Service Manual

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 1-Gigabit Ethernet interface, enter the keyword GigabitEthernet
then the slot/port information.
• For a 10-Gigabit Ethernet interface, enter the keyword
TenGigabitEthernet then the slot/port information.
• 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.
Defaults Not congured.
Command Modes CONFIGURATION
Command History
Version Description
9.8(0.0) Introduced on the S3048-ON and S4048-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 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 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 dicult 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
Dell(conf)#ipv6 icmp source-interface gigabitethernet 1/1
Dell(conf)#
710
IPv4 Routing