Allied Telesis x900-48 series - Manual (Page 31)

Page 31 | AlliedWare™ OS How To Note: DHCP snooping on AT-9900-style switches
Troubleshooting > The DHCP ACK is dropped by the switch
In this scenario we have the most basic QoS config possible to permit all IP traffic, but it has
not been applied to any port, so the solution is to set policy 1 to port 1:
Where n is the number of leases permitted on port 1.
Now our DHCP ACK is forwarded:
Manager > set qos port=1 policy=1
DHCPSN_ACL: dhcpSnoopAclBindingCreate >> templateId=1 flowId=1 port=1 num=1
DHCPSN_ACL: dhcpSnoopAclBindingCreate >> created child-1 bindings of templateId=1
DHCPSN_ACL: dhcpSnoopAclBindingCreate >> templateId=1 flowId=1 port=1 num=n
DHCPSN_ACL: dhcpSnoopAclBindingCreate >> created child-n bindings of templateId=1
DHCPSN_Process: [0b43ce2c] DHCP Snooping pkt for VLAN 1 from port 1
DHCPSN_Process: [0b43ce2c] Type: REQUEST
DHCPSN_Process: [0b43ce2c] On DHCP Snooping non-trusted port
DHCPSN_Process: [0b43ce2c] DHCP Snoop forwarding pkt at L2 for VLAN 1 InPort 1
DHCPSN_Process: [0b43ce2c] L2 Dest MAC is broadcast
DHCPSN_Process: [0b43ce2c] Type: REQUEST, L2 forward to trusted ports
DHCPSN_Process: [0b43ce2c] Forward ports (except 1)
DHCPSN_Process: [0b43ce2c] Tagged:None
DHCPSN_Process: [0b43ce2c] Untagged:48
DHCPSN_Process: [0b43d64c] DHCP Snooping pkt for VLAN 1 from port 48
DHCPSN_Process: [0b43d64c] Type: REPLY
DHCPSN_Process: [0b43d64c] On DHCP Snooping trusted port
DHCPSN_Process: [0b43d64c] Lookup result for CHAddr 00-06-5b-31-14-af: Port 1
DHCPSN_Process: [0b43d64c] DHCP ACK Found...
DHCPSN_DB: Updating entryId 2. Flags 00000010
DHCPSN_DB: Notifying DB listener: CLASSIFR
DHCPSN_ACL: dhcpSnoopAclListener >> dbEntryPt=0x195de05c flags=0x00000080
DHCPSN_ACL: dhcpSnoopAclBindingFindByEntryIndex >> finding binding entryId=2
DHCPSN_ACL: dhcpSnoopAclBindingFindGroup >> found 0 items
DHCPSN_ACL: dhcpSnoopAclBindingFindByEntryIndex >> finding binding entryId=2 items=0
DHCPSN_ACL: dhcpSnoopAclBindingFindFreeByPortNumber >> finding binding portNum=1
DHCPSN_ACL: dhcpSnoopAclBindingFindGroup >> found 1 items
DHCPSN_ACL: dhcpSnoopAclBindingFindFreeByPortNumber >> finding binding portNum=1 items=1
DHCPSN_ACL: dhcpSnoopAclBindingBinds >> bclassId=45521 portNum=1 entryId=2
DHCPSN_ACL: dhcpSnoopAclBindingBinds >> success, classifierId=45521 flowGroupId=1
portNum=1 entryId=2
DHCPSN_ACL: dhcpSnoopAclBindingDestroyFoundList >> destroying list with 0 items
DHCPSN_ACL: dhcpSnoopAclListener >> NEW, returns=1
DHCPSN_DB: Change state for 00-06-5b-31-14-af, in NOLEASE_NOLISTEN for event LISTENER_OK
DHCPSN_DB: Changed state for 00-06-5b-31-14-af, to FULL
DHCPSN_Process: [0b43d64c] DHCP Snoop forwarding pkt at L2 for VLAN 1 InPort 48
DHCPSN_Process: [0b43d64c] L2 Dest MAC is unicast
DHCPSN_Process: [0b43d64c] Using chaddr lookup result for dest port(s)
DHCPSN_Process: [0b43d64c] L2 forward packet directly to port 1
DHCPSN_Process: [0b43d64c] Forward ports (except 48)
DHCPSN_Process: [0b43d64c] Tagged:None
DHCPSN_Process: [0b43d64c] Untagged:1