JN0-663 · Question #196
A Layer 3 VPN exists in the provider network and the CE devices are connecting to the PE devices using BGP. The PE devices are receiving BGP routes from the CE devices and the PE devices have the CE…
The correct answer is D. The PE devices are detecting an AS loop. By default, Junos OS does not advertise the routes learned from one EBGP peer back to the same external BGP (EBGP) peer. In addition, the software does not advertise those routes back to any EBGP peers that are in the same AS as the originating peer, regardless of the routing…
Question
A Layer 3 VPN exists in the provider network and the CE devices are connecting to the PE devices using BGP. The PE devices are receiving BGP routes from the CE devices and the PE devices have the CE BGP routes in their respective routing tables. However, the remote CE devices are not receiving the BGP routes. Referring to the exhibit, what is the problem?
Exhibit
Options
- AThe CE devices are detecting an AS loop
- BA VRF target community mismatch exists.
- CA route distinguisher mismatch exists.
- DThe PE devices are detecting an AS loop.
How the community answered
(35 responses)- A14% (5)
- B3% (1)
- C6% (2)
- D77% (27)
Explanation
By default, Junos OS does not advertise the routes learned from one EBGP peer back to the same external BGP (EBGP) peer. In addition, the software does not advertise those routes back to any EBGP peers that are in the same AS as the originating peer, regardless of the routing peer-as-edit-protocols-bgp.html
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