SG350 28P - DHCP server not handing out IP... rebooting doesn't work

[alchu425]

i All, 

We have several incidents that the DHCP server on SG350 28P stop leasing IP to clients without reason. 

I logged on to the SG350... DHCP Binding shows all clients IP are EXPIRED. MAC table still has all the mac addresses. ARP table still has 4 addresses out of 30 some devices.

rebooted the SG350... no change. DHCP Binding still shows all IPs EXPRIRED. ARP only shows my computer(which is statically assigned).  

I had to factory default the switch and reconfigure... then DHCP server start leasing out the IPs.

I tried firmware 2.2, 2.4 and 2.5. All have the same symptoms. 

Please help. 

Thank you 

Alfred  

[Georg Pauwen]

Hello,

post screenshots of the IP Configuration > IPv4 Interface and the DHCP Server > Properties, Address Pools, Address Binding, and DHCP Options screens...

[alchu425]

I put some screen shots on to the word file. 

i just rebooted the sg350 and everything in dhcp binding are all expired. 

I rebooted those devices too... still the same. those devices are poe tho. 

[alchu425]

have you encountered things like that?

the dhcp server stopped leasing out IPs. dhcp binding shows all IPs are expired after the switch came up from power outage or a reboot (soft or hard)

I tried to use all firmware from 2.3 to 2.5... all have the same problem. 

[alchu425]

current config:

switchf1e878#show run
config-file-header
switchf1e878
v2.3.5.63 / RLINUX_923_093
CLI v1.0
file SSD indicator encrypted
@
ssd-control-start
ssd config
ssd file passphrase control unrestricted
no ssd file integrity control
ssd-control-end cb0a3fdb1f3a1af4e4430033719968c0
!
!
unit-type-control-start
unit-type unit 1 network gi uplink none
unit-type-control-end
!
voice vlan oui-table add 0001e3 Siemens_AG_phone________
voice vlan oui-table add 00036b Cisco_phone_____________
voice vlan oui-table add 00096e Avaya___________________
voice vlan oui-table add 000fe2 H3C_Aolynk______________
voice vlan oui-table add 0060b9 Philips_and_NEC_AG_phone
voice vlan oui-table add 00d01e Pingtel_phone___________
voice vlan oui-table add 00e075 Polycom/Veritel_phone___
voice vlan oui-table add 00e0bb 3Com_phone______________
ip dhcp server
ip dhcp pool network prim
address low 192.168.1.10 high 192.168.1.250 255.255.255.0
lease 0 0 3
exit
bonjour interface range vlan 1
hostname switchf1e878
no passwords complexity enable
username cisco password encrypted 7af78c911d5b48bea1dc2449d9d89513abeb4be5 privilege 15
ip ssh server
snmp-server server
ip telnet server
!
interface vlan 1
no ip address dhcp
!
exit
switchf1e878#

[Boris Bolles]

Hello Alfred,

although this is a rather old thread, since I've got basically the same problem right now (see https://community.cisco.com/t5/switching/dhcp-server-failing-after-every-reboot-of-switch-sg350-10p/m-p/4728780/highlight/true#M534094), I would like to ask kindly if you ever found a solution?

Thanks,

Boris

[alchu425]

nope... need to wipe out the config every time it reboots or loses power... then reconfigure...