http://www.utdallas.edu/~ravip/cs6390/fall01/dhcp.figure.pdf

On Thu, Sep 18, 2014 at 7:01 AM, Chris Jones <[email protected]> wrote:
> My DHCP clients are all stuck in SELECTING state. Has anyone ever seen that, 
> or maybe know what causes it?
>
> root@DVT-EX9200> show dhcp relay binding
>
> IP address        Session Id  Hardware address   Expires     State      
> Interface
> 0.0.0.0           18          00:25:90:3d:76:34  0           SELECTING  irb.30
> 0.0.0.0           19          00:25:90:3d:e5:13  0           SELECTING  irb.30
> 0.0.0.0           17          00:25:90:6d:f0:c3  0           SELECTING  irb.30
> 0.0.0.0           23          d4:be:d9:95:b6:4f  0           SELECTING  irb.16
>
>
>
>
>> On Sep 16, 2014, at 3:13 PM, William McLendon <[email protected]> wrote:
>>
>> this is a working DHCP config on EX9200s — make sure you include the 
>> forward-snooped-clients all-interfaces statement, or any transit DHCP packet 
>> that traverses an interface without DHCP relay configured will be eaten by 
>> the EX9200 — its the most asinine thing in the world to have (a carryover 
>> from MX some sort of DHCP security i’m sure), but its completely 
>> undocumented it does this from what i’ve seen.
>>
>>    dhcp-relay {
>>        forward-snooped-clients all-interfaces;
>>        server-group {
>>            CAMPUS {
>>                192.168.168.168;
>>            }
>>        }
>>        active-server-group CAMPUS;
>>        route-suppression {
>>            destination;
>>        }
>>        group LOCAL-NETS {
>>            interface ge-5/0/0.304;
>>            interface irb.9;
>>        }
>>    }
>> }
>>
>>
>> the route-suppression destination statement also prevents it from installing 
>> access-internal host routes and permanent ARP entries for every DHCP lease.
>>
>>
>> will
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>
> Chris Jones, JNCIE-ENT #272 / JNCIP-SP
> SDN Engineer
> www.sdnessentials.com
> Cell: 858-888-0373
> E-Mail: [email protected]
>
>
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