Managing the broadcast interface

About this task

Manage the broadcast interface by specifying and displaying which router interfaces can receive UDP broadcasts to forward.

In the navigation tree, expand the following folders: Configuration > IP.
Click UDP Forwarding.
Click the Broadcast Interfaces tab.
Click Insert.
In the LocalIfAddr field, click the ellipsis (...) to select a local interface IP address from the list, and then click OK.
In the UdpPortFwdListId field, click the ellipsis (...) to select a forwarding list ID from the list, and then click OK.
In the MaxTtl field, type the maximum number of hops an IP broadcast can take from the source device to the destination device (the default is 4; the range is 1 to 16).
In the BroadCastMask field, enter the subnet mask of the local interface that broadcasts the UDP broadcast packets.

When you configure the UDP forwarding broadcast mask, the broadcast mask must be less specific (shorter in length) or equally specific (equal in length) to the subnet mask of the IP interface on which it is configured. If the UDP forwarding broadcast mask is more specific than the subnet mask of the corresponding IP interface, UDP forwarding does not function properly.
Click Insert.

Use the data in the following table to use the Broadcast Interfaces tab.


Name	Description
LocalIfAddr	Specifies the IP address of the local router interface that receives forwarded UDP broadcast packets.
UdpPortFwdListId	Specifies the number of the UDP lists or profiles that this interface is configured to forward (0 to100). A value of 0 indicates that the interface cannot forward any UDP broadcast packets.
MaxTtl	Specifies the maximum number of hops an IP broadcast packet can take from the source device to the destination device (the default is 4; the range is 1 to 16).
NumRxPkts	Specifies the total number of UDP broadcast packets received by this local interface.
NumFwdPkts	Specifies the total number of UDP broadcast packets forwarded by this local interface.
NumDropPktsMaxTtlExpired	Specifies the total number of UDP broadcast packets dropped because the time-to-live (TTL) value expired.
NumDropPktsDestUnreach	Specifies the total number of UDP broadcast packets dropped because the destination was unreachable.
NumDropPktsUnknownPort	Specifies the total number of UDP broadcast packets dropped because the destination port or protocol specified has no matching forwarding policy.
BroadCastMask	Specifies the subnet mask of the local interface that broadcasts the UDP broadcast packets.