350-501 Services Practice Question
Exhibit
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 exit-address-family address-family ipv4 vrf CUSTOMER redistribute connected exit-address-family
Refer to the exhibit. A PE router has this BGP configuration. The CE router is advertising a default route via eBGP. However, the PE is not installing the route in the VRF table. What is the most likely cause?
⚠ Common exam trap
Cisco often tests the distinction between configuring a BGP neighbor globally versus under a VRF address-family, tricking candidates into thinking that a neighbor statement under router bgp is sufficient for VRF route installation.
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 neighbor 10.1.1.1 is not configured under the address-family ipv4 vrf CUSTOMER
The BGP configuration shows that the neighbor 10.1.1.1 is configured under the BGP IPv4 unicast address-family, but not under the address-family ipv4 vrf CUSTOMER. For a VRF to install a route learned via eBGP from a CE router, the neighbor must be explicitly activated under the VRF address-family. Without this, the PE will receive the default route but will not place it into the VRF routing table.
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 redistribute connected command under the VRF is overwriting the default route
Why it's wrong here
Incorrect. Redistribution does not delete existing routes; it only injects connected routes.
- ✓
The neighbor 10.1.1.1 is not configured under the address-family ipv4 vrf CUSTOMER
Why this is correct
Correct. Without activating the neighbor under the VRF address-family, eBGP routes from CE are not imported into the VRF.
- ✗
The next-hop-self under the VRF address-family is not set
Why it's wrong here
Incorrect. Next-hop-self is used for advertisement to other PEs, not for route installation from CE.
- ✗
The default-information originate command is missing
Why it's wrong here
Incorrect. This command is used in OSPF to generate a default route; not relevant for BGP.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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