From: Marc La Porte (marc.a.laporte@gmail.com)
Date: Wed Aug 20 2008 - 08:40:28 ART
Hi,
The solutions guide says:
"Prevent the summary from entering the RIB. This is commonly needed when the
router is using a less specific route (i.e. 0.0.0.0/0) to reach part of the
164.x.0.0/16 network"
Check out this link:
http://www.groupstudy.com/archives/ccielab/200610/msg00716.html
Marc
On Wed, Aug 20, 2008 at 1:18 PM, Jonny English <redkidneybeans@gmail.com>wrote:
> Hi,
>
> I was wondering if some could please help me understand this task. I got
> the
> aggregate part, but i'm confused as to why the distance command is used on
> R4
>
> I don't understand why the distance bgp 20 200 255 command is used on R4.
>
> Is it because we want the default route advertised into OSPF in an earlier
> question to be more preferred, so by changing the distance of the bgp
> routes
> the OSPF default route is preferred?
>
> So the distance is used to reject the aggregate in AS 100?
>
> Rack1R4#sh ip bgp
> BGP table version is 17, local router ID is 150.1.4.4
> Status codes: s suppressed, d damped, h history, * valid, > best, i -
> internal,
> r RIB-failure, S Stale
> Origin codes: i - IGP, e - EGP, ? - incomplete
>
> Network Next Hop Metric LocPrf Weight Path
> *> 28.119.16.0/24 204.12.1.254 0 0 54 i
> *> 28.119.17.0/24 204.12.1.254 0 0 54 i
> *> 112.0.0.0 204.12.1.254 0 54 50 60 i
> *> 113.0.0.0 204.12.1.254 0 54 50 60 i
> *> 116.0.0.0 204.12.1.254 0 54 i
> *> 117.0.0.0 204.12.1.254 0 54 i
> *> 118.0.0.0 204.12.1.254 0 54 i
> *> 119.0.0.0 204.12.1.254 0 54 i
> r> 164.1.0.0 0.0.0.0 32768 i
> r 150.1.3.3 0 200 i
> s> 164.1.3.0/24 150.1.3.3 0 0 200 i
> *> 205.90.31.0 150.1.3.3 0 200 254 ?
> *> 220.20.3.0 150.1.3.3 0 200 254 ?
> *> 222.22.2.0 150.1.3.3 0 200 254 ?
>
> Rack1R4#sh run | s router bgp
> router bgp 100
> aggregate-address 164.1.0.0 255.255.0.0 summary-only
> distance bgp 20 200 255
>
> Thanks for the help
>
>
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