412CHAPTER 16: INTERNET PROTOCOL (IP)

ip interface directedBroadcast

3500

9000

9400

3900

9300

For CoreBuilder 9000: Applies to Layer 3 switching modules only.

Specifies whether the forwarding of a directed broadcast (all 1s in the host portion of the address) is enabled or disabled for a specified interface. A directed broadcast is a packet that is sent to a specific network or series of networks.

Valid Minimum Abbreviation

ip i di

Important Considerations

You define the directed broadcast state on a per-interface basis.

When the state is enabled and the system determines that the destination is different from the interface that is receiving the directed broadcast, the system uses the broadcast address that is defined for this interface to forward the directed broadcast.

You can disable the forwarding of a directed broadcast if security is an issue.

By default, the directed broadcast state is enabled.

Options

Prompt

Description

Possible Values

[Default]

 

 

 

 

 

IP interfaces

Index numbers of the interfaces

One or more

Current

 

to which you want to enable or

 

selectable

value

 

disable the forwarding of a

 

interface

 

 

directed broadcast.

 

indexes

 

 

(Not applicable if you have more

all

 

 

than one interface)

? (for a list of

 

 

 

 

 

 

 

selectable

 

 

 

 

interface

 

 

 

 

indexes)

 

Directed

Whether you want to implement

enabled

Current

broadcast state

direct broadcast on an interface.

disabled

value

 

The system prompts you for a

 

 

 

 

 

state for each interface.

IP Interface Directed Broadcast Example (3500)

Select menu option (ip/interface): directedBroadcast

Select IP interfaces (1,2all?):2

Interface 2 - Enter directed broadcast state

(disabled, enabled) [enabled]:

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3Com 3500 manual IP Interface Directed Broadcast Example