Qtech QSW-8200-28T-POEAC- DC — dHCP Commands User Manual: Lease and Max Lease Time Settings [14/79]

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User Manual

Chapter 1. Commands for DHCP 14

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1.1.21 lease

 Command: lease { [<days>] [<hours>][<minutes>] | infinite }

 no lease

 Function: Sets the lease time for addresses in the address pool; the “no lease”

command restores the default setting.

 Parameters: <days> is number of days from 0 to 365; <hours> is number of hours from

0 to 23; <minutes> is number of minutes from 0 to 59; infinite means perpetual use.

 Default: The default lease duration is 1 day.

 Command Mode: DHCP Address Pool Mode

 Usage Guide: DHCP is the protocol to assign network addresses dynamically instead of

permanently, hence the introduction of ease duration. Lease settings should be decided

based on network conditions: too long lease duration offsets the flexibility of DHCP,

while too short duration results in increased network traffic and overhead. The default

lease duration of switch is 1 day.

 Example: Setting the lease of DHCP pool “1” to 3 days 12 hours and 30 minutes.

 Switch(dhcp-1-config)#lease 3 12 30

1.1.22 max-lease-time

 Command: max-lease-time {[<days>] [<hours>] [<minutes>] | infinite}

 no max-lease-time

 Function: Set the maximum lease time for the addresses in the address pool; the no

command restores the default setting.

 Parameters: <days> is number of days from 0 to 365; <hours> is number of hours from

0 to 23; <minutes> is number of minutes from 0 to 59; infinite means perpetual use.

 Default: The default lease time is 1 day.

 Command Mode: DHCP Address Pool Mode

 Usage Guide: This command is used to DHCP request packets with option51. If the

lease time (user requests the address) exceeds the maximum lease time configured, the

lease that DHCP server assigns the address is the maximum lease time configured. If the

lease time requested by the user is less than the maximum lease time configured, the

lease that DHCP server assigns the address is the lease time requested by the user. The

maximum lease time is able to be set by the administrator according to the actual

network condition, and the maximum lease time is 1 day by default.

 Example: Set the maximum lease time of DHCP address pool1 to 3 days 12 hours and

30 minutes.

 Switch(dhcp-1-config)#max-lease-time 3 12 30

1.1.23 netbios-name-server

 Command: netbios-name-server <address1>[<address2>[…<address8>]]

 no netbios-name-server