problema con switch cisco sf350 24 ports

[jmpatagonia]

buen dia tengo un problema con un switch cisco sf350

Cisco SF350 24 Pports

Software Information
Firmware Version (Active Image): 2.5.8.12
Firmware Version (Non-active): 2.5.0.83

El problema es que en mi servidor dhcp a cada minuto el switch esta solicitando ip via dhcp. pero el switch tiene ip fija.

Apr 29 09:54:15 dnsmasq-dhcp[3925085]: 122070 client provides name: Swicht12-Vlan37-Tall-Desa
Apr 29 09:54:19 dnsmasq-dhcp[3925085]: 122070 DHCPDISCOVER(eth0.37) 04:5f:b9:a0:44:fb
Apr 29 09:54:19 dnsmasq-dhcp[3925085]: 122070 tags: vlan37, eth0.37
Apr 29 09:54:19 dnsmasq-dhcp[3925085]: 122070 DHCPOFFER(eth0.37) 10.11.37.118 04:5f:b9:a0:44:fb
Apr 29 09:54:19 dnsmasq-dhcp[3925085]: 122070 requested options: 1:netmask, 3:router, 66:tftp-server, 67:bootfile-name,
Apr 29 09:54:19 dnsmasq-dhcp[3925085]: 122070 requested options: 54:server-identifier, 125:vendor-id-encap,
Apr 29 09:54:19 dnsmasq-dhcp[3925085]: 122070 requested options: 129, 150:tftp-server-address, 131, 132, 6:dns-server,
Apr 29 09:54:19 dnsmasq-dhcp[3925085]: 122070 requested options: 15:domain-name, 100:posix-timezone, 43:vendor-encap
Apr 29 09:54:19 dnsmasq-dhcp[3925085]: 122070 next server: 10.11.37.15
Apr 29 09:54:19 dnsmasq-dhcp[3925085]: 122070 broadcast response
Apr 29 09:54:19 dnsmasq-dhcp[3925085]: 122070 sent size: 1 option: 53 message-type 2
Apr 29 09:54:19 dnsmasq-dhcp[3925085]: 122070 sent size: 4 option: 54 server-identifier 10.11.37.15
Apr 29 09:54:19 dnsmasq-dhcp[3925085]: 122070 sent size: 4 option: 51 lease-time 6h
Apr 29 09:54:19 dnsmasq-dhcp[3925085]: 122070 sent size: 4 option: 58 T1 3h
Apr 29 09:54:19 dnsmasq-dhcp[3925085]: 122070 sent size: 4 option: 59 T2 5h15m
Apr 29 09:54:19 dnsmasq-dhcp[3925085]: 122070 sent size: 4 option: 28 broadcast 10.11.37.255
Apr 29 09:54:19 dnsmasq-dhcp[3925085]: 122070 sent size: 23 option: 15 domain-name policia.rionegro.gov.ar
Apr 29 09:54:19 dnsmasq-dhcp[3925085]: 122070 sent size: 4 option: 1 netmask 255.255.255.0
Apr 29 09:54:19 dnsmasq-dhcp[3925085]: 122070 sent size: 4 option: 6 dns-server 10.11.37.15
Apr 29 09:54:19 dnsmasq-dhcp[3925085]: 122070 sent size: 4 option: 3 router 10.11.37.4
Apr 29 09:54:27 dnsmasq-dhcp[3925085]: 122070 available DHCP range: 10.11.37.100 -- 10.11.37.200
Apr 29 09:54:27 dnsmasq-dhcp[3925085]: 122070 vendor class: CiscoPnP

Saludos.

PD: ya desactive el ciscopnp

[balaji.bandi · Accepted solution]

is the switch acting as DHCP ? of not try below

config t

!

no ip dhcp server

no ip dhcp relay enable

!

end

Still issue please  post show run

[jmpatagonia]

I detect that the dhcp server on message log say

Apr 29 11:04:15 dnsmasq-dhcp[3930030]: 122070 DHCPOFFER(eth0.37) 10.11.37.118 04:5f:b9:a0:44:fb

That --> 04:5f:b9:a0:44:fb is the maccdres of the switch but that 10.11.37.118 is not the ip of the switch !!!!

It is possible that the switch have another IP some where ??

Regards.

[jmpatagonia]

this message is frequently on the switch log

2147478926 2021-Aug-20 03:33:01 Warning %BOOTP_DHCP_CL-W-DHCPSUBNETEXIST: The device has rejected a duplicated subnet configuration on interface Vlan 1, IP 10.11.37.118, mask 255.255.255.0, DHCP server 10.11.37.15   
2147478927 2021-Aug-20 03:31:49 Warning %BOOTP_DHCP_CL-W-DHCPSUBNETEXIST: The device has rejected a duplicated subnet configuration on interface Vlan 1, IP 10.11.37.118, mask 255.255.255.0, DHCP server 10.11.37.15   
2147478928 2021-Aug-20 03:30:37 Warning %BOOTP_DHCP_CL-W-DHCPSUBNETEXIST: The device has rejected a duplicated subnet configuration on interface Vlan 1, IP 10.11.37.118, mask 255.255.255.0, DHCP server 10.11.37.15   
2147478929 2021-Aug-20 03:29:25 Warning %BOOTP_DHCP_CL-W-DHCPSUBNETEXIST: The device has rejected a duplicated subnet configuration on interface Vlan 1, IP 10.11.37.118, mask 255.255.255.0, DHCP server 10.11.37.15 

[jmpatagonia]

2147478926 2021-Aug-20 03:33:01 Warning %BOOTP_DHCP_CL-W-DHCPSUBNETEXIST: The device has rejected a duplicated subnet configuration on interface Vlan 1, IP 10.11.37.118, mask 255.255.255.0, DHCP server 10.11.37.15   
2147478927 2021-Aug-20 03:31:49 Warning %BOOTP_DHCP_CL-W-DHCPSUBNETEXIST: The device has rejected a duplicated subnet configuration on interface Vlan 1, IP 10.11.37.118, mask 255.255.255.0, DHCP server 10.11.37.15   
2147478928 2021-Aug-20 03:30:37 Warning %BOOTP_DHCP_CL-W-DHCPSUBNETEXIST: The device has rejected a duplicated subnet configuration on interface Vlan 1, IP 10.11.37.118, mask 255.255.255.0, DHCP server 10.11.37.15   
2147478929 2021-Aug-20 03:29:25 Warning %BOOTP_DHCP_CL-W-DHCPSUBNETEXIST: The device has rejected a duplicated subnet configuration on interface Vlan 1, IP 10.11.37.118, mask 255.255.255.0, DHCP server 10.11.37.15 

[balaji.bandi]

post show run as requested before

[jmpatagonia]

I believe found the problem

IP Address I/F I/F Status Type Directed Prec Redirect Status
admin/oper Broadcast
------------------ --------- ---------- ------- --------- ---- -------- ------
0.0.0.0/32 vlan 1 UP/UP DHCP disable No enable Not
receiv
ed

how con I disable DHCP on vlan 1 ?

[balaji.bandi]

post show run as requested before

show run interface vlan 1 - check what config there.

[jmpatagonia]

Swichtxx-...#show run interface vlan 1
Empty configuration

[jmpatagonia]

I have a lot of this message on console

Swichtxxx...#20-Aug-2021 23:53:13 %BOOTP_DHCP_CL-W-DHCPSUBNETEXIST: The device has rejected a duplicated subnet configuration on interface Vlan 1, IP xx.xx.xx.111, mask 255.255.255.0, DHCP server xx.xx.xx.xx

[jmpatagonia]

finally the solution was delete the ipv4 for vlan1, we dont use for the moment.

[balaji.bandi]

sure i was in impression you are running everything on VLAN 1, yes cisco suggest not use VLAN 1 default for security reason, yes

interfaface vlan1

shutdown