Defaults Not configured.CommandModesCONFIGURATIONCommandHistory Version 9.3(0.0) Introduced on the S4810, S4820T, S6000, and Z9000platforms.UsageInformationYou can enable the mechanism to configure the source or the originating interfacefrom which the packet (the device that generates the ICMP error messages) isreceived by the switch to send the loopback address instead of its source IPaddress to be used in the ICMP unreachable messages and in the traceroutecommand output. The loopback address must be unique in a particular domain.In network environments that contain a large number of devices, ranging up tothousands of systems, and with each device configured for equal-cost multipath(ECMP) links, you cannot effectively and optimally use the traceroute and pingapplications to examine the network reachablity and identify any broken links fordiagnostic purposes. In such cases, if the reply that is obtained from each hop onthe network path contains the IP address of the adjacent, neighboring interfacefrom which the packet is received, it is difficult to employ the ping and tracerouteutilites. You can enable the ICMP unreachable messages to contain the loopbackaddress of the source device instead of the previous hop's IP address to be able toeasily and quickly identify the device and devices along the path because the DNSserver maps the loopback IP address to the hostname and does not translate the IPaddress of every interface of the switch to the hostname.Example Dell(conf)#ip icmp source-interface tengigabitethernet 0/0Dell(conf)#ipv6 icmp source-interfaceEnable the ICMP error and unreachable messages to be sent with the source interface IP address, such asthe loopback address, instead of the hops of the preceding devices along the network path to be used foreasy debugging and diagnosis of network disconnections and reachability problems with IPv6 packets.This functionality is supported on the S4810, , , and platforms.Syntax ipv6 icmp source-interface interfaceParameters interface Enter one of the following keywords and slot/port or numberinformation:• For a Management Ethernet interface, enter the keywordmanagementethernet.IPv4 Routing 857
