From: John Jones (acer0001@gmail.com)
Date: Mon Jun 02 2008 - 23:19:49 ART
Thanks Lloyd and Narbik. I kind of figured that it could be associated with
confederations.
Thanks Narbik for the detailed explanation. It looks like it is a matter of
where the advertisement "boundary" lies.
John
On Mon, Jun 2, 2008 at 8:46 PM, Narbik Kocharians <narbikk@gmail.com> wrote:
> Besides the *confederation*, here are some choices:
>
> Let's say you have R1 in AS 100 and R2 in AS 200. R1 needs to advertise
> network 1.0.0.0/8 to R2, but it does NOT want the routers in AS 200
> advertise that route to any of their EBGP peers, R1 can accomplish this task
> in two ways:
>
> 1. R1 can identify the network, in this case 1.0.0.0/8, then configure a
> route-map and set the community to *no-export* and then send community and
> the route-map to R2.
> 2. R1 can identify the network, in this case 1.0.0.0/8, then configure a
> route-map and then set the community to *local-as* and then send the
> community and the route-map to R2.
>
> Now if R2 is advertising network 2.0.0.0/8 and it want that network to
> stay local (meaning in its own AS) and NOT be advertised to any EBGP peer/s,
> R2 can be configured using one of the following:
>
> 1. R2 can be configured to advertise network (2.0.0.0/8) using a network
> statement with a route-map, and the route-map just sets the community to *
> local-as*.
> 2. R2 can be configured to advertise network (2.0.0.0/8) using a network
> statement with a route-map, and the route-map just sets the community to *
> no-export*.
>
>
> On Mon, Jun 2, 2008 at 5:57 PM, John Jones <acer0001@gmail.com> wrote:
>
>> After searching the DocCD, I have been unable to find out the difference
>> between these, other than they are opposite logic. no-export means don't
>> sent a BGP update out of the AS. local-AS means keep the update within the
>> AS that the router is in.
>>
>> Is the difference when using confederations? I can see there the
>> significance, but is this the only one?
>>
>> Thanks, guys.
>>
>> John Jones
>> Networking, Linux & Storage Interconnect Trainer
>> Dell Inc.
>>
>>
>> _______________________________________________________________________
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>>
>>
>>
>>
>
>
> --
> Narbik Kocharians
> CCSI#30832, CCIE# 12410 (R&S, SP, Security)
> www.Net-Workbooks.com
> Sr. Technical Instructor
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