Service Manual

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
Dell(conf)# ipv6 icmp source-interface tengigabitethernet 1/1
Dell(conf)#
ip max-frag-count
Set the maximum number of fragments allowed in one packet for packet re-assembly.
Syntax
ip max-frag-count count
To place no limit on the number of fragments allowed, use the no ip max-frag-count command.
Parameters
count Enter a number for the number of fragments allowed for re-assembly. The range is
from 2 to 256.
Defaults No limit is set on number of fragments allowed.
Command Modes CONFIGURATION
Command
History
This guide is platform-specific. For command information about other platforms, see the relevant Dell
Networking OS Command Line Reference Guide.
Version Description
9.8(1.0) Introduced on the Z9100–ON.
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.
9.2(1.0) Introduced on the Z9500.
9.0.2.0 Introduced on the S6000.
8.3.19.0 Introduced on the S4820T.
8.3.11.1 Introduced on the Z9000.
8.3.7.0 Introduced on the S4810.
8.1.1.0 Introduced on the E-Series.
7.6.1.0 Introduced on the S-Series.
7.5.1.0 Introduced on the C-Series.
pre-6.1.1.0 Introduced for the E-Series.
Usage
Information
To avoid denial of service (DOS) attacks, keep the number of fragments allowed for re-assembly low.
712 IPv4 Routing