Allied Telesis Rapier 16Fi-FX Installationsanleitung PDF herunterladen (Seite 263)

MAC-Forced Forwarding 5

Using the DHCP Snooping Database

MAC-Forced Forwarding gathers the AR, AS and client details from the DHCP

snooping database. DHCP snooping adds entries to this database when:

■ a client uses DHCP to obtain an IP address - DHCP snooping checks the

DHCP ACK packets sent between the client and its DHCP server

■ you configure the entry manually through a DHCP snooping binding entry

To enable DHCP snooping on the EAN, use the command:

enable dhcpsnooping

You must configure any uplink ports to ARs as trusted ports before DHCP

snooping can successfully operate. To add a trusted port, use the command:

set dhcpsnooping port={port-list|all} trusted=yes

[other-options]

DHCP snooping plays an integral role in MAC-Forced Forwarding operation.

For details about configuring DHCP snooping, see the DHCP Snooping chapter

in your Software Reference.

Manually adding

entries

You can create static entries for clients, ARs and ASs. This allows you to use

MAC-Forced Forwarding for clients on the subnet that do not use DHCP for IP

address assignment. This also allows you to define any ASs available on the

network, as DHCP snooping does not create dynamic entries for ASs.

To add a static client entry, use the command:

add dhcpsnooping binding[=macaddr] interface=vlan ip=ipadd

port=port-number router=[ipadd,ipadd...]

To add a static AR or AS entry, use the command:

add macff server interface=vlan ipaddress={ipadd}

[description=desc]

Viewing the entries To view the list of clients in the DHCP snooping database, use the command:

show dhcpsnooping database

To display the list of ARs and ASs in the database, use the command:

show macff database

Enabling MAC-Forced Forwarding

To enable the EAN to proxy ARP on behalf of ARs and ASs on a VLAN, use the

command:

enable macff interface=vlan

To disable MAC-Forced Forwarding on a VLAN, use the command:

disable macff interface=vlan

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Allied Telesis Rapier 16Fi-FX Installationsanleitung Seite 263