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FTOS Configuration Guide for the C-Series - Force10 Networks

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In Figure 221, Packet 1 has <strong>the</strong> destination IP address 1.1.1.255, which matches <strong>the</strong> subnet broadcast<br />

address of VLAN 101. If UDP helper is configured and <strong>the</strong> packet matches <strong>the</strong> specified UDP port, <strong>the</strong>n<br />

<strong>the</strong> system changes <strong>the</strong> address to <strong>the</strong> configured IP broadcast address and floods <strong>the</strong> packet on VLAN<br />

101.<br />

Packet 2 is sent from host on VLAN 101. It has a broadcast MAC address and a destination IP address of<br />

1.1.1.255. In this case, it is flooded on VLAN 101 in its original condition as <strong>the</strong> <strong>for</strong>warding process is<br />

Layer 2.<br />

Figure 221 UDP helper with Subnet Broadcast Addresses<br />

Preamble Start Frame<br />

Delimiter<br />

Destination MAC Source MAC<br />

(01:80:C2:00:00:0E)<br />

TLV 1<br />

Chassis ID<br />

TLV 2<br />

Port ID<br />

E<strong>the</strong>rnet Type<br />

(0x88CC)<br />

TLV 3<br />

Port Description<br />

TLV 4<br />

System Name<br />

LLDPDU Padding FCS<br />

TLV 5<br />

TLV 6<br />

TLV 7<br />

System Description System Capabilities Management Addr<br />

TLV 127<br />

Organizationally Specific<br />

UDP Helper with Configured Broadcast Addresses<br />

Incoming packets with a destination IP address matching <strong>the</strong> configured broadcast address of any interface<br />

are <strong>for</strong>warded to <strong>the</strong> matching interfaces.<br />

In Figure 222, Packet 1 has a destination IP address that matches <strong>the</strong> configured broadcast address of<br />

VLAN 100 and 101. If UDP helper is enabled and <strong>the</strong> UDP port number matches, <strong>the</strong> packet is flooded on<br />

both VLANs with an unchanged destination address.<br />

<strong>FTOS</strong> <strong>Configuration</strong> <strong>Guide</strong>, version 7.7.1.0 329<br />

TLV 0<br />

End of LLDPDU<br />

fnC0047mp

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