DELL S50V User Manual
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IPv4 Addressing
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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.
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.
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 21-15. UDP helper with Subnet Broadcast Addresses
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.
are forwarded to the matching interfaces.
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.
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.
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.
Figure 21-16. UDP Helper with Configured Broadcast Addresses
TLV 1
Chassis ID
Chassis ID
Preamble
Start Frame
Delimiter
Delimiter
Destination MAC
(01:80:C2:00:00:0E)
(01:80:C2:00:00:0E)
Source MAC
Ethernet Type
(0x88CC)
(0x88CC)
LLDPDU
Padding
FCS
TLV 2
Port ID
Port ID
TLV 3
Port Description
Port Description
TLV 4
System Name
System Name
TLV 5
System Description
System Description
TLV 6
System Capabilities
System Capabilities
TLV 7
Management Addr
Management Addr
TLV 0
End of LLDPDU
End of LLDPDU
TLV 127
Organizationally Specific
Organizationally Specific
Packet 1
Destination Address:
Destination Address:
1.1.255.255
1/1
Ingress interface
IP Address: 2.1.1.1/24
UDP helper enabled
IP Address: 2.1.1.1/24
UDP helper enabled
1/2
1/3
VLAN 100
IP address: 1.1.0.1/24
Subnet broadcast address: 1.1.0.255
Configured broadcast address:
IP address: 1.1.0.1/24
Subnet broadcast address: 1.1.0.255
Configured broadcast address:
1.1.255.255
Hosts on VLAN 100: 1.1.0.2, 1.1.0.3, 1.1.0.4
VLAN 101
IP address: 1.11.1/24
Subnet broadcast address: 1.1.1.255
Configured broadcast address:
IP address: 1.11.1/24
Subnet broadcast address: 1.1.1.255
Configured broadcast address:
1.1.255.255
Hosts on VLAN 100: 1.1.1.2, 1.1.1.3, 1.1.1.4
fnC0048mp
Packet 2
Switched Packet
Destination Address:
1.1.255.255
Switched Packet
Destination Address:
1.1.255.255