Alcatel-Lucent 7450 ESS Series, Configuration Manual

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IP Router Configuration
7450 ESS OS Router Configuration Guide Page 125
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.
NOTE : Allowing directed broadcasts is a well-known mechanism used for denial-
of-service attacks.
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.
arp-timeout
Syntax arp-timeout seconds
no arp-timeout
Context config>router>interface
Description
This command configures the minimum time, in seconds, an ARP entry learned on the IP interface is
stored in the ARP table. ARP entries are automatically refreshed when an ARP request or gratuitous
ARP is seen from an IP host. Otherwise, the ARP entry is aged from the ARP table. If the
arp-
timeout value is set to 0 seconds, ARP aging is disabled.
The no form of the command reverts to the default value.
Default
14400 seconds (4 hours)
Parameters seconds — The minimum number of seconds a learned ARP entry is stored in the ARP table,
expressed as a decimal integer. A value of 0 specifies that the timer is inoperative and learned
ARP entries will not be aged.
Values 0 — 65535
bfd
Syntax bfd transmit-interval [ receive receive-interval ] [ multiplier multiplier ] [ echo-receive echo-
interval ]
no bfd
Context config>router>interface
config>router>interface>ipv6
Description This command specifies the bi-directional forwarding detection (BFD) parameters for the associated
IP interface. If no parameters are defined the default values are used.
The multiplier specifies the number of consecutive BFD messages that must be missed from the peer
before the BFD session state is changed to down and the upper level protocols (OSPF, IS-IS, BGP or
PIM) is notified of the fault.
The no form of the command removes BFD from the router interface regardless of the IGP/RSVP.
Default no bfd