[c-nsp] EIGRP Adversing Problem

Mark mac at telvia.it
Wed Oct 27 13:15:07 EDT 2004


I tried,

but net 10.0.0.0/16 is always advertised.

MArk


On Oct 27, 2004, at 1:51 PM, Oliver Boehmer ((oboehmer)) wrote:

> mark,
>
> so you want to advertise everything *except* 10.0.0.0/16 (incl. subnets
> of this range)? Then the following config should do what you want
>
> ip prefix-list private_IP deny 10.0.0.0/16 le 32
> ip prefix-list private_IP permit 0.0.0.0/0 le 32
> !
> router eigrp 1
>  distribute-list prefix private_IP out
>
> this should work..
>
> 	oli
>
> Mark <mailto:mac at telvia.it> wrote on Wednesday, October 27, 2004 1:42
> PM:
>
>> Thanks Oli,
>>
>> But I  announce all my net and suppress 10.0.0.0/16 (and smaller in
>> the net).
>> Actually my prefix filter do the contrary. :-(
>>
>> Where am I wrong?
>>
>> Mark
>>
>>
>> On Oct 27, 2004, at 11:43 AM, Oliver Boehmer ((oboehmer)) wrote:
>>
>>> Mark <mailto:mac at telvia.it> wrote on Wednesday, October 27, 2004
>>> 11:29 AM:
>>>
>>>> I tried, without success, this config.
>>>>
>>>> ip prefix-list private_IP permit 10.0.0.0/16
>>>> router eigrp XXXX
>>>> distribute-list prefix private_IP out
>>>>
>>>> Now ALL my network are FILTERED.
>>>>
>>>> Where i'm wrong???
>>>
>>> what do you want to achieve exactly? announce only 10.0/16 networks
>>> and suppress the rest? Your prefix list matches only the 10.0.0.0/16
>>> network, more specfics are suppressed.. In case you want to announce
>>> the
>>> more specifics subnets as well, use
>>>   ip prefix-list private_IP permit 10.0.0.0/16 le 32
>>>
>>> 	oli
>>>
>>>
>>>>
>>>> On Oct 27, 2004, at 1:33 AM, Mark wrote:
>>>>
>>>>> Oliver,
>>>>>
>>>>> can you write down an example of distribute-lists out for a
>>>>> specific network?
>>>>>
>>>>> Mark
>>>>>
>>>>>
>>>>> On Oct 26, 2004, at 7:59 PM, Oliver Boehmer ((oboehmer)) wrote:
>>>>>
>>>>>> Jason Lixfeld <> wrote on Tuesday, October 26, 2004 7:38 PM:
>>>>>>
>>>>>>> Use the eigrp router passive-interface command.
>>>>>>>
>>>>>>> http://www.cisco.com/en/US/tech/tk365/tk207/
>>>>>>> technologies_tech_note09186a0080093f0a.shtml
>>>>>>
>>>>>> passive-interface will only prevent an EIGRP adjacency being
>>>>>> formed over
>>>>>> this link, the link address will still be advertised.. the only
>>>>>> way to prevent this from happening was mentioned by Bruce earlier
>>>>>> :
>>>>>>
>>>>>>> Well, it depends.  You could adjust your "network" statements in
>>>>>>> EIGRP
>>>>>> to
>>>>>>> not include that network or subnetwork.  Or you could use
>>>>>> distribute-lists
>>>>>>> to filter it out.
>>>>>>
>>>>>> In halfway modern code (at least 12.2 and later, I think 12.1 as
>>>>>> well) you can use "network <network> <wildcard>" to exactly
>>>>>> specify the interfaces' addresses which you want to be covered by
>>>>>> EIGRP.. works similar to the way you setup OSPF..
>>>>>>
>>>>>> 	oli
>>>>>>
>>>>>
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>



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