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forwards the packet to SW2 and sends an ICMP redirect message to Host H. Host H learns of the new route using the ICMP

redirect message and sends all future packets to the remote branch office host to SW2.

To enable ICMP or ICMP6 redirect messages, use the icmp6-redirect enable command.

NOTE: The icmp6-redirect enable command is applicable for both ICMP and ICMP6 redirects.

By default, Dell EMC Networking OS supports redirects on VLAN interfaces. For physical ports and port channel interfaces,

carve the fedgovacl CAM region.

UDP Helper

User datagram protocol (UDP) helper allows you to direct the forwarding IP/UDP broadcast traffic by creating special

broadcast addresses and rewriting the destination IP address of packets to match those addresses.

Configure UDP Helper

To configure Dell EMC Networking OS to direct UDP broadcast, enable UDP helper and specify the UDP ports for which traffic

is forwarded. See Enabling UDP Helper

Important Points to Remember

● The existing ip directed broadcast command is rendered meaningless if you enable UDP helper on the same

interface.

● The broadcast traffic rate should not exceed 200 packets per second when you enable UDP helper.

● You may specify a maximum of 16 UDP ports.

● UDP helper is compatible with IP helper (ip helper-address):

○ UDP broadcast traffic with port number 67 or 68 are unicast to the dynamic host configuration protocol (DHCP) server

per the ip helper-address configuration whether or not the UDP port list contains those ports.

○ If the UDP port list contains ports 67 or 68, UDP broadcast traffic is forwarded on those ports.

Enabling UDP Helper

To enable UDP helper, use the following command.

● Enable UPD helper.

ip udp-helper udp-ports

DellEMC(conf-if-tf-1/1)#ip udp-helper udp-port 1000

DellEMC(conf-if-tf-1/1)#show config

interface twentyFiveGigE 1/1

ip address 2.1.1.1/24

ip udp-helper udp-port 1000

no shutdown