Re: DHCP Snooping Issue

Whats connected to g2/18?

Can you show the output of "*show ip dhcp snooping binding (all*)".

I suspect you have a device that is connected to the port. The device has is
probably not configured for dhcp. This means the device is trying to arp.
Since the switch does not know this device in its snoop binding table, its
denying the ARP frames.

If my guess is right, you need to configure the device to do DHCP or
configure the port as a trust port for both DHCP and ARP to solve the
problem.

HTH
Sadiq

On Sun, Jun 12, 2011 at 4:01 PM, <roykhan123_at_hotmail.com> wrote:

> Dear All,
>
> I am facing problem in my network is that i am getting DHCP snooping Deny
> log
> messages continue in my switches. I knows that how dhcp snooping is working
> but
> i do not knows why this is appearing in the switch, when there is no dhcp
> server connected that ports and every thing is working fine.
>
> %SW_DAI-4-DHCP_SNOOPING_DENY: 1 Invalid ARPs (Req) on Gi2/18, vlan
> 20.([0022.5ac1.202a/10.1.1.1/0000.0000.0000/10.0.176.16/17:38:05 AST Sun
> Jun 12
> 2011])
>
> 1. Is this because of Virus. that cause the machine to generate this error.
> I
> saw this problem before there was a virus.
> 2. I dont knows about the servers may be some services is running inside
> the
> server that cause the server to generate this request Or some thing else
>
> Note some there is no virus on the machine and still this error is occur on
> the
> machine... I really do not Why this happening and how i fix this issue.
>
> Currently I am getting this message and there is no issue with the Machine
> it
> self
>
> Port configuration
>
> interface GigabitEthernet2/9
>
> switchport
> switchport access vlan 19
> switchport mode access
> switchport voice vlan 16
> ip arp inspection limit rate 128
> no ip address
> spanning-tree portfast
> spanning-tree bpduguard enable
> end
> !
> ip dhcp snooping
> ip dhcp snooping vlan 19,16
> !
>
> kindly advise
>
> Take care
>
>
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