350-501 Services Practice Question
Exhibit
Refer to the exhibit. ! On PE router router bgp 65000 neighbor 10.1.1.1 remote-as 65000 neighbor 10.1.1.1 update-source Loopback0 ! address-family vpnv4 neighbor 10.1.1.1 activate neighbor 10.1.1.1 send-community extended neighbor 10.1.1.1 next-hop-self ! address-family ipv4 vrf CUST_A redistribute ospf 1 vrf CUST_A no synchronization ! !
Refer to the exhibit. Which statement about this BGP configuration is true?
⚠ Common exam trap
Cisco often tests the misconception that `next-hop-self` is only needed for eBGP peers, but in MPLS L3VPN it is essential for iBGP sessions to route reflectors to ensure correct next-hop reachability across the core.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The next-hop-self command ensures that the PE sets itself as the next-hop for routes advertised to the route reflector.
The `next-hop-self` command under the VRF address-family instructs the PE router to set its own IP address as the next-hop for routes advertised to the route reflector. This is necessary in MPLS L3VPN environments to ensure that the route reflector (and other PEs) can reach the customer prefix via the advertising PE, avoiding reachability issues when the original next-hop is not directly connected across the MPLS core.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The no synchronization command is invalid under address-family ipv4 vrf.
Why it's wrong here
No synchronization is valid, though deprecated.
- ✓
The next-hop-self command ensures that the PE sets itself as the next-hop for routes advertised to the route reflector.
Why this is correct
Next-hop-self is used to set the local router as next-hop.
- ✗
The send-community extended command is only needed for IPv4 unicast address family.
Why it's wrong here
Send-community is needed under VPNv4 for route-target.
- ✗
The redistribute ospf command will import OSPF routes into the VRF but not into BGP.
Why it's wrong here
Redistribute ospf under address-family ipv4 vrf imports OSPF routes into BGP for that VRF.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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