478 | IPv4 Addressingw w w . d e l l . c o m | s u p p o r t . d e l l . c o mConfiguring a Broadcast AddressConfigure a broadcast address on an interface using the command ip udp-broadcast-address, as shown inFigure 21-12.Figure 21-12. Configuring a Broadcast AddressView the configured broadcast address for an interface using the command show interfaces, as shown inFigure 21-13.Figure 21-13. Configuring a Broadcast AddressConfigurations Using UDP HelperWhen UDP helper is enabled and the destination IP address of an incoming packet is a broadcast address,FTOS suppresses the destination address of the packet. The following sections describe variousconfigurations that employ UDP helper to direct broadcasts.• UDP Helper with Broadcast-all Addresses on page 479• UDP Helper with Subnet Broadcast Addresses on page 479• UDP Helper with Configured Broadcast Addresses on page 480• UDP Helper with No Configured Broadcast Addresses on page 481FTOS(conf-if-vl-100)#ip udp-broadcast-address 1.1.255.255FTOS(conf-if-vl-100)#show config!interface Vlan 100ip address 1.1.0.1/24ip udp-broadcast-address 1.1.255.255untagged GigabitEthernet 1/2no shutdownR1_E600(conf)#do show interfaces vlan 100Vlan 100 is up, line protocol is downAddress is 00:01:e8:0d:b9:7a, Current address is 00:01:e8:0d:b9:7aInterface index is 1107787876Internet address is 1.1.0.1/24IP UDP-Broadcast address is 1.1.255.255MTU 1554 bytes, IP MTU 1500 bytesLineSpeed autoARP type: ARPA, ARP Timeout 04:00:00Last clearing of "show interface" counters 00:07:44Queueing strategy: fifoInput Statistics:0 packets, 0 bytesTime since last interface status change: 00:07:44
