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is there any way out of the BGP 13 best-path rule?

thanks

1 ACCEPTED SOLUTION

Accepted Solutions
Cisco Employee

Re: is there any way out of the BGP 13 best-path rule?

Hi wlsj,

You can definitely use the cost extended community attribute to influence the BGP pest path selection process.

Please refer to the following document for more information:

http://www.cisco.com/en/US/docs/ios/12_0s/feature/guide/s_bgpcc.html

Regards,

Harold Ritter
Sr. Technical Leader
CCIE 4168 (R&S, SP)
harold@cisco.com
México móvil: +52 1 55 8312 4915
Cisco México
Paseo de la Reforma 222
Piso 19
Cuauhtémoc, Juárez
Ciudad de México, 06600
México
5 REPLIES

Re: is there any way out of the BGP 13 best-path rule?

Hi WLSJ,

What do you have now and what are you trying to accomplish?

Cheers:

Istvan

Community Member

Re: is there any way out of the BGP 13 best-path rule?

i thought there must be some other best path selection method,like extcommunity cost,i want to know more route control method

Re: is there any way out of the BGP 13 best-path rule?

Hi WLSJ,

Of course, you can use communities to influence path selection, but this will not override the general policy of route selection criteria for BGP.

However, there may be other features in BGP that I don't know about.

Let's wait for others to look at your request.

Cheers:

Istvan

Hall of Fame Super Gold

Re: is there any way out of the BGP 13 best-path rule?

You can certainly make use of ext communities or cost or other things to influence BGP routing. But you use them to influence things like Local Preference, or Weight which are within the general path selection criteria.

To answer the original question: no there is not a way to select BGP routes that is outside of the normal 13 step path selection criteria.

As Istvan says, if you can tell us what you are trying to accomplish perhaps we can suggest ways to achieve it.

HTH

Rick

Cisco Employee

Re: is there any way out of the BGP 13 best-path rule?

Hi wlsj,

You can definitely use the cost extended community attribute to influence the BGP pest path selection process.

Please refer to the following document for more information:

http://www.cisco.com/en/US/docs/ios/12_0s/feature/guide/s_bgpcc.html

Regards,

Harold Ritter
Sr. Technical Leader
CCIE 4168 (R&S, SP)
harold@cisco.com
México móvil: +52 1 55 8312 4915
Cisco México
Paseo de la Reforma 222
Piso 19
Cuauhtémoc, Juárez
Ciudad de México, 06600
México
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