Concept Guide

Example
Dell(conf)#ip icmp source-interface tengigabitethernet 0/1
Dell(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 congure 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 congured), the source IP
address of the outgoing ICMP error message is modied, although the
packets are not sent out using the congured interface. Because the
management interface is congurable 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 Loopback interface, enter the keyword loopback. The range is from 0 to
16383.
• For a Port Channel interface, enter the keywords port-channel then a number.
The range is from 1 to 128.
• For a 10-Gigabit Ethernet interface, enter the keyword TenGigabitEthernet.
• For a VLAN interface, enter the keyword vlan. The range is from 1 to 4094.
Defaults Not congured.
Command Modes CONFIGURATION
Supported Modes Full–Switch
Command History
Version Description
9.9(0.0) Introduced on the FN IOM.
9.3(0.0) Introduced on the MXL platform.
Usage Information You can enable the mechanism to congure 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 congured for equal-cost multipath (ECMP) links, you cannot eectively and optimally use the
traceroute and ping applications to examine the network reachability 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 dicult to employ the ping and
traceroute utilities. 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
618 IPv4 Routing