From: Jonny English (redkidneybeans@gmail.com)
Date: Wed Aug 20 2008 - 09:04:04 ART
Thanks for that. But its confusing because when I remove the distance
command on R4, I can still ping R6....and BB1.. this is the strange bit that
I don't get.
On Wed, Aug 20, 2008 at 11:40 PM, Marc La Porte <marc.a.laporte@gmail.com>wrote:
> 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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> >
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