Network Disconnection

[shaikh.zaid22]

I am facing a network disconnection issues in our company, the network typically disconnects and all the employees on VIOP, Microsoft teams and other users experience complete disconnection of their service. Within seconds it recovers and the users have to again connect back manually.

Since our company is of 200 emp and majority are using Teams for different purposes it makes more annoying and troublesome for us to resolve. Presently we do not have any monitoring tools as such to lookup to.

our infra consists of FTD in HA as internet edge and Core Sw 9704 and 13 access switches and 9800 WLC.

Where can i look for the issue? for the being i had requested the ISP to provide the bandwidth utilization report for that specific hour.

Really needs to fix this. 

[Oliver Kaiser]

The problem is rather generic so without any further information it will be hard to pinpoint what exactly is causing your issue. I think the first step should be to pinpoint what is causing your connectivity issues, I would suggest checking logs on WLC, your Core Switch and FTD to see if anything particular is happening at the time of your outage.

Apart from checking the logs I would suggest spinning up monitoring our internet connectivity path. Using tools like PingPlotter you could go ahead and create different ICMP monitors to check different paths like this

Client <-> Core Switch

Client <-> Core Switch <-> FTD

Client <-> Core Switch <-> FTD <-> ISP CPE

Client <-> Core Switch <-> FTD <-> ISP CPE <-> ISP PE Router

Client <-> Core Switch <-> FTD <-> ISP CPE <-> Some-Highly-Available-Internet Service

Using the monitoring data you should be able to find out where exactly you are encountering issues. If all monitor up to the ISP side

work fine, you know that you will have to work with your provider to find the issue on their side. If the monitoring already fails in your local network you will have to focus on the local network side.

[shaikh.zaid22]

Thanks oliver...very good steps you mentioned to look into... i will download pingplotter and do the needful..

Apart from that, i had a word with the ISP, they confirmed about the disconnection issue is from their end and their investigating team is onto it..

Thank again.

I will post the outcome from my end as well once i complete pingplotter.. 

[Mark Elsen]

                               > Presently we do not have any monitoring tools as such to lookup to.

  - You will need at least some baseline monitoring  to analyze potential issues. Start by using a common syslog-server for all involved components. Review the logs and or current active logging on the syslog-server and watch for anomalies or problem patterns (e.g).

 M.

[shaikh.zaid22]

Yes will definitely going for one in near future.. Secondly, going by the logs i do not see any major log indicating something different.