From: S Malik (ccie.09@gmail.com)
Date: Tue Sep 30 2008 - 18:47:21 ART
Let me try it differently,
If you use gateway option then it means that you are trying to controle the
sources of routing updates. If you use prefix list (with gateway) with
permit option along with interface, it means you want routes ONLY from that
source on that interface and routes from other sources on that interface
will be filtered out.
For example R1 has two neigbors R2 & R3 on FastEthernet 0/0 interface. R1
has IP address of 172.16.0.1/24, R2 172.16.0.2/24 and R3 172.16.0.3/24
and you configure following on R1
router eigrp 1
distribute-list gateway neighbor-R2 in FastEthernet 0/0
!
ip prefix-list neighbor-R2 seq 5 permit 172.16.0.2/32 <http://172.16.0.1/32>
It means routes from 172.16.0.2 is permitted but any routes from
172.16.0.3will be denied.
If you change your prefix list to following,
ip prefix-list neighbor-R2 seq 5 permit 172.16.0.3/32 <http://172.16.0.1/32>,
you will receive routes from ONLY from 172.16.0.3 and routes from
172.16.0.2will be denied.
Second question of distribute-list in, is for the whole routing table, means
you want your router to put routes in the main routing table which are
specifically permitted by the ACL.
On Tue, Sep 30, 2008 at 4:21 PM, CCIE unnumbered
<ccie.unnumbered@gmail.com>wrote:
> Not very clear to me. I thought both will introduce same routes into
> EIGRP?
> Can some one please explain in more details?
>
> Thanks,
> ccie.unnumbered
>
>
> On Tue, Sep 30, 2008 at 3:59 PM, S Malik <ccie.09@gmail.com> wrote:
>
>> 1- filter routes arriving on interface f0/0 from gateway neighbor-R2
>>
>> 2- Routes permitted by the ACL will enter into the main routing table and
>> rest will be filtered out.
>>
>> Any one please correct if wrong.
>> On Tue, Sep 30, 2008 at 3:21 PM, CCIE unnumbered <
>> ccie.unnumbered@gmail.com> wrote:
>>
>>> Dear GS,
>>>
>>> What is the difference between the following configurations:
>>> (1)
>>> router eigrp 1
>>> distribute-list gateway neighbor-R2 in FastEthernet 0/0
>>> !
>>> ip prefix-list neighbor-R2 seq 5 permit 172.16.0.1/32
>>>
>>> (2)
>>> router eigrp 1
>>> distribute-list 1 in
>>> !
>>> access-list 1 permit host 172.16.0.1
>>>
>>>
>>> Thanks,
>>>
>>>
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>>
>
>
> --
> CCIE unnumbered
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