From: Brian McGahan (brian@xxxxxxxxxxxxxxx)
Date: Sun Aug 25 2002 - 21:12:55 GMT-3
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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