From: Brian McGahan (bmcgahan@internetworkexpert.com)
Date: Mon Jun 13 2005 - 18:12:36 GMT-3
Hans,
This is accomplished by manipulating BGP attributes per the BGP
best path selection process. The bestpath selection process can be
found here:
http://www.cisco.com/warp/public/459/25.shtml
Typically the attributes of weight and local-preference are used
to affect how traffic leaves your AS. Modifying these attributes on
inbound routing information will affect the outbound path selection.
The attributes of AS-Path and MED are used to affect how traffic enters
your AS. Modifying these attributes on outbound routing information
will affect the inbound traffic flow.
For specific route-map syntax see the following link:
http://www.cisco.com/en/US/products/sw/iosswrel/ps1835/products_command_
reference_chapter09186a00800ca79e.html#wp1170638
HTH,
Brian McGahan, CCIE #8593
bmcgahan@internetworkexpert.com
Internetwork Expert, Inc.
http://www.InternetworkExpert.com
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> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
Of
> Hans None
> Sent: Monday, June 13, 2005 2:44 PM
> To: ccielab@groupstudy.com
> Subject: control bgp traffic flow
>
> All,
>
>
> I have heard that there is a way to control bgp traffic flow.
>
> for example, on a specific ebgp router, there are muiltple ebgp
service
> providers connecting on to it.
>
> if traffic is coming from service provider A, the router needs to send
> traffic back to service provider A.
>
> if traffic is coming from service provider B, the router needs to send
> traffic back to service provider B.
>
> this is realized by bgp route map.
>
> Can anyone let me know how to do that?
>
> Thanks,
>
>
> Hans
>
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