An engineer is using communicates to control the routing information among BGP peers. A specific route must be know by iBGB peers, but it must not be peers. Which BGP community accomplish this goal?

The correct answer is D. no-export. The 'no-export' well-known BGP community instructs a router to not advertise the tagged route to any eBGP peers (outside the AS), while still sharing it with all iBGP peers within the same AS. This perfectly matches the requirement. 'no-advertise' (C) suppresses the route from…

Advanced Addressing and Routing Solutions

Question

Options

Ano-peer
Bno-export-subconfed
Cno-advertise
Dno-export

How the community answered

(16 responses)

A
13% (2)
B
13% (2)
C
6% (1)
D
69% (11)

Explanation

The 'no-export' well-known BGP community instructs a router to not advertise the tagged route to any eBGP peers (outside the AS), while still sharing it with all iBGP peers within the same AS. This perfectly matches the requirement. 'no-advertise' (C) suppresses the route from ALL BGP peers, including iBGP, which is too restrictive. 'no-export-subconfed' (B) prevents advertisement outside a confederation sub-AS but still permits sending to other confederation members. 'no-peer' (A) is not a standard well-known BGP community.

Topics

#BGP communities#no-export#iBGP#route policy

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