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cable source-verify leasequery-filter upstream
The cable source-verify leasequery-filter upstream command enables DHCP lease query filtering on
Note
all upstreams on a cable interface, but the actual filtering does not begin until the cable source-verify
dhcp command and the no cable arp command are configured on the upstream's associated downstream
interface. You can configure these commands on either the downstream's main interface, or on a
subinterface for the downstream. If these commands are configured on a subinterface, however, the lease
query filtering occurs only for cable modems using that subinterface.
Note
If using cable interface bundling, configure the cable source-verify leasequery-filter upstream
command on all master and slave interfaces.
Use the
Tip
requests in the downstream direction.
Examples
The following example shows how to configure the Cisco CMTS router so that it allows a maximum of
five DHCP lease query requests per SID over each two-second interval on all upstreams on a particular
cable interface. This example also shows the configuration of cable source-verify dhcp and no cable
arp commands on the cable interface, which are required to use this feature.
Router# configure terminal
Router(config)# interface cable 6/0
Router(config-if)# cable source-verify dhcp
Router(config-if)# cable source-verify leasequery-filter upstream 5 2
Router(config-if)# no cable arp
Router(config-if)#
Related Commands
Command
cable arp
cable arp filter
cable source-verify
cable source-verify
leasequery-filter
downstream
show cable
leasequery-filter
Cisco Broadband Cable Command Reference Guide
2-230
cable source-verify leasequery-filter downstream
Description
Activates the cable Address Resolution Protocol (ARP).
Controls the number of ARP requests and replies that can be forwarded over
a cable interface.
Enables verification of IP addresses for cable modems (CMs) and CPE
devices on the upstream.
Controls the number of DHCP lease query messages that are sent for
unknown IP addresses on all cable downstream interfaces on the
Cisco CMTS router.
Displays the number of DHCP lease query messages that have been filtered
for all cable modems or for a particular cable interface.
Chapter 2
Cisco CMTS Configuration Commands
command to filter DHCP LEASEQUERY
OL-1581-08
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