ideas or hints what can be happen here and how to fix or filter it?

Regards

 Peter

rickli

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Re: Warning Events: Duplicate IP (1.07) / is configured on (1.08-027)
« Reply #1 on: March 24, 2013, 01:06:51 AM »
Interesting how IPs are handled differently, but I guess it makes sense, since HSRPs VIP is only at one box at the time...

You can turn off IP events by removing "i" or "I" from notify or filter on particular ones with "event delete" in Monitoring-Setup...
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Peter@Lichtenberg

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Re: Warning Events: Duplicate IP (1.07) / is configured on (1.08-027)
« Reply #2 on: March 24, 2013, 01:42:38 PM »
Hello Rickli,

I can confirm that at both core swtches the interfaces use the same virtual IP address for GLBP

$ snmpwalk  -m All -v 2c -c public <CoreSwitch01>  2>/dev/null | grep -e ipAdEntIfIndex | grep -e 192.168.50
RFC1213-MIB::ipAdEntIfIndex.192.168.50.1 = INTEGER: 223
RFC1213-MIB::ipAdEntIfIndex.192.168.50.2 = INTEGER: 223

$ snmpwalk  -m All -v 2c -c public <CoreSwitch02>  2>/dev/null | grep -e ipAdEntIfIndex | grep -e 192.168.50
RFC1213-MIB::ipAdEntIfIndex.192.168.50.1 = INTEGER: 154
RFC1213-MIB::ipAdEntIfIndex.192.168.50.3 = INTEGER: 154

Feature request for 1.08: IP used on other devs or just this one?

At inc/libsnmp.pm the warning event for duplicated configured IPs will created only if interface at this device is not shut. It works in one direction perfect. But if compare a no shut interface with a shut interface on an other device the warning event rises.

Thank you for the tips.

Regards

 Peter

rickli

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Re: Warning Events: Duplicate IP (1.07) / is configured on (1.08-027)
« Reply #3 on: March 24, 2013, 01:48:15 PM »
That's correct, for one it's IMHO not reliable enough to check the status of the other interface. In addition, the real problems start, if an unaware networker enables a shut port having a duplicate IP configured. That's why I decided to just generate a warning, if IP warnings are enabled. You could still drop particular ones as described above...
Please consider Other-Invoices on your NeDi installation for an annual contribution, tx!
-Remo