CLI Guide

Version Description
9.12(1.0) Introduced on the S5048F–ON.
9.10(0.1) Introduced on the S6010-ON and S4048T-ON.
9.10(0.0) Introduced on the S3148.
9.10(0.0) Introduced on the S6100–ON.
9.8(2.0) Introduced on the S3100 series.
9.8(0.0P5) Introduced on the S4048-ON.
9.8(0.0P2) Introduced on the S3048-ON.
9.7(0.0) Introduced on the S6000-ON.
9.3(0.0) Introduced on the S4810, S4820T, S6000, and Z9000 platforms.
Usage
Information
You can enable the mechanism to configure the source or the originating interface from which the packet
(the device that generates the ICMP error messages) is received by the switch to send the loopback
address instead of its source IP address to be used in the ICMP unreachable messages and in the
traceroute command output. The loopback address must be unique in a particular domain.
In network environments that contain a large number of devices, ranging up to thousands of systems, and
with each device configured for equal-cost multipath (ECMP) links, you cannot effectively and optimally
use the traceroute and ping applications to examine the network reachablity and identify any broken links
for diagnostic purposes. In such cases, if the reply that is obtained from each hop on the network path
contains the IP address of the adjacent, neighboring interface from which the packet is received, it is
difficult to employ the ping and traceroute utilites. You can enable the ICMP unreachable messages to
contain the loopback address of the source device instead of the previous hop's IP address to be able
to easily and quickly identify the device and devices along the path because the DNS server maps the
loopback IP address to the hostname and does not translate the IP address of every interface of the
switch to the hostname.
Example
DellEMC(conf)# ip icmp source-interface twentyFiveGigE 1/1
DellEMC(conf)#
ipv6 icmp source-interface
Enable the ICMP error and unreachable messages to be sent with the source interface IP address, such as the loopback
address, instead of the hops of the preceding devices along the network path to be used for easy debugging and diagnosis of
network disconnections and reachability problems with IPv6 packets.
Syntax
ipv6 icmp source-interface interface
Parameters
interface Enter one of the following keywords and slot/port or number information:
● For a Management Ethernet interface, enter the keyword
managementethernet.
NOTE: When you configure the capability to enable the loopback IP
address to be sent for easy debugging and diagnosis (IP addresses of the
devices for which the ICMP source interface is configured), the source
IP address of the outgoing ICMP error message is modified, although
the packets are not sent out using the configured interface. Because the
management interface is configurable only without any parameters such as
the IP address, it is treated to the management interface of the primary
unit or the existing unit.
● For a 10-Gigabit Ethernet interface, enter the keyword
TenGigabitEthernet then the slot/port/subport information.
● For a 25-Gigabit Ethernet interface, enter the keyword twentyFiveGigE
then the slot/port[/subport] information.
762 IPv4 Routing