BGP advertise-best-external on RR

Jeff Tantsura jeff.tantsura at ericsson.com
Tue Aug 25 09:37:14 UTC 2015


Hi,

In your case I¹d recommend to use diverse path, due to its simplicity and
non disruptive deployment characteristics.
As you know - diverse path requires additional BGP session per additional
(second, next, etc) path, in most cases not a problem, however mileage
might vary.

To my memory, in Cisco land - it has only been implemented in IOS, not XR,
please check.   

Cheers,
Jeff




-----Original Message-----
From: Diptanshu Singh <diptanshu.singh at gmail.com>
Date: Monday, August 24, 2015 at 10:53 PM
To: Mohamed Kamal <mkamal at noor.net>
Cc: "nanog at nanog.org" <nanog at nanog.org>
Subject: Re: BGP advertise-best-external on RR

>Yes . In the case of diverse path , shadow route reflector will be the
>one wherever  you enable commands to trigger diverse path computation.
>
>Good thing with diverse path is that the RR-Clients don't have to have
>any support but bad thing is that it can only reflect One additional
>best-path( second best path ) .
>
>Sent from my iPhone
>
>> On Aug 24, 2015, at 2:31 PM, Mohamed Kamal <mkamal at noor.net> wrote:
>> 
>> It's only supported on the 15.2(4)S and later not the SRE train. I
>>might consider an upgrade.
>> 
>> One more question regarding this, can you configure the RR to be the
>>main and shadow RR?
>> 
>> Mohamed Kamal
>> Core Network Sr. Engineer
>> 
>>> On 8/24/2015 9:16 PM, Diptanshu Singh wrote:
>>> BGP Add-Path might be your friend . You can look at diverse-path as
>>>well .
>> 




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