Udp Helper With Subnet Broadcast Addresses; Udp Helper With Configured Broadcast Addresses - Dell S6100 Configuration Manual

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Figure 53. UDP Helper with Broadcast-All Addresses

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 the following illustration, Packet 1 has the destination IP address 1.1.1.255, which matches the subnet broadcast address of VLAN 101. If

you configured UDP helper and the packet matches the specified UDP port, the system changes the address to the configured IP

broadcast address and floods the packet on VLAN 101.

Packet 2 is sent from the 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 54. UDP Helper with Subnet Broadcast Addresses

Incoming packets with a destination IP address matching the configured broadcast address of any interface are forwarded to the matching

In the following illustration, Packet 1 has a destination IP address that matches the configured broadcast address of VLAN 100 and 101. If

you enabled UDP helper 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 you enabled UDP helper, the packet is flooded on VLAN 100 as well.

IPv4 Routing