Alcatel 9000 Betriebsanweisung PDF herunterladen (Seite 357)

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Configuring DHCP Relay Configuring DHCP Security Features

OmniSwitch 6800/6850/9000 Network Configuration Guide June 2006 page 18-21

-> no ip helper dhcp-snooping binding 00:2a:95:51:6c:10 port 1/15 address

17.15.3.10 lease-time 3 vlan 200

To view the DHCP Snooping binding table contents, use the show ip helper dhcp-snooping binding

command. See the OmniSwitch CLI Reference Guide for example outputs of this command.

Configuring the Binding Table Timeout

The contents of the DHCP Snooping binding table resides in the switch memory. In order to preserve table

entries across switch reboots, the table contents is automatically saved to the dhcpBinding.db file located

in the /flash/switch directory.

The amount of time, in seconds, between each automatic save is referred to as the binding table timeout

value. By default, the timeout value is 300 seconds. To configure this value, use the ip helper dhcp-

snooping binding timeout command. For example, the following command sets the timeout value to

1500 seconds:

-> ip helper dhcp-snooping binding timeout 1500

Each time an automatic save is performed, the dhcpBinding.db file is time stamped.

Synchronizing the Binding Table

To synchronize the contents of the dhcpBinding.db file with the binding table contents that resides in

memory, use the ip helper dhcp-snooping binding action command. This command provides two

parameters: purge and renew. Use the purge parameter to clear binding table entries in memory and the

renew parameter to populate the binding table with the contents of the dhcpBinding.db file. For example:

-> ip helper dhcp-snooping binding action purge

-> ip helper dhcp-snooping binding action renew

Synchronizing the binding table is only done when this command is used. There is no automatic trigger-

ing of this function. In addition, it is important to note that synchronizing the binding table loads dhcp-

Binding.db file contents into memory. This is the reverse of saving the binding table contents in memory

to the dhcpBinding.db file, which is done at automatic time intervals as defined by the binding table

timeout value. See “Configuring the Binding Table Timeout” on page 18-20 for more information.

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