Virtual Private Routed Network Services
7750 SR OS Services Guide Page 1245
all-ones — The all-ones keyword following the broadcast parameter specifies the broadcast address
used by the IP interface for this IP address will be 255.255.255.255, also known as the local
broadcast.
host-ones — 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-address and the mask-
length or mask with all the host bits set to binary one. 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.
allow-directed-broadcasts
Syntax [no] allow-directed-broadcasts
Context config>service>vprn>interface
Description This command controls 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 on 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 will be sent as a subnet
broadcast out this interface. Care should be exercised when allowing directed broadcasts as it is a
well-known mechanism used for denial-of-service attacks.
When disabled, directed broadcast packets discarded at this egress IP interface will be counted in the
normal discard counters for the egress SAP.
By default, directed broadcasts are not allowed and will be discarded at this egress IP interface.
The no form of this command disables the forwarding of directed broadcasts out of the IP interface.
Default no allow-directed-broadcasts — Directed broadcasts are dropped.
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