IP Router Configuration
Router Configuration Guide 167
The host-ones keyword following the broadcast parameter specifies that the broadcast
address used by the IP interface for this IP address will be the subnet broadcast address. This
is an IP address that corresponds to the local subnet described by the ip-addr and the mask-
length or mask with all the host bits set to binary 1. This is the default broadcast address used
by an IP interface.
The broadcast parameter within the address command does not have a negate feature, which
is usually used to revert a parameter to the default value. To change the broadcast type to
host-ones after being changed to all-ones, the address command must be executed with the
broadcast parameter defined.
The broadcast format on an IP interface can be specified when the IP address is assigned or
changed.
This parameter does not affect the type of broadcasts that can be received by the IP interface.
A host sending either the local broadcast (all-ones) or the valid subnet broadcast address
(host-ones) will be received by the IP interface.
Default host-ones
Values all-ones, host-ones
track-srrp — Specifies the SRRP instance ID that this interface route needs to track.
allow-directed-broadcasts
Syntax [no] allow-directed-broadcasts
Context config>router>interface
Description This command enables the forwarding of directed broadcasts out of the IP interface.
A directed broadcast is a packet received on a local router interface destined for the subnet broadcast
address of another IP interface. The allow-directed-broadcasts command on an IP interface enables
or disables the transmission of packets destined to the subnet broadcast address of the egress IP
interface.
When enabled, a frame destined to the local subnet on this IP interface is sent as a subnet broadcast out
this interface.
By default, directed broadcasts are not allowed and are discarded at this egress IP interface.
The no form of the command disables directed broadcasts forwarding out of the IP interface.
Default no allow-directed-broadcasts — Directed broadcasts are dropped.
Note: Allowing directed broadcasts is a well-known mechanism used for denial-of-service
attacks.
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