Daily Cisco 9300-nm-8x switch issue

[InformationSystems]

Every morning our work center has to come in and unplug the line which feeds our internet connection to our Cisco 9300 switch from our router in order to get our internet connection/entire network back up and communicating. Any reason why this is happening?

I think it would be best to reconfig my entire network into a plug and play solution. I have an ISR router that feeds a CISCO 9300 switch. If I reset these to default will they be regular plug and play systems?

[balaji.bandi]

what is the Logs show and what router it connected to

post the interface configfuration where this Router connected  to understand the issue ?

[InformationSystems]

honestly I would like to reconfig my entire network into a plug and play system and get rid of the vlans altogether.

[Giuseppe Larosa]

Hello @InformationSystems ,

it is difficult to say something meaningful without more details.

Check the log on both the switch and the router.

Verify on the router that you have a default static route like

ip route 0.0.0.0 0.0.0.0 x.y.z.k

with an IP next-hop if you have the following:

ip route 0.0.0.0.0 0.0.0.0 <interface-name>

your router is relying on Proxy ARP on ISP router and the end result can be a too big ARP table as it needs to ARP for every destination instead of making a single ARP request for x.y.z.k

Other possible issues at physical layer can be seen in the log messages

Hope to help

Giuseppe

[marce1000]

 - Use a syslog server for all involved cisco equipment to capture log (logging) at a central point, then review activities on  the syslogs during and before the troubled-times.

 M.

[Leo Laohoo]

---

@InformationSystems wrote:

Every morning our work center has to come in and unplug the line which feeds our internet connection to our Cisco 9300 switch from our router in order to get our internet connection/entire network back up and communicating. Any reason why this is happening?

---

Are there any more information other than this?  What troubleshooting was done?

[InformationSystems]

So we currently don't have logging set up on the router so no logs are retrievable. I did find out that I am unable to change the time on my router. What I found was that at 6:33am CST that my PC was unable to communicate with the switch. I do also know that many machines on my vlan are configured to go to sleep and so perhaps they are losing their vlan connection. 

[InformationSystems · Accepted solution]

So the issue turned out that the modem we received from our ISP was in bridge mode and wasn't connected directly to our router which was causing signal loss/noise in our cables and issues with our channels. The drops happened so frequently together that the connection would drop.