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no-snoop (DHCP Local Server and Relay Agent)

Syntax

Hierarchy Level

Description

Disable DHCP snooping filters.

DHCP snooping provides DHCP security by identifying incoming DHCP packets. In the default DHCP snooping configuration, all traffic is snooped. You can optionally use the forward-snooped-clients statement to evaluate the snooped traffic and to determine if the traffic is forwarded or dropped, based on whether or not the interface is configured as part of a group.

In both the default configuration and in configurations using the forward-snooped-clients statement, all DHCP traffic is forwarded from the hardware control plane to the routing plane of the routing instance to ensure that all DHCP packets are intercepted. In certain topologies, such as a Metropolitan Routing Ring topology, forwarding all DHCP traffic to the control plane can result in excessive traffic. The no-snoop configuration statement disables the snooping filter for DHCP traffic that can be directly forwarded on the hardware control plane, such as Layer 3 unicast packets with a valid route, causing those DHCP packets to bypass the slower routing plane.

Required Privilege Level

system—To view this statement in the configuration.

system-control—To add this statement to the configuration.

Release Information

Statement introduced in Junos OS Release 15.1R2.