From: Peng Zheng (zpnist@xxxxxxxxx)
Date: Sun Aug 25 2002 - 22:19:04 GMT-3
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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