Wednesday, February 12, 2014

Here's your CCNP ROUTE and TSHOOT Training Post for Wednesday, Feb. 12!

Thanks for making my CCNP ROUTE Study Guide the #2 Top Rated Networking Book on Amazon!

Having my books rank so highly is truly a dream come true for me. Thanks for making it happen!

Let's get right to today's questions, and weather permitting, I'll have a new video for you on Thursday!

1.   You've just performed BGP route aggregation.   While checking the BGP tables on downstream routers, you note the aggregation was successful and you see the aggregate route, but you also see the routes that were aggregated. You just want the downstream routers to have the aggregate route.

Which of the following is true of this scenario?

A.   This isn't possible.  When route aggregation works correctly, the aggregated routes will never be seen on a router that also has the aggregate route.

B.  You ran the aggregate-address command with the no-summary option.

C.  This is the normal and expected behavior after running the aggregate-address command with no additional options.

D.  You need to run the aggregate-address command with the summary-only option to get rid of the more-specific routes.

2.  Short answer:   The first two steps in the BGP path selection process are weight comparison and local preference comparison.  If those two values are the same for the routes being compared, what value is compared next?

3.  While checking your BGP routing tables, you note some routes with a next-hop route with a zero for each octet.  Which of the following is true?

A.  This indicates a BGP Active route, and the zeroes should go away shortly.

B.  Those are BGP Passive routes and they are in use by the router.

C.  The route is locally originated.

D.  The route was learned via route redistribution.

The answers after this very brief announcement!

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Let's get to those answers!

1.  Both C and D are correct.   If you use the aggregate-address command with no additional options, you'll get the aggregate route and it will be advertised, but the more-specific routes will ALSO be advertised.  To get the aggregate route without the more-specific routes continuing to be advertised, use the summary-only option with that command.

2.   The third factor is the preference of a locally originated route.

3.  C and D are correct.    There's no problem with a BGP route having a next-hop of, and this can indicate a route learned by route redistribution or a locally originated route.

That's it for today!  Weather permitting, I'll see you with a new video on Thursday!

Chris Bryant
CCIE #12933
"The Computer Certification Bulldog"

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