Allied Telesis AT-8700XL Series, Rapier i Series Troubleshooting, trusted ports, UntaggedNone

Troubleshooting

You cannot work around dropped ARPs from the DHCP server by statically binding the DHCP server’s IP and MAC address to a port, instead of setting it as trusted. The switch will not send the DHCP server the DHCP request. The switch will not flood the DHCP request to any ports other than trusted ones. So although the switch will let the DHCP server send ARP requests, the DHCP server will not receive any DHCP requests.

Manager > add dhcpsnooping binding=00-50-FC-EE-F5-13 ip=172.16.1.1 int=vlan1 port=24 DHCPSN_DB: Creating new entry with entryId 3.

DHCPSN_DB: Notifying DB listener: CLASSIFR

DHCPSN_ACL: dhcpSnoopAclListener >> dbEntryPt=0x010caed4 flags=0x00000080

DHCPSN_ACL: dhcpSnoopAclBindingFindByEntryIndex >> finding binding entryId=3

DHCPSN_ACL: dhcpSnoopAclBindingFindGroup >> found 0 items

DHCPSN_ACL: dhcpSnoopAclBindingFindByEntryIndex >> finding binding entryId=3 it0

DHCPSN_ACL: dhcpSnoopAclBindingFindAllByPortNumber >> finding binding portNum=24

DHCPSN_ACL: dhcpSnoopAclBindingFindGroup >> found 0 items

DHCPSN_ACL: dhcpSnoopAclBindingFindAllByPortNumber >> finding binding portNum=20

DHCPSN_ACL: dhcpSnoopAclBindingCreate >> templateId=10001 flowId=0 port=24 num=3

DHCPSN_ACL: dhcpSnoopAclBindingCreate >> created child-3 bindings of templateId1

DHCPSN_ACL: dhcpSnoopAclBindingBinds >> bclassId=20003 portNum=24 entryId=3

DHCPSN_ACL: dhcpSnoopAclBindingBinds >> success, classifierId=20003 flowGroupId3

DHCPSN_ACL: dhcpSnoopAclListener >> NEW, returns=1

DHCPSN_DB: Change state for 00-50-fc-ee-f5-13, in NONE for event LISTENER_OK

DHCPSN_DB: Changed state for 00-50-fc-ee-f5-13, to FULL

Info (1137003): Operation successful.

Manager >

DHCPSN_ARP: [02680e6c] ARP Received on untrusted port 24 VLAN 1

DHCPSN_ARP: [02680e6c] ARP to be forwarded, sender validated

DHCPSN_ARP: [02680e6c] Forwarding ARP at L2 for VLAN 1

DHCPSN_ARP: [02680e6c] Forward ports (except 24)

DHCPSN_ARP: [02680e6c] Tagged:None

DHCPSN_ARP: [02680e6c] Untagged:1

Manager >
DHCPSN_Process: [026ef9ac] DHCP Snooping pkt for VLAN 1		from port 1
DHCPSN_Process: [026ef9ac] Type: REQUEST
DHCPSN_Process: [026ef9ac] On DHCP Snooping non-trusted		port
DHCPSN_Process: [026ef9ac] DHCP Snoop forwarding pkt at		L2 for VLAN 1 InPort 1
DHCPSN_Process: [026ef9ac] L2 Dest MAC is broadcast
DHCPSN_Process: [026ef9ac] Type: REQUEST, L2 forward to		trusted ports
DHCPSN_Process: [026ef9ac] Forward ports (except 1)
DHCPSN_Process: [026ef9ac]	Tagged:None
DHCPSN_Process: [026ef9ac]	Untagged:None

Page 23 AlliedWare™ OS How To Note: DHCP Snooping on Rapier-style switches