Campus Switching and Routing

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HPE 3810 switch, DHCP takes time

I've enabled DHCP server function on HPE 3810, but it takes almost 80 seconds to get an IP address from the switch. So I wonder, is this normal behavior? If not, I'd like to know how long time it is supposed to be.

Re: HPE 3810 switch, DHCP takes time

No, that is not normal. DHCP should be sub-second. Do you have only one DHCP server in that network? It can be that DHCP servers detect other/competing servers and back-off in that case to avoid conflicts.

 

Also, you can try to add the 'authoritative' keyword to your pool.

dhcp-server pool "vlan41"
   default-router "10.1.41.1"
   dns-server "10.254.1.254"
   lease 00:00:30
   network 10.1.41.0 255.255.255.0
   range 10.1.41.100 10.1.41.199
   authoritative
   exit

And check if you enabled the dhcp server, as by default it is disabled:

dhcp-server enable

If that doesn't help, I would do a packet capture from the client and monitor the DHCP process; and from the switch use the show dhcp-server commands to see if there is something that gives you a clue:

Aruba2930F# show dhcp-server
 binding               Show DHCP server IP address binding information.
 conflicts             Show DHCP server address conflict information.
 database              Show DHCP server lease database information.
 pool                  Show DHCP server address pool information.
 server-details        show dhcp-server database file transfer server details.
 statistics            Show DHCP server statistics information.
 <cr>
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If you have urgent issues, please contact your Aruba partner or Aruba TAC (click for contact details).
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