[c-nsp] bgp bestpath w/o bgp always-compare-med

[Nikolay Shopik]

Router-ID are following:

81.91.X.X
91.194.X.X
82.198.X.X

I don't have bgp best path compare-routerid enabled also.

On 11/10/11 13:34, Saku Ytti wrote:
> You don't have router-id there, maybe one of the conditions why
> router-id is being compared is taking force. Would router-id explain
> the preference?
>
> http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a0080094431.shtml
>
> ------
> When both paths are external, prefer the path that was received first
> (the oldest one).
>
> Skip this step if any of these items is true:
>
> - You have enabled the bgp best path compare-routerid command.
>
> - The router ID is the same for multiple paths because the routes were
> received from the same router.
>
> - There is no current best path.
>
> The current best path can be lost when, for example, the neighbor that
> offers the path goes down.
> -------
>
> On 11 October 2011 12:18, Nikolay Shopik<shopik at inblock.ru>  wrote:
>> Hi,
>>
>> I have rather strange best path selection. We have 3 uplinks, AS_PATH to one
>> of prefix is same for all 3 prefixes, so my assumption it will use oldest
>> one, because everything else is same. Except one thing I notice one of
>> uplinks send us metric, while two others does not.
>>
>> Here is example, first one is oldest, second is youngest, but it still
>> choices last one. While should choice first, because everything else is
>> same.
>>
>>   39792 9002 25532
>>       Origin IGP, metric 400, localpref 100, valid, external
>>       Community: 39792:3000 39792:3004
>>   41095 9002 25532
>>       Origin IGP, localpref 100, valid, external
>>       Community: 41095:2000 41095:2001 41095:2100 41095:2101
>>   30733 9002 25532
>>       Origin IGP, localpref 100, valid, external, best
>>       Community: 9002:0 9002:64667 30733:6022
>>
>> I start to believe it using metric anyway, while I don't use that option.
>> What I missing here?
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>
>
>