VPRN Services
7705 SAR OS Services Guide Page 465
allow-directed-broadcasts
Syntax allow-directed-broadcasts
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 for the subnet broadcast address of the egress IP
interface.
When enabled, a frame destined for 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
arp-timeout
Syntax arp-timeout seconds
no arp-timeout
Context config>service>vprn>interface
Description This command configures the minimum time, in seconds, that an ARP entry learned on the IP
interface will be 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 arp-timeout is set to a value of 0 s, ARP aging is disabled.
The no form of this command restores arp-timeout to the default value.
Default 14400 s
Parameters seconds — the minimum number of seconds a learned ARP entry will be 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 to 65535
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