The MPLS-OPS Archive

[Spice Sylvia <falsesylvia@yahoo.co.uk>]

Devandra,

 

there maybe a way if you can tell us more about the network.

 

there are attributes in BGP which might help in certain conditions to enable what you need.

 

Not sure if there is anything juniper specific though.

"M. ELK" <elkou141061@hotmail.com> wrote:

Hi Amos

Not clear how TE alone will help here .
My guess that the only solution is the "ugly" policy based routing along
with TE .
A special case :
if such pool are connected to a specific PE ,ie: say PE1 where no other pool
are
also connected to PE1 .
Over PE1 , we could do any BGP trick to prefer BGP route comming from ASBR1
over ASBR2 .
Run A TE tunnel from PE1 to ASBR1 (this to prevent any node along the path
within the AS diverting the traffic to ASBR2 if such node selected ASBR2 as
the best path for such destination ) .
ASBR1 should advertise this POOL with lower MID than ASBR2 (if the same
provider) or
ASBR2 prepend AS NBR (if differen provider ) to ensure that the return path
is also via ASBR1.

Pls comment.

Brgds




>From: "Amos Rosenboim"
>To: ,
>Subject: RE: [MPLS-OPS]: BGP Tweaking query
>Date: Wed, 24 Mar 2004 12:40:28 +0200
>
>Hi,
>
>One of the limitations that ip routing presents is that it's done (at
>its "natural" way only by looking at the destination ip.
>An "ugly" solution for your request would be to use policy based routing
>- this kind of solution has many limitations.
>A more "elegant" solution is to use mpls traffic engineering to get the
>results you need.
>
>Regards
>Amos
>
>
>
>-----Original Message-----
>From: Devendra.Vyas@relianceinfo.com
>[mailto:Devendra.Vyas@relianceinfo.com]
>Sent: Wednesday, March 24, 2004 12:13 PM
>To: mpls-ops@mplsrc.com
>Subject: [MPLS-OPS]: BGP Tweaking query
>
>
>
>
>
>
>if general routing questions are outside the domain of this list..excuse
>me.
>
>
>anyway-
>
>if i have some prefixes that i announce and i am multihomed - i
>want a particular pool to always exit (outgoing) to the internet via a
>particular link.
>
>how can i tweak bgp (wrt juniper)for solving this.or will BGP will take
>the
>best path on its own everytime.
>
>
>Thanks & Regards,
>
>Devendra Vyas
>
>
>
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