Enabling direct broadcasting
The Direct Broadcast tab allows you to enable or disable directed broadcast traffic forwarding on an IP-interface basis.
To enable IP-directed broadcast suppression for a VLAN:
- From the Device Manager menu bar, choose VLAN > VLANs.
| The VLAN dialog box opens with the Basic tab displayed. |
- From the table, select a VLAN.
- Click IP.
| The IP, VLAN dialog box opens with the IP Address tab displayed. |
- Click the Direct Broadcast tab.
| The Direct Broadcast tab opens. |
- Do one of the following:
- De-select DirectBroadcastEnable check box to suppress the IP-directed broadcasts.
- Select the DirectBroadcastEnable check box to opt not to suppress the IP-directed broadcasts.
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Note:
Multiple VLANs/IRPs in the same subnet but in different switches must be configured simultaneously.
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The table below describes the item in the Direct Broadcast tab..
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DirectBroadcastEnable
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If enabled, an Isolated Routing Port (IRP) can forward directed broadcast traffic. A directed broadcast is a frame sent to the subnet broadcast address on a remote IP subnet. By disabling or suppressing directed broadcast on an interface, all frames sent to the subnet broadcast address for a local router interface are dropped. Disabling this function protects a host from possible denial of service (DOS) attacks.
Note: This feature is enabled by default. With the feature enabled, the CPU does not receive a copy of the directed broadcast. As a result, the switch does not respond to a subnet broadcast ping sent from a remote subnet.
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