auto summary command issue

[datamodule]

I am having 2911 router running with C2900 Software (C2900-UNIVERSALK9-M), Version 15.1(4)M5, RELEASE SOFTWARE (fc1)IOS and i have configured the following commands for eigrp

router eigrp 100

network 10.20.0.0

no auto-summary

It takes all 3 commands but when i check through show run command i am not seeing no auto-summary command.

Can you please let me know is something wrong with my config

[Reza Sharifi]

That is because no auto-summary command is on by default.

auto-summary (EIGRP)

To restore the default behavior of automatic summarization of subnet routes into network-level routes, use the auto-summary command in router configuration mode. To disable this function and send subprefix routing information across classful network boundaries, use the no form of this command.

auto-summary

no auto-summary

Syntax Description

This command has no arguments or keywords.

Defaults

The behavior of this command is enabled by default (the software  summarizes subprefixes to the classful network boundary when crossing  classful network boundaries).

HTH

[datamodule]

thanks for that Please correct me if i am wrong

By default auto-summary will be enabled that is why we don't see but if i run no auto-summary command that should show.

This is new in

(C2900-UNIVERSALK9-M), Version 15.1(4)M5,

[Reza Sharifi · Accepted solution]

Correct, but this has been default before IOS 15.0 .  According to the command reference guide it is default starting with ver 10

http://www.cisco.com/en/US/docs/ios/12_2/iproute/command/reference/1rfeigrp.html#wp1017389

HTH

[datamodule]

Thank you

[Reza Sharifi]

Correction

The "auto summary" command started in ios 10, but the no auto summary started in 12.2(8)T.

here is the command reference guide for more info;

http://www.cisco.com/en/US/docs/ios-xml/ios/iproute_eigrp/command/ire-a1.html#GUID-DD4D7C28-4F31-4AC5-ABF7-697194696B10

HTH