Setting The Mtu Packet Size - Cisco ASR 1000 Series Configuration Manual

Configuring IP Services
Command or Action
Step 5
exit
Example:
Router# exit
Step 6 show ip icmp rate-limit [interface-type
interface-number]
Example:
Router# show ip icmp rate-limit
ethernet 2/3
Example
The following output using theshow ip icmp rate-limit command displays the unreachable destinations by
interface:
Router# show ip icmp rate-limit
Interval (millisecond)
Interface
---------
Ethernet0/0
Ethernet0/2
Serial3/0/3
The greatest number of unreachables is on serial interface 3/0/3.

Setting the MTU Packet Size

All interfaces have a default MTU packet size. You can adjust the IP MTU size so that the software will
fragment any IP packet that exceeds the MTU set for an interface.
Changing the MTU value (with the mtu interface configuration command) can affect the IP MTU value. If
the current IP MTU value is the same as the MTU value and you change the MTU value, the IP MTU value
will be modified automatically to match the new MTU. However, the reverse is not true; changing the IP
MTU value has no effect on the value for the mtu interface configuration command.
All devices on a physical medium must have the same protocol MTU in order to operate.
Perform this task to set the MTU packet size for a specified interface.
Purpose
• interval-ms--(Optional) Time limit for an interval for which a
logging message is triggered. The default is 60000, which is 1
minute.
Counting begins as soon as this command is configured.
Note
Exits to privileged EXEC mode.
(Optional) Displays all current ICMP unreachable statistics for all configured
interfaces. The optional interface-type and interface-number arguments
display the statistics for only one interface.
DF bit unreachables
500
# DF bit unreachables
---------------------
0
0
0
IP Application Services Configuration Guide, Cisco IOS XE Release 3S (Cisco ASR 1000)
Setting the MTU Packet Size
All other unreachables
500
# All other unreachables
------------------------
0
0
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