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Dell PowerEdge FN I/O Module Command Line Reference Guide 9.10(0.0)

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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 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 configured.

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 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 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 difficult 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 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

Dell(conf)#ipv6 icmp source-interface tengigabitethernet 0/1
                                             Dell(conf)#