Dell Force10 MXL Blade MXL 10/40GbE Switch IO Module Configuration Guide - Page 274
UDP Helper, Configuring UDP Helper, Important Points to Remember, Enabling UDP Helper
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www.dell.com | support.dell.com To view if ICMP unreachable messages are sent on the interface, use the show config command in INTERFACE mode. If it is not listed in the show config command output, it is enabled. Only non-default information is displayed in the show config command output. UDP Helper 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. Configurations using this feature are described in Configurations Using UDP Helper. Configuring UDP Helper Configuring FTOS to direct UDP broadcast is a two-step process: 1. Enable UDP helper and specify the UDP ports for which traffic is forwarded (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 must 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 ip udp-helper udp-ports command (Figure 14-10). Figure 14-10. Enabling UDP Helper FTOS(conf-if-te-1/1)#ip udp-helper udp-port 1000 FTOS(conf-if-te-1/1)#show config ! interface TenGigabitEthernet 1/1 ip address 2.1.1.1/24 ip udp-helper udp-port 1000 no shutdown To view the interfaces and ports on which UDP helper is enabled, use the show ip udp-helper command from EXEC Privilege mode (Figure 14-11). 272 | IPv4 Routing
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