[j-nsp] AS-PAth Prepend and Loop Command

[Chris Morrow]

On Mon, 7 Jan 2008, Leigh Porter wrote:

>
> Here here.. Who's idea was that?
>

perhaps someone doesn't want the other end talking to them? This I've seen 
used as a security measure at times:  "AS1 is really bad, they have a 
giant route list I can't filter that how about I just don't accept their 
routes? Oh, I could do that by prepending their AS on my announcements, 
done!"

> Scott Morris wrote:
>>> From a technical standpoint, yes.  BGP sees a loop whenever it sees its own
>> AS in the path.
>>
>>> From a political/personal standpoint, you need to reach out and smack the
>> brainchild that is prepending YOUR AS into their BGP records.  It would

they might be doing it for a reason they feel is valid (see above)

>> serve them right to not be reached.

that might be their intent...

>>
>> Just my thoughts.
>>
>> Scott
>>
>>
>> -----Original Message-----
>> From: juniper-nsp-bounces at puck.nether.net
>> [mailto:juniper-nsp-bounces at puck.nether.net] On Behalf Of Reza Sharifi
>> Sent: Sunday, January 06, 2008 5:12 PM
>> To: juniper-nsp at puck.nether.net
>> Subject: [j-nsp] AS-PAth Prepend and Loop Command
>>
>> Hi All,
>>
>> If I have an external BGP connection to my neighbor, and if the neighbor is
>> Prepending my own AS to the routes that is sending to me, do I need to
>> implement the command " set routing-options autonomous-system loop to all of
>> my internal routers inside my AS in order to get those routes?
>> So far, the only way I have been able to get the routes to all my internal
>> routers is by applying the loop command, and do a clear BGP neighbor
>> soft-inbound I am running JUNOS 7.3R3.6, Is there any other way of
>> implementing this?
>>
>> Thanks,
>> Reza
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