Friday, April 04, 2014

Happy BGP Day!

Well, isn't every day BGP Day?  Of course it is!

Let's celebrate with this new BGP practice exam in today's CCNP ROUTE and TSHOOT Training Post for Thursday, April 3!

1.  Identify the true statements regarding iBGP neighbors.

A.  A route learned from one iBGP neighbor cannot be advertised to another iBGP neighbor by default.

B.  iBGP neighbors must be directly connected.

C.  iBGP neighbors must be in the same BGP Autonomous System.

D.  The only way iBGP neighbors can form an adjacency is by using their loopback addresses in the neighbor statements.

2.   You've performed BGP route summarization with the following command:


Which of the following best describes the route or routes you should expect to see in downstream BGP route tables as a result?

A.  The summary route, and that's it.

B.  You won't see anything, since this command requires the use of a wildcard mask rather than the mask shown.

C.  You'll see the summary route and the routes being summarized.

D.  None of the above.

3.   Flash Card question!   Name the three BGP Origin attribute codes.

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1.  A, C. Routers are iBGP neighbors if they're in the same AS (that's the "internal" part), and by default a BGP router will not advertise a route to an iBGP neighbor if it was originally learned about from another iBGP neighbor.

2.  "C".   In this case, you'd expect to advertise the summary route AND the summarized routes.  If you only want the summary route advertised, you'd need to add the summary-only option, as shown below.

R1(config)#router bgp 100
R1(config-router)#aggregate-address ?
  A.B.C.D  Aggregate address

R1(config-router)#aggregate-address ?
  A.B.C.D  Aggregate mask

R1(config-router)#aggregate-address ?
  advertise-map  Set condition to advertise attribute
  as-set         Generate AS set path information
  attribute-map  Set attributes of aggregate
  route-map      Set parameters of aggregate
  summary-only   Filter more specific routes from updates
  suppress-map   Conditionally filter more specific routes from updates

3.  1. The BGP origin codes:
i -- IGP
e -- EGP
? -- "incomplete"

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'Nuff said!

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