Switch SG300 Block (DHCP work, but no acces to internet)

[mydi88]

I have switch (SG300 28SFP-K9) everything work but it block soudenly everytime (DHCP work, but users cant connect to internet)

1. When i reload the switch and i clear arp and ip dhcp binding everything work well

2. When it doesnt fonction in the endpoint user (i check DHCP it works, i ping 8.8.8.8 it doesnt work, i ping the switch access it works, i ping the backbone switch it works, i ping firewall it doesnt work)

 NB : I have more than 300 users and the switch make its self DHCP (Every switch access make its DHCP)

[Flavio Miranda]

If you ping the backbone switch and it works, presuming this switch is your core, I dont know if the problem is in the access switch.  You mentioned a firewall, where does this firewall is placed? between the core (backbone switch) and internet?

If you run a trace route command while the problem is happening, where the packet stops?

 I know that by reloading the switch the problem goes away call the attention to the switch but maybe we have anything else there.

[mydi88]

Thanks Flavio for your response and your attention.

The architecture is right that :

ISP --> FIREWALL (Works as Router : NAT) --> SWITCH BACKBONE (Switch core : VLANs and switch access in interfaces) --> Switchs Access (ALL switchs works right except this one i mean SG300)

I´ll do traceroute tomorrow for you.

[balaji.bandi]

1. When i reload the switch and i clear arp and ip dhcp binding everything work well

Check any new firmware available for SG300 and upgrade and test it.

NB : I have more than 300 users and the switch make its self DHCP (Every switch access make its DHCP)

SG300 is a switch, and designed for small-sized businesses, 

what is the CPU load of the switch? how about ARP table information, what % interface consumed connects to uplink?

Do you see any abnormal logs before you reload

[paul driver]

Hello

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@mydi88 wrote:

I have switch (SG300 28SFP-K9) everything work but it block soudenly everytime (DHCP work, but users cant connect to  NB : I have more than 300 users and the switch make its self DHCP (Every switch access make its DHCP)

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So Just to confirm only users on this switch are effected correct or do you have this switch connected in such a way all 300 users lose connectivity?