Dell PowerConnect B-RX Configuration Manual page 271

To disable the directed broadcasts, enter the following command in the CONFIG mode.
BigIron RX(config)# no ip directed-broadcast
To enable directed broadcasts on an individual interface instead of globally for all interfaces, enter
commands such as the following.
BigIron RX(config)# interface ethernet 1/1
BigIron RX(config-if-e10000-1/1)# ip directed-broadcast
Syntax: [no] ip directed-broadcast
Disabling forwarding of IP source-routed packets
A source-routed packet specifies the exact router path for the packet. The packet specifies the path
by listing the IP addresses of the router interfaces through which the packet must pass on its way to
the destination. The device supports both types of IP source routing:
•
•
The device forwards both types of source-routed packets by default. You cannot enable or disable
strict or loose source routing separately.
To disable forwarding of IP source-routed packets, enter the following command.
BigIron RX(config)# no ip source-route
Syntax: [no] ip source-route
To re-enable forwarding of source-routed packets, enter the following command.
BigIron RX(config)# ip source-route
Enabling support for zero-based IP subnet broadcasts
By default, the device treats IP packets with all ones in the host portion of the address as IP
broadcast packets. For example, the device treats IP packets with 209.157.22.255/24 as the
destination IP address as IP broadcast packets and forwards the packets to all IP hosts within the
209.157.22.x subnet (except the host that sent the broadcast packet to the device).
Most IP hosts are configured to receive IP subnet broadcast packets with all ones in the host
portion of the address. However, some older IP hosts instead expect IP subnet broadcast packets
that have all zeros instead of all ones in the host portion of the address. To accommodate this type
of host, you can enable the device to treat IP packets with all zeros in the host portion of the
destination IP address as broadcast packets.
BigIron RX Series Configuration Guide
53-1002253-01
Strict source routing – requires the packet to pass through only the listed routers. If the device
receives a strict source-routed packet but cannot reach the next hop interface specified by the
packet, the device discards the packet and sends an ICMP Source-Route-Failure message to
the sender.
NOTE
The device allows you to disable sending of the Source-Route-Failure messages. Refer to
"Disabling ICMP messages"
Loose source routing – requires that the packet pass through all of the listed routers but also
allows the packet to travel through other routers, which are not listed in the packet.
Configuring forwarding parameters
on page 196.
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