modification request for rs client feature

[Arnold Nipper]

on 22.12.2011 13:56 Ondrej Zajicek wrote:
> On Mon, Dec 19, 2011 at 10:08:52AM +0100, Arnold Nipper wrote:
>> Inspired by discussion on "Announce less specific prefix in routeserver
>> environment for upstream purpose (Message-ID:
>> <4EEB4448.7070007 at de-cix.net>) I would like to air the idea to modify
>> the behaviour of BIRD as a route server.
>>
>> The idea of a route server is that it "... reduces modifications to
>> advertised route attributes to be transparent (for example does not
>> prepend its AS number to AS PATH attribute and keeps MED attribute)."
>>
>> However in case that there is a BGP speaker (gateway GW ) which is in
>> the same ASN as the RS it is at least necessary to add the own ASN when
>> announcing prefixes originating in the ASN.
>>
>>
>> Hence I would like to propose to modify
>>
>>  do not prepend own AS number
>>
>> to
>>
>>  do not prepend owwn AS number except for prefixes learnt from iBGP
>>
>> Does that make sense?
> 
> Yes, it does make sense to me, because it is consistent with the current
> behavior on local (i.e. non-BGP) routes exported to BGP RS session.
> 

Changing the current behaviour would do no harm imho. Worst case is that
you do prepend. Right?

> Note that there is a draft on RS behavior, which does not mention this:
> http://tools.ietf.org/html/draft-jasinska-ix-bgp-route-server-03
> 

I've dropped the authors a note. I'll update the list.



Best regards,
Arnold
-- 
Arnold Nipper / nIPper consulting, Sandhausen, Germany
email: arnold at nipper.de      phone: +49 6224 5593407 2
mobile: +49 152 53717690     fax:   +49 6224 5593407 9

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