300-510 · Question #274
Refer to the exhibit. After maintenance to activate BGP neighbors connecting a new data center attached to R1, L3VPN customers attached to OSPF domain 100 lost connectivity to services in OSPF 200 and
The correct answer is D. Raise the maximum prefix limit on R2 to 1560 or more. The logs show the BGP session to 10.0.0.1 was torn down because R2 received 1,560 prefixes but its maximum-prefix was set to 1,500. Since the MPLS underlay and VPN routes within OSPF 100 remain, the issue is BGP prefixed being capped. Increasing the neighbor x.x.x.x maximum- pref
Question
Refer to the exhibit. After maintenance to activate BGP neighbors connecting a new data center attached to R1, L3VPN customers attached to OSPF domain 100 lost connectivity to services in OSPF 200 and OSPF 300. However, Unified MPLS services within OSPF 100 remain reachable. Which action must the network engineer take to resolve the outage?
Exhibit
Options
- AReset the BGP session between R1 and R2
- BActivate BGP neighbors between the new data center and R2 and R3
- CEstablish new MPLS LSPs from R1 to R2, R3 and R4
- DRaise the maximum prefix limit on R2 to 1560 or more
How the community answered
(28 responses)- A4% (1)
- B7% (2)
- C21% (6)
- D68% (19)
Explanation
The logs show the BGP session to 10.0.0.1 was torn down because R2 received 1,560 prefixes but its maximum-prefix was set to 1,500. Since the MPLS underlay and VPN routes within OSPF 100 remain, the issue is BGP prefixed being capped. Increasing the neighbor x.x.x.x maximum- prefix threshold on R2 to at least 1,560 (or higher) will prevent the session from dropping and restore L3VPN reachability.
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