From: Chris McGuire (cmcguire@firstdigital.com)
Date: Sun Mar 30 2008 - 11:48:49 ART
Thanks, it does help a lot.
Chris
On 3/29/08 8:57 PM, "Joseph Saad" <joseph.samir.saad@gmail.com> wrote:
> Chris,
>
> There's in an explicit rule that "set" is ignore for iBGP peers outbound.
>
> This is documented in Doc CD, internal BGP
>
> Not sure if this is of any help.
>
> Joseph.
>
>
> On Sun, Mar 30, 2008 at 1:38 AM, Chris McGuire <cmcguire@firstdigital.com>
> wrote:
>> Thanks for labbing that up. Last night real late, I also tried my suggested
>> idea of changin the local pref outbound and was unsuccessful. Unless there
>> is some option I am not aware of, you are not allowed to change the local
>> pref out. Only in. So, back to square one that only the weight would force
>> it out, but apparently this is not allowed per the requirements.
>>
>> Thanks,
>> Chris
>>
>> On 3/29/08 4:28 AM, "Athaide, Dwayne" <DAthaide@eprod.com> wrote:
>>
>>> > External(54) - R1-R2-R3-External (54)
>>> >
>>> >
>>> >
>>> > I used weight on R1 inbound from the ebgp neighbor and weight on R2
>>> > inbound from the ibgp neighbor R1 to get the desired results.
>>> >
>>> >
>>> >
>>> > At first I used local preference on R1 for the routes coming from the
>>> > external and set them to 110. I also tried on R2 like you mentioned
>>> > below to change the Local preference back to 100 as it exit's to R3 to
>>> > 100 but was not successful in doing so with a route-map and access list.
>>> > The local preference would not change.
>>> >
>>> >
>>> >
>>> > 150.1.1.6 <http://150.1.1.6> is R3
>>> >
>>> >
>>> >
>>> >
>>> >
>>> > R2
>>> >
>>> > neighbor 150.1.1.6 <http://150.1.1.6> route-map LOCAL_OUT out
>>> >
>>> >
>>> >
>>> >
>>> >
>>> > route-map LOCAL_OUT permit 10
>>> >
>>> > set local-preference 100
>>> >
>>> >
>>> >
>>> > Thanks
>>> >
>>> > From: Chris McGuire [mailto:cmcguire@firstdigital.com]
>>> > Sent: Friday, March 28, 2008 10:15 PM
>>> > To: Daniel Valle
>>> > Cc: Athaide, Dwayne; groupstudy
>>> > Subject: Re: help with bgp
>>> >
>>> >
>>> >
>>> > Your absolutely right, I misread the question. Sounds like Dwayne has a
>>> > handle on it. I would say probably the only way is to force the
>>> > localpref back to 100 on R2 as it exits to R3... Then the logic of Ebgp
>>> > over Ibgp would come into play.
>>> >
>>> >
>>> > On 3/28/08 9:03 PM, "Daniel Valle" <danielfrvalle@gmail.com> wrote:
>>> >
>>> > Chris,
>>> >
>>> > The requirement he said in his question is to not touch R3. So that
>>> > woul'd be an option...
>>> >
>>> >
>>> > On 3/29/08, Chris McGuire <cmcguire@firstdigital.com> wrote:
>>> >
>>> > The best way to satisfy your requirement would be with changing the
>>> > Weight
>>> > on R3 inbound from the external AS to a higher priority. This will cause
>>> > R3
>>> > and R3 alone to prefer the route out. Other routers in their AS will
>>> > continue to use the Local preference assigned by R1.
>>> >
>>> > I understand the logic of EBGP (pref 20) over Ibgp (pref 200). However,
>>> > BGP
>>> > will not look at this until way down the line. It will first look at the
>>> > Weight, then the local preference.... And actually 9th preference
>>> > prefers
>>> > EBGP over IBGP. So using the Weight would be optimal for your
>>> > requirement.
>>> >
>>> > http://www.cisco.com/en/US/docs/ios/12_2/ip/configuration/guide/1cfbgp.h
>>> > tml#
>>> > <http://www.cisco.com/en/US/docs/ios/12_2/ip/configuration/guide/1cfbgp.
>>> > html>
>>> > wp1000898
>>> >
>>> > HTH
>>> > -chris
>>> >
>>> >
>>> > On 3/28/08 2:01 PM, "Athaide, Dwayne" <DAthaide@eprod.com> wrote:
>>> >
>>>> >> (R1-R2-R3)
>>>> >>
>>>> >> Is there a way to stop the propagation of a modified local preference
>>>> >> value within an AS without making any configuration to the router that
>>>> >> needs to keep its default value. In this case R3. For example R1 and
>>> > R3
>>>> >> are connected to the same external AS and learning routes from the AS.
>>>> >> R1 has modified the routes learnt via the external AS by using local
>>>> >> preference. R2 now gets those routes and passes it on to R3. Now R3
>>>> >> uses R1 as an exit point. Anyway to have R3 ignore the higher local
>>>> >> preference it learns on R3 and have it exit directly by not making any
>>>> >> changes on R3.
>>>> >>
>>>> >> Thanks
>>>> >>
>>>> >>
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