Clients randomly losing connection to Cisco SG-500-28

[ghansham]

Hi guys.

Recently I start having an issue with my Cisco SG-500-28 Switch.

Issue: Clients randomly loses connection, you can’t login into the web interface or ssh. All led lights shows activity and appear as it’s working normally.

The switch is in L3 mode with dhcp with multiple vlans.
Model: Cisco SG-500-28

The issue resolve after once or twice power cycle.

Any ideas would be helpful. 

[Flavio Miranda]

Hi

 I´d like to see the CPU during the problem. Sounds to me like CPU spike.  But, I´d upgrade it before anything.

[ghansham]

Thanks for your response.

I see this in the flash memory,

2147472979	2020-Apr-08 09:48:14	Emergency	%ERHG-F-SEND: NETP_ip_set_3swNextHop_type 1: NextHop_type = -2134176992 for NFFT entry is invalid.  ***** FATAL ERROR *****  Reporting Task: FFTT. Softwa re Version: 1.4.11.5 (date  08-Apr-2020 time  13:46:26) 0x16bd2c 0x16c290 0x167e50 0x801fd8 0x55ecc0 0x55f5b8 0x55f7d4 0x57e318 0x57e4d0 0x888354 * **** END OF FATAL ERROR *****   
2147474238	2020-Apr-12 16:20:31	Emergency	%ERHG-F-SEND: NETP_ip_set_3swNextHop_type 1: NextHop_type = 13306656 for NFFT entry is invalid.  ***** FATAL ERROR *****  Reporting Task: FFTT. Software  Version: 1.4.11.5 (date  08-Apr-2020 time  13:46:26) 0x16bd2c 0x16c290 0x167e50 0x801fd8 0x55ecc0 0x55f5b8 0x55f7d4 0x57e318 0x57e4d0 0x888354 **** * END OF FATAL ERROR *****   
2147474397	2015-Mar-29 09:29:04	Error	%SAS-E-SASIFNOTEXISTS: Interface vlan 1 does not exist or has no IP address., aggregated (5)      
	

[Flavio Miranda]

did you check this?

Interface vlan 1 does not exist or has no IP address., aggregated (5)      

[ghansham]

Would that be an issue? 

[mimladen]

Yes, it can be a problem.
Try to set static IP address for VLAN 1.

[ghansham]

Ok, I set a static ip, I'll monitor the switch to see if the issue continues. 

[marce1000]

 - Configure and or use a syslog server on the device , follow up on message reported on the syslog server, look for  networking trouble or other.

 M.

[ghansham]

I did setup a syslog server on my laptop using Kiwi Syslog. This issue re-occur, but I guess my configs didn’t capture it. I set the reporting to “debug” from the switch and just add the IP address to kiwi. 

[Martin Aleksandrov]

ghansham,

First, before troubleshooting the SMB/CBS switches, ensure you're running the latest software release. 

Few pinpoints here.

The suggestions from other participants here are relevant, setting up the Syslog Server and looking into the CPU Spikes are amongst the first things you have to observe. You will need also to explain a bit more about the topology i.e. how many and what type of end devices are connected, what other switches and what interconnections are between, use of LAG, STP, etc. Are affected devices from VLAN1?

Once making those clear we could advise on what would be the next steps.

Thanks