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FTOS Configuration Guide for the C-Series - Force10 Networks

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2. Configure a broadcast address on interfaces that will receive UDP broadcast traffic. See Configuring a<br />

Broadcast Address on page 327.<br />

Important Points to Remember about UDP Helper<br />

• The existing command ip directed broadcast is rendered meaningless if UDP helper is enabled on <strong>the</strong><br />

same interface.<br />

• The broadcast traffic rate should not exceed 200 packets per second when UDP helper is enabled.<br />

• You may specify a maximum of 16 UDP ports.<br />

• UDP helper is compatible with IP helper (ip helper-address):<br />

• UDP broadcast traffic with port number 67 or 68 are unicast to <strong>the</strong> DHCP server per <strong>the</strong> ip<br />

helper-address configuration whe<strong>the</strong>r or not <strong>the</strong> UDP port list contains those ports.<br />

• If <strong>the</strong> UDP port list contains ports 67 or 68, UDP broadcast traffic <strong>for</strong>warded on those ports.<br />

Enabling UDP Helper<br />

Enable UPD helper using <strong>the</strong> command ip udp-helper udp-ports, as shown in Figure 216.<br />

Figure 216 Enabling UDP Helper<br />

<strong>Force10</strong>(conf-if-gi-1/1)#ip udp-helper udp-port 1000<br />

<strong>Force10</strong>(conf-if-gi-1/1)#show config<br />

!<br />

interface GigabitE<strong>the</strong>rnet 1/1<br />

ip address 2.1.1.1/24<br />

ip udp-helper udp-port 1000<br />

no shutdown<br />

View <strong>the</strong> interfaces and ports on which UDP helper is enabled using <strong>the</strong> command show ip udp-helper<br />

from EXEC Privilege mode, as shown in Figure 217.<br />

Figure 217 Viewing <strong>the</strong> UDP Broadcast <strong>Configuration</strong><br />

<strong>Force10</strong>#show ip udp-helper<br />

--------------------------------------------------<br />

Port UDP port list<br />

--------------------------------------------------<br />

Gi 1/1 1000<br />

326 IP Addressing

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