Ipv6 icmp source-interface

Defaults

Command Modes

Command History

Usage Information

Example

• For a Loopback interface, enter the keyword loopback then a number from 0 to 16383.

• For a port channel interface, enter the keywords port-

	channel then a number.
	• For a VLAN interface, enter the keyword vlan then a
	number from 1 to 4094.
Not configured.
CONFIGURATION
Version	Description
9.7(0.0)	Introduced on the S6000-ON.
9.3(0.0)	Introduced on the S4810, S4820T, S6000, and Z9000
	platforms.

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.

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

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