Troubleshooting
Increasing the port’s maximum leases will permit multiple clients per port.
Manager > set dhcpsnooping port=3 maxleases=2
Info (1137260): DHCP Snooping port(s) 3 updated successfully.
Switch is dropping ARPs
If you have DHCP snooping in ARP security mode, then unknown clients on untrusted ports will not be able to ARP.
DHCPSN_ARP: [0193a9ec] ARP Received on untrusted port 24 VLAN 1
DHCPSN_ARP: [0193a9ec] ARP Discarded, sender not found in DHCP Snoop DB
Known clients on untrusted ports will be able to ARP.
DHCPSN_ARP: [01a6f5ec] ARP Received on untrusted port 1 VLAN 1
DHCPSN_ARP: [01a6f5ec] ARP to be forwarded, sender validated
DHCPSN_ARP: [01a6f5ec] Forwarding ARP at L2 for VLAN 1
DHCPSN_ARP: [01a6f5ec] Forward ports (except 1)
DHCPSN_ARP: [01a6f5ec] Tagged:None
DHCPSN_ARP: [01a6f5ec] Untagged:24
A client is known on an untrusted port if it has an IP/MAC entry in the DHCP snooping database (show dhcpsnooping database). Your DHCP server must be on a trusted port.
Manager > set dhcpsnooping port=24 trusted=yes
Info (1137260): DHCP Snooping port(s) 24 updated successfully.
Manager >
DHCPSN_ARP: [023a218c] ARP Received on trusted port 24 VLAN 1
DHCPSN_ARP: [023a218c] Forwarding ARP at L2 for VLAN 1
DHCPSN_ARP: [023a218c] Forward ports (except 24)
DHCPSN_ARP: | [023a218c] | Tagged:None |
DHCPSN_ARP: | [023a218c] | Untagged:1 |
Page 22 AlliedWare™ OS How To Note: DHCP Snooping on
