From: Brian McGahan (brian@xxxxxxxxxxxxxxx)
Date: Sun Aug 25 2002 - 22:36:06 GMT-3
Peng,
You could solve this problem a number of ways. However, the
most obvious solution for this problem is to set the community for these
prefixes to NO-EXPORT. Suppress-map is used for suppressing specific
routes that are part of an aggregate, however you could just filter the
prefixes using a route-map attached to the neighbor statement.
HTH
Brian McGahan, CCIE #8593
Director of Design and Implementation
brian@cyscoexpert.com
CyscoExpert Corporation
Internetwork Consulting & Training
http://www.cyscoexpert.com
Voice: 847.674.3392
Fax: 847.674.2625
> -----Original Message-----
> From: Peng Zheng [mailto:zpnist@yahoo.com]
> Sent: Sunday, August 25, 2002 8:19 PM
> To: Brian McGahan; ccielab@groupstudy.com
> Subject: RE: Cyscoexpert Sample Lab
>
> Thanks.
> So if that means R4 can use suppress-map to R2 and R1
> instead of set community for those routes for the new
> question?
>
>
>
>
>
> --- Brian McGahan <brian@cyscoexpert.com> wrote:
> > Peng,
> >
> > See answers inline.
> >
> > > -----Original Message-----
> > > From: nobody@groupstudy.com
> > [mailto:nobody@groupstudy.com] On Behalf
> > Of
> > > Peng Zheng
> > > Sent: Sunday, August 25, 2002 5:35 PM
> > > To: ccielab@groupstudy.com
> > > Subject: Cyscoexpert Sample Lab
> > >
> > > Hi,
> > >
> > > I have a new question:
> > >
> > > For Cyscoexpert Sample Lab, on router 4, we set
> > the
> > > community to no-export. Do we need to configure
> > > neighbor send-community for route 3?
> >
> > You are correct in the assumption that R4 will not
> > send this
> > community value to any neighbor, including R3.
> > However, since R3 has no
> > BGP neighbors besides R4, it wouldn't really
> > accomplish anything to send
> > him the community values. Were R3 to have another
> > exit point from the
> > AS, then it would be appropriate to send the
> > community values.
> >
> > <snip>
> >
> > > I have some questions about the configuration for
> > > Cyscoexpert Sample Lab.
> > >
> > > First: for question 5 under C.1
> > >
> > > 5. R1 should not see a default route from R2.
> > >
> > > How has it been implemented?
> > >
> > > I think it's implemented by configured area 12 as
> > > NSSA.
> > >
> > > Am I right?
> >
> > Correct. Unlike a stub area, the NSSA ABR will not
> > originate a
> > default into the NSSA by default (no pun intended).
> > To get the NSSA ABR
> > to generate a default, the syntax is:
> >
> > "area 12 nssa default-information-originate"
> >
> > >
> > > Second: for question 3 under E.3.
> > >
> > > 3. The rest of the routing domain should only see
> > one
> > > route to these network.
> > >
> > > I think it has been done by:
> > >
> > > ip summary-address eigrp 100 220.1.0.0
> > 255.255.252.0 5
> > >
> > > Am I right?
> >
> > Yep.
> >
> > > If so, that means when we use ip summary-address
> > eigrp
> > > command, it will only advertise the summary
> > adress,
> > > like summary-only under BGP. Is it right?
> >
> > Yep.
> >
> > > 3. Why has 0.0.0.0 been used as wildcard-mask all
> > the
> > > time? What's the advantage?
> >
> > The "network" statement in IGP doesn't actually
> > mean which
> > networks you are advertising. It means which
> > interfaces are
> > participating in the protocol. For example:
> >
> > Router EIGRP 1
> > Network 1.2.3.4 0.0.0.0
> >
> > This means that only the interface 1.2.3.4 is
> > participating in the EIGRP
> > domain.
> >
> > Router EIGRP 1
> > Network 0.0.0.0
> >
> > This means that all interfaces are participating in
> > the EIGRP domain. I
> > always use 0.0.0.0 for clarity. I suppose it's just
> > a matter of
> > preference.
> >
> > HTH
> >
> > Brian McGahan, CCIE #8593
> > Director of Design and Implementation
> > brian@cyscoexpert.com
> >
> > CyscoExpert Corporation
> > Internetwork Consulting & Training
> > http://www.cyscoexpert.com
> > Voice: 847.674.3392
> > Fax: 847.674.2625
> >
> >
>
>
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