I have just started in a new company and they have WhatsUp Gold monitoring their network.
We have recieved an email alert for a router voip-null0 interface going down for a couple of minutes and then back up again!
I have searched the web but I can't see what the interface is or does....I assume it has something to do with the routers voice capability but I am not sure what or why we would be monitoring it as an interface.
Any light shed on this topic would be greatly appreciated as always
Null0 interface is the graveyard for any packet sent to it. It is a virtual interface and it is where all packets sent to it meets a horrible death! . Any traffic sent to this interface never comes back alive..To understand it better you can refer to this doc and thread
I understand the concept of a standard Null 0 interface, but my question was referring to the voip-null0 interface which i couldn't see the point of . I have however had a read of the links you posted and gave myself a little refresher so that was nice
Now I know the voip-null0 interface is cosmetic I am going to remove it as a monitored interface within WhatsUp Gold. However I still don't know how it failed to respond to icmp ping if it's logical and the router and all other interfaces remained up!
Most likely it wasn't an ICMP-ping issue but SNMP-get issue ) I mean that your monitoring system probably collects the snmp-status of your gateway and reacts on the loss of the voip-null0 interface (due to CEF off/on for example) like you've mentioned.
IntroductionCUCM Routing RulesDial String implementation PolicyCUCM Routing LogicSIP URI Call Routing Analysis+++ Case Study: 1 ++++++ Case Study: 2 +++Conclusion
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