3900 router

[onyx_oyin]

Please my Cisco 3900 router is not taking the no auto summary command?

Any work around
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[blau grana]

Hello,

Could you be more specific? Do you configure EIGRP or BGP? Can you provide output of error message?

What you exactly mean by "not taking"?

Best Regards

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[onyx_oyin]

It is Eigrp. When you do a sh run the no auto summary command does not show

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[Rahul Kukreja]

From Command Lookup Tool -

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auto-summary (EIGRP)

To allow automatic summarization of subnet routes into network-level routes, use the auto-summary command in router configuration mode or address-family topology 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.

Command Default

The behavior of this command is enabled by default (the software does not send subprefix routing information across classful network boundaries).

Cisco IOS Release 15.0(1)M, 12.2(33)SRE, 12.2(33)XNE, Cisco IOS XE Release 2.5, Cisco IOS Release 12.2(33)SXI4 and Later Releases

The behavior of this command is disabled by default (the software sends subprefix routing information across classful network boundaries).

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Thus the command default for 15.0 onwards on Routers is DISABLED BY DEFAULT. Earlier it was enabled by default

So you will not see in show runn, but it is still applied.

You could confirm if it is diabled by looking at the output of show ip protocols and it will show you Automatic Summarization is diabled.

Regards,

Rahul

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[blau grana · Accepted solution]

Yop, as Rahul said, some commands are not shown no sh run configuration if they are in default state, but it does not mean that they have no a affect.

Try to configure:

auto-summary and you will see this command in configuration, if you then delete that command no auto-summary, it will disapear from configuration, because you returned it to deafult state.

If you want to see configuration with all default values, run #show running-config all

Best Regards

Please rate all helpful posts and close solved questions

[onyx_oyin]

Thanks a lot I have seen that automatic summarization : disabled

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