Dell Force10 E1200i FTOS Version 8.4.1.5 Configuration Guide for ExaScale - Page 472
UDP Helper with Subnet Broadcast Addresses,
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www.dell.com | support.dell.com UDP Helper with Subnet Broadcast Addresses When the destination IP address of an incoming packet matches the subnet broadcast address of any interface, the system changes the address to the configured broadcast address and sends it to matching interface. In Figure 24-4, Packet 1 has the destination IP address 1.1.1.255, which matches the subnet broadcast address of VLAN 101. If UDP helper is configured and the packet matches the specified UDP port, then the system changes the address to the configured IP broadcast address and floods the packet on VLAN 101. Packet 2 is sent from host on VLAN 101. It has a broadcast MAC address and a destination IP address of 1.1.1.255. In this case, it is flooded on VLAN 101 in its original condition as the forwarding process is Layer 2. Figure 24-4. UDP helper with Subnet Broadcast Addresses Preamble Start Frame Destination MAC Source MAC Delimiter (01:80:C2:00:00:0E) Ethernet Type (0x88CC) LLDPDU Padding FCS TLV 1 Chassis ID TLV 2 Port ID TLV 3 Port Description TLV 4 TLV 5 TLV 6 TLV 7 TLV 127 TLV 0 System Name System Description System Capabilities Management Addr Organizationally Specific End of LLDPDU UDP Helper with Configured Broadcast Addresses Incoming packets with a destination IP address matching the configured broadcast address of any interface are forwarded to the matching interfaces. In Figure 24-5, Packet 1 has a destination IP address that matches the configured broadcast address of VLAN 100 and 101. If UDP helper is enabled and the UDP port number matches, the packet is flooded on both VLANs with an unchanged destination address. Packet 2 is sent from a host on VLAN 101. It has broadcast MAC address and a destination IP address that matches the configured broadcast address on VLAN 101. In this case, Packet 2 is flooded on VLAN 101 with the destination address unchanged because the forwarding process is Layer 2. If UDP helper is enabled, the packet is flooded on VLAN 100 as well. 472 | IPv4 Addressing
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