— Exhibit –
— Exhibit —
Refer to the Exhibit.
Referring to the exhibit, routers R1 through R5 exist in a fully-meshed IBGP group. You want the
routes received through EBGP on R1 to be advertised to the EBGP peer connected to R5. You
want the routes received through EBGP on R5 to be installed on R1; however, you do not want the
those routes to be advertised to the EBGP peer connected to R1.
Which two actions will accomplish this task? (Choose two.)
A.
Implement an export policy on R5 to add the well-known no-export community to the EBGP
routes.
B.
Implement an export policy on R5 to add the well-known no-advertise community to the EBGP
routes.
C.
Implement a route reflector group and configure the no-client-reflect parameter on the route
reflector.
D.
Implement an import policy on R1 to add the well-known no-export community to the EBGP
routes.
Explanation:
A. Is correct but how B is correct, those routes are needed on R1, if you B is correct, no-advertise then those routes will not be seen on R1. Can anybody explain please?
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OK, so i got the point, with no-advertise, routes will be advertised to R1 from R5 but will not be advertise beyond R1.
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Well-known Communities
The following communities have global significance and their operations shall be implemented in any community-attribute-aware BGP speaker.
NO_EXPORT (0xFFFFFF01)
All routes RECEIVED carrying a communities attribute
containing this value MUST NOT be advertised outside a BGP
confederation boundary (a stand-alone autonomous system that
is not part of a confederation should be considered a
confederation itself).
NO_ADVERTISE (0xFFFFFF02)
All routes RECEIVED carrying a communities attribute
containing this value MUST NOT be advertised to other BGP
peers.
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there must be a correction, routes received on R1 via IBGP not EBGP??? and the same on don’t want to advertised routes to IBGP peers connected to R1……??
then the answer and logic seems correct……
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Seems like the question is trying to refer to R2 instead of R1 (i suppose this is one of the many typos in this dump), then the answer should be A & D
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