From: Jason Morris (mcnever@gmail.com)
Date: Mon Jan 12 2009 - 19:57:35 ARST
for local-as to work you would have to set that community inbound on
R3. If that's out of your domain that's not really an option. If you
set the local-as community while its still inside AS10 it wont get
advertised out.
no-export = AS10 telling AS30 not to tell anyone else
local-as = AS10 not telling AS30 at all
or at least that's my understanding
On Mon, Jan 12, 2009 at 3:27 PM, CCIE To Be <ccie.tobe81@gmail.com> wrote:
> Got it....
>
> Other question is related to local-as community. Let suppose we don't want
> to advertise a specific prefix outside 'AS 10' then we will have again same
> option of no-export. What about using local-as community in this scenario
> which will not allow a particular prefix to go out of local AS 10 ??
>
>
>
> On Tue, Jan 13, 2009 at 12:01 AM, Huan Pham <pnhuan@yahoo.com> wrote:
>
>> No-export of course!
>>
>> Using no-advertise will prevent prefixes received from AS10 to be
>> advertized to R3 iBGP peers as well which are undesirable here.
>>
>> Sent from my iPhone
>>
>> On 13/01/2009, at 6:28 AM, CCIE To Be <ccie.tobe81@gmail.com> wrote:
>>
>> Dear Group,
>>
>> I have a confusion regarding usage of no-advertise and no-export
>> communities. I know that no-advertise means NOT TO ADVERTISE to any bgp
>> peer
>> ( iBGP & eBGP ) whereas no-export says NOT TO ADVERTISE to any eBGP peer
>> means don't advertise outside this AS. Consider the following topology,
>>
>> R1(AS 10) --------R2(AS 10)------------R3(AS 30)
>>
>> Let say AS 10 is advertising a prefix to AS 30 and requirement is that AS
>> 30
>> should not forward this prefix further to any other AS. Now we have option
>> to use either no-advertise or no-export on R2 towards R3. Both will give
>> the
>> desired result , what should be the recommended approach here ??
>>
>>
>> HTH
>>
>>
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>
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