[c-nsp] Cisco 2960G not passing DHCP

[Majdi S. Abbas]

Config would be nice but if these devices are requesting DHCP on interface transition up it sounds a lot like STP blocking.

Do show us the interface configs -- but before that, check to see if portfast is on on the client port.

--msa

Verstuurd vanaf mijn iPhone

> On Oct 22, 2017, at 4:55 PM, Igor Sukhomlinov <dvalinswamp at gmail.com> wrote:
> 
> Can you show the 2960 config?
> Is there anything anything in the logs?
> 
> 
> On Mon, Oct 23, 2017 at 10:34 AM, Curtis Piehler <cpiehler2 at gmail.com>
> wrote:
> 
>> Including NSP
>> 
>>> On Oct 22, 2017 7:33 PM, "Curtis Piehler" <cpiehler2 at gmail.com> wrote:
>>> 
>>> No security features running and no DHCP snooping.  There are 3 Raritan
>>> PDUs and one Fortigate connected to the 2960G.  All of them exhibiting the
>>> same behavior.  No dhcp requests passing through and no MAC address on the
>>> port.  Moving the host devices to the 3560G was my next step.  I am not at
>>> the location so just trying to do as much as I can remotely before the on
>>> site visit.
>>> 
>>> On Oct 22, 2017 7:22 PM, "Igor Sukhomlinov" <dvalinswamp at gmail.com>
>>> wrote:
>>> 
>>>> HI Curtis,
>>>> 
>>>> Anything in the logs of the 2960?
>>>> Do you have any security features enabled,e.g. DAI, DHCP snooping? Faced
>>>> similar behavior several times due to configurations in the past.
>>>> Is that only that Raritan experiencing problems on the 2960? Have you
>>>> tried mowing the affected unit to the 3560?
>>>> 
>>>> Rgds,
>>>> Igor
>>>> 
>>>> On Mon, Oct 23, 2017 at 9:24 AM, Curtis Piehler <cpiehler2 at gmail.com>
>>>> wrote:
>>>> 
>>>>> I'm racking my brains out on this yet it seems so simple unless I am
>>>>> encountering a bug.
>>>>> 
>>>>> I have several host devices connected to the following switch,
>>>>> Firewalls/PDUs, etc...:
>>>>> Switch Ports Model              SW Version            SW Image
>>>>> 
>>>>> ------ ----- -----              ----------            ----------
>>>>> 
>>>>> *    1 48    WS-C2960G-48TC-L   12.2(55)SE10          C2960-LANBASEK9-M
>>>>> 
>>>>> This switch sits down stream from a 3560G which uplinks to a firewall
>>>>> (Router on a stick).  The problem I am encountering is that the devices
>>>>> connected downstream of the 2960G are not receiving DHCP from the 3560G
>>>>> switch or firewall.  Of course I have one DHCP at a time but to test
>>>>> different devices that can serve out DHCP.  What's odd is that I have
>>>>> the
>>>>> same exact model PDU connected to the 3560G and it obtains DHCP without
>>>>> issues.
>>>>> 
>>>>> The devices downstream of the 2960G do not yield any MAC address.  I
>>>>> have
>>>>> done all sorts of DHCP debugging and nothing comes up from the
>>>>> devices.  I
>>>>> even tried moving the DHCP server down to the 2960G and I see no
>>>>> activity.
>>>>> Statically assigning IPs to devices work no problem.
>>>>> 
>>>>> The PDUs are Raritan factory defaulted so when the port is shut/no shut
>>>>> they are designed to get DHCP.  The firewall is a Fortinet with the
>>>>> interface set to obtain DHCP.
>>>>> 
>>>>> Unfortunately I can not get a traffic sniffer on this switch but I'm
>>>>> wondering if anyone has had this issue before or heard of this.
>>>>> 
>>>>> Curtis
>>>>> _______________________________________________
>>>>> cisco-nsp mailing list  cisco-nsp at puck.nether.net
>>>>> https://puck.nether.net/mailman/listinfo/cisco-nsp
>>>>> archive at http://puck.nether.net/pipermail/cisco-nsp/
>>>>> 
>>>> 
>>>> 
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