Dell S6000 FTOS 9.0(2.0) Configuration Guide for the System - Page 435

The default backoff interval remains at 20 seconds. On the S4810 platform, with FTOS version 8.3.8.0 and later, the time between ARP resend is configurable. This timer is an exponential backoff timer. Over the specified period, the time between ARP requests increases. This reduces the potential for the system to slow down while waiting for a multitude of ARP responses. Task Set the number of ARP retries. Set the an exponential timer for resending unresolved ARPs. Display all ARP entries learned via gratuitous ARP. Command Syntax arp retries number Default: 5 Range: 1-20 arp backoff-time Default: 30 Range: 1 to 3600 show arp retries Command Mode CONFIGURATION CONFIGURATION EXEC Privilege ICMP For diagnostics, Internet Control Message Protocol (ICMP) provide routing information to end stations by choosing the best route (ICMP redirect messages) or determining if a router is reachable (ICMP Echo or Echo Reply). ICMP Error messages inform the router of problems in a particular packet. These messages are sent only on unicast traffic Configuration Task List for ICMP Use the following steps to configure ICMP: • Enable ICMP unreachable messages • UDP Helper Enable ICMP unreachable messages By default, ICMP unreachable messages are disabled. When enabled ICMP unreachable messages are created and sent out all interfaces. To disable ICMP unreachable messages, use the no ip unreachable command. To reenable the creation of ICMP unreachable messages on the interface, use the following command in the INTERFACE mode: Command Syntax ip unreachable Command Mode Purpose INTERFACE Set FTOS to create and send ICMP unreachable messages on the interface. IPv4 Routing | 413