[isp-bgp] Route-map bgp

["Jacques VUVANT" <jacques.vuvant@...>]

Hi folks

Someone can tell me if following route-map configurations are
equivalents:

Conditions: Prefix-list VERS-NTT and VERS-PK5 will be prepended instead
of VERS-GAL

!Configuration 1
!
route-map TEL6453-OUT permit 20
 match ip address prefix-list VERS-PK5
 match as-path 2
 set as-path prepend 18200 18200 18200
!
route-map TEL6453-OUT permit 25
 match ip address prefix-list VERS-NTT
 match as-path 2
 set as-path prepend 18200 18200 18200
!
route-map TEL6453-OUT permit 30
 match as-path 2
!
route-map TEL6453-OUT permit 40
 match as-path 3
!
===============================================
!Configuration 2
route-map TEL6453-OUT permit 20
 match ip address prefix-list VERS-GAL
 match as-path 2
!
route-map TEL6453-OUT permit 25
 match as-path 2
 set as-path prepend 18200 18200 18200
!
route-map TEL6453-OUT permit 30
 match as-path 3
!

Thanks for any answer

Jacques VUVANT
Network OPT New-Caledonia
Phone	: +687-267541
Fax	: +687-278444
Mobile	: +687-773121
Mail	: Jacques.vuvant@opt.nc 


-----Message d'origine-----
De : Tulip Rasputin [mailto:tulip_rasputin@...] 
Envoyé : jeudi 20 mai 2004 17:39
À : isp-bgp@isp-bgp.com
Objet : [isp-bgp] MEDs from different ASes

Hello,

I am able to comprehend the concept of comparing MEDs for the routes
that we
recieve from the same AS. What confuses me is when, would we really want
to
compare MEDs across different ASes? MEDs can mean different things to
different operators, one could be reflecting the internal IGP costs in
the
MED, the other could be doing something totally different. How and in
what
scenario, will we want to compare MEDs across different ASes?

Can anybody throw any light on this? Has anybody ever done that? And if
yes,
then when?

One reason which i can think of at the top of my head is to avoid RFC
3345
oscillations. We may use always-compare-MED to prevent those. But then
there
are many topological solutions that can help prevent those oscillations.

Thanks,
Rasputin




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