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DHCP no requests coming from L2 -> L3 switches

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  • 1.  DHCP no requests coming from L2 -> L3 switches

    Posted Jun 15, 2022 01:44 PM

    First, sorry if i posted this on the wrong section,

    my last post was several years ago when it's still in HP forum.

    I am trying to resimplify my question.. the previous one is a headache :)

    L3-SW vlan interface (72)  : 192.168.72.253 ( JE006A )

    management vlan1 : 192.168.10.253
    dhcp server vlan interface (1) : 192.168.10.252.

    i can see relay dhcp requests coming from various vlan, only when the dhcp server directly attached to it.

    ( in this case, a dhcp vm server inside a host which directly connected with ethernet to one of L3 ports ).

    packet capture on dhcp server shows that bootp requests coming from 192.168.72.253 ( vlan 72 ),
    and the dhcp server will reply via to L3 switch.. then the dhcp clients got their ip addresses.

    IP 192.168.72.253.bootps > 192.168.10.252.bootps: BOOTP/DHCP, Request from <clientmacaddr>

    But then this same dhcp server (vm) , when moved to another host, behind one Layer 2 switch ( J9979 )

    the packet capture on dhcp server i got is just this :
    IP 0.0.0.0.bootpc > 255.255.255.255.bootps: BOOTP/DHCP, Request from <clientmacaddress>.
    and the client never got any ip served from dhcp. The L3 switch dhcp relay doesn't seem to work on this layout.

    Am i missing something ?

    I have checked many times that all trunk port are correctly assigned with vlan72, with untagged vlan1.



  • 2.  RE: DHCP no requests coming from L2 -> L3 switches

    Posted Jun 23, 2022 06:58 AM
    bumping with the hope that my question will makes more sense now  :)


  • 3.  RE: DHCP no requests coming from L2 -> L3 switches

    Posted Sep 16, 2022 06:26 AM
    Can you show your DHCP config and interface configs betweeen the switches?