RE: Lab workbook Preferred route (Quiz #4 too!)

From: Kian Wah, Lai (kian_wah@qala.com.sg)
Date: Sun May 02 2004 - 13:22:57 GMT-3

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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        http://www.msn.co.uk/specials/btbroadband
        
        

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