In the BGP routing protocol, the asbr-summary command can be followed by the not-advertise parameter. The meaning of this parameter is not to advertise summary routes.

Question

Options

• ATRUE
• BFALSE

• A
  75% (45)
• B
  25% (15)

Explanation

Option A is correct because the not-advertise parameter on the asbr-summary command explicitly suppresses the advertisement of the configured summary route to neighboring routers, meaning it acts as a black-hole route locally without being propagated. This behavior is intentional - it prevents routing loops by installing a discard route internally while keeping the summary off the wire. Option B is wrong simply because it contradicts the documented and actual behavior of the parameter: not-advertise does exactly what its name says - it withholds the summary from being advertised.

Memory tip: Think of not-advertise as "silent summarization" - the router knows about the aggregate internally (to drop unmatched traffic and avoid loops), but it tells no one else about it. If you see not-advertise, the route stays local.

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