[j-nsp] EX4300 DHCP-Relay issues

[Lee Starnes]

Thanks everyone for your input. The reason we wanted dhcp relay even on the
irb that the dhcp server resides is that the extended information is passed
such as port, switch and other aspects for doing some auto provision
devices. We ended up just writing the dhcp server code to exclude the
non-relay packets when processing.

Best,

-Lee


On Sun, Jan 19, 2025 at 1:06 PM Igor Shtanko <garysh at ukr.net> wrote:

> Hi Lee,
>
> Hope this link will help you.
>
>
> https://supportportal.juniper.net/s/article/How-to-configure-DHCP-relay-for-EX-QFX-switches-running-Junos-ELS?language=en_US
>
>
> BR,
> Gary
> *10 січня 2025, 23:40:40, Від "Lee Starnes via juniper-nsp"
> <juniper-nsp at puck.nether.net <juniper-nsp at puck.nether.net>>:*
>
> Hello everyone,
>
> We ran into an issue while setting up a DHCP server that will be used for
> multiple vlans on several EX4300 switches. I am not sure if the issue we
> are seeing is because the server happens to reside on the same vlan as some
> of the test host machines, but what we are getting at the DHCP server side
> is the DHCP-Relay agent packets and also DHCP broadcast packets.
>
> We have setup what I thought was DHCP snooping to prevent the broadcast
> traffic, but still seeing it. Does anyone have a working example of a DHCP
> relay setup on these switches that they can share?
>
> Our setup is that each of the ports is an access port except between
> switches which is trunked with a native vlan set for those. Each host
> should DHCP their address and the switch relay it to the server. That is
> happening, but also the DHCP broadcast packets are also being sent to the
> server so we see two requests for each host.
>
>     <mgmt switch core> ---------------
>       /                        \                        \
> <mgmt-sw01>     <mgmt-sw02>    <mgmt-sw03>
> |           \                      |     \                     \
> dhcp     hosts1-30       hosts1-30           hosts1-30
> svr             VL29                 VL29&30              VL30&31
> VL29
>
> Any help would be greatly appreciated.
>
> Best,
>
> -Lee
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