From: Arifur Rahman (arahman@cisco.com)
Date: Tue May 04 2004 - 02:12:56 GMT-3
Hi
I did not see 3rd one so far, is this manipulating origin code?
thank you - Arif
At 02:05 PM 5/3/2004 +0000, Stephen Skinner wrote:
>Thanks for the confirmation ,
>
>as to the new problem ...hmmm..
>
>s hint i think would be in order
>
>
>cheers
>
>>From: "Kenneth Wygand" <KWygand@customonline.com>
>>Reply-To: "Kenneth Wygand" <KWygand@customonline.com>
>>To: "Kian Wah, Lai" <kian_wah@qala.com.sg>, "Stephen Skinner"
>><stephen_ski@hotmail.com>, <ccielab@groupstudy.com>
>>Subject: RE: Lab workbook Preferred route (Quiz #4 too!)
>>Date: Sun, 2 May 2004 12:27:21 -0400
>>
>>That's a third way I didn't even consider... :)
>>
>> -----Original Message-----
>> From: Kian Wah, Lai [mailto:kian_wah@qala.com.sg]
>> Sent: Sun 5/2/2004 12:22 PM
>> To: Kenneth Wygand; 'Stephen Skinner'; ccielab@groupstudy.com
>> Cc:
>> Subject: RE: Lab workbook Preferred route (Quiz #4 too!)
>>
>>
>>
>> Hi,
>>
>> AS Path?
>>
>> Router A:
>> Route-map
>> Match ip add <ip of F>
>> Set as-path prepend x
>>
>> Then apply to a neighbor. Can this work?
>>
>> Regards,
>> Kian Wah, Lai
>>
>> -----Original Message-----
>> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On
>> Behalf Of
>> Kenneth Wygand
>> Sent: Sunday, May 02, 2004 11:41 PM
>> To: Stephen Skinner; ccielab@groupstudy.com
>> Subject: RE: Lab workbook Preferred route (Quiz #4 too!)
>>
>> Steve,
>>
>> Your "pseudo-commands" are correct. Keep in mind these "set metric"
>> commands must be tied to your external BGP sessions through
>> "route-map"
>> attributes on your "neighbor" statements. This will inherently
>> provide
>> redundancy because MED is a preferential variable. It will
>> _prefer_ one
>> route over the other, but will fall back to the route with the
>> higher MED if
>> the route with the lower MED is unavailable. The reason this is
>> stated in
>> the practice lab question is so that you don't _filter_ out the
>> lesser-preferred route, leaving only the preferred route in the
>> BGP table.
>>
>> Your answer is correct. However, take a spin off of this
>> question.
>>Imagine
>> the scenario also stated "You can only use a single "set metric"
>> statement
>> within the route-map tied to each external neighbor".
>>
>> This is one of those pitfalls the lab can easily throw you
>> into. I can
>> immediately think of at least two ways this can be accomplished,
>> one of
>> which is unconventional. However, this is the thinking you need
>> to pass the
>> lab!!
>>
>> If I don't receive the correct answer soon, I'll email it
>> out. Or maybe
>> I'll give a hint. For now, see whose BGP skills are sharp and
>> write back!
>> :)
>>
>> Good luck!
>> Ken
>>
>> -----Original Message-----
>> From: nobody@groupstudy.com on behalf of Stephen Skinner
>> Sent: Sun 5/2/2004 9:18 AM
>> To: ccielab@groupstudy.com
>> Cc:
>> Subject: Lab workbook Preferred route
>>
>>
>>
>> Guys,
>>
>> have another question ,
>>
>> again i am trying to understand what the question is
>> asking ..aswell
>> as how
>> to do it....
>>
>>
>> i ahve learnt that question interpretation is 80% of the
>> lab....if i
>> don`t
>> know what you are asking i don`t know what to do !!!!
>>
>> i have two routers ..router A and B ,they have external
>> BGP peers
>> router
>> BGP1(router a) and BGP (Router b)
>>
>> these two router`s connect over FR to Router F point to
>> multi
>>
>> bgp I betwen A,B ,F
>> bgp E between A, BGP1 and B,BGP2
>>
>> i want to manipulate my external peers ( ie advertise out)
>>
>> the question is ....
>>
>> make Router B the preferred entry point to get to Router F
>> make router A the prefered entry point to get to router A
>>
>> make sure there is redundency for bo th routes
>>
>> now i think that MED will do this on router B to get to
>> F and MED on
>> router
>> A to get to itself
>>
>> but how about the redundency ...
>> simply med again ...
>>
>> i.e router B
>> med 50 router F
>> med 100 router A
>>
>> router A
>> med 100 router F
>> med 50 router A
>>
>> is this right ???
>>
>> any help / config`s would be great
>>
>> many thanks
>>
>> steve
>>
>>
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