Alcatel-Lucent 7750 SR Manual page 1245

Os services guide

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all-ones — The all-ones keyword following the broadcast parameter specifies the broadcast address

host-ones — The host-ones keyword following the broadcast parameter specifies that the broadcast

allow-directed-broadcasts

[no] allow-directed-broadcasts

config>service>vprn>interface

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

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.

no allow-directed-broadcasts — Directed broadcasts are dropped.

7750 SR OS Services Guide

used by the IP interface for this IP address will be 255.255.255.255, also known as the local

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.

Virtual Private Routed Network Services