Cisco 7246VXR - uBR Router Software Configuration Manual page 56

Supported Software Features for the Cisco uBR7200 Series
Syntax Description dhcp
leasetimer value
leasequery-filter
upstream query-num
interval
leasequery-filter
downstream
query-num interval
Defaults Disabled. When the dhcp option is specified, the leasetimer option is set by default to 60 minutes.
Command Modes
Global configuration, Cable interface configuration or subinterface configuration
Command History Release
11.3 XA
12.0(7)T
12.0(10)SC, 12.1(2)EC Support was added for these trains.
12.1(3a)EC
12.1(13)EC,
12.2(11)BC1
12.2(15)BC1
Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide
1-38
(Optional) Specifies that queries will be sent to verify unknown source IP
addresses in upstream data packets.
Note
(Optional) Specifies the time, in minutes, for how often the router should
check its internal CPE database for IP addresses whose lease times have
expired. The valid range for value is 1 to 240 minutes, with a default of
60 minutes.
Note
(Optional) Enables upstream lease queries to be defined on a per-SID basis
to reduce the chance of Denial of Service attacks.
•
•
(Optional) Enables downstream lease queries to be defined on a per-SID
basis to reduce the chance of Denial of Service attacks.
•
•
Configuring the cable source-verify command on the master interface of a bundle will
Note
configure it for all of the slave interfaces in the bundle as well.
Modification
This command was introduced.
The dhcp keyword was added.
Subinterface support was added.
The leasetimer keyword was added.
The verification of CPE devices was changed when using the dhcp keyword.
Do not enable the local DHCP server on the Cisco CMTS and
configure local DHCP address pools, using the ip dhcp pool
command, when using this option, because this prevents DHCP
address validation.
The leasetimer option takes effect only when the dhcp option is
also used on an interface. Also, this option is supported only on the
master interface and cannot be configured on subinterfaces.
Configuring it for a master interface automatically applies it to all
subinterfaces.
query-num— Number of leased queries per SID.
interval—Size of timer window in seconds.
query-num— Number of leased queries for an unknown SID.
interval—Size of timer window in seconds.
Chapter 1 Overview of Cisco uBR7200 Series Software
OL-2239-05