350-501 MPLS and Segment Routing Practice Question
In an MPLS L3VPN network, a route reflector (RR) is used to distribute VPNv4 routes between PE routers. After a new PE router (PE4) is added, some VPN routes are not being received by other PEs. Which TWO actions should be investigated to resolve the issue? (Choose two.)
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
✓
Ensure the VRF route-target import/export values are correctly configured on the new PE.
The new PE must have matching VRF route-target import/export values to receive and advertise VPN routes. Option C is correct because a BGP VPNv4 neighbor relationship between the new PE and the RR is necessary for VPNv4 route exchange. Option B is incorrect: OSPF as an additional IGP is not required for VPN route distribution. Option D is incorrect: while physical connectivity and IGP adjacency are prerequisites, the specific issue with missing VPN routes points to BGP session or RT misconfiguration. Option E is incorrect: a route refresh does not fix missing route-target or BGP session problems.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Ensure the VRF route-target import/export values are correctly configured on the new PE.
Why this is correct
Mismatched RTs prevent routes from being imported into the VRF.
- ✗
Configure OSPF as an additional IGP to redistribute VPN routes.
Why it's wrong here
OSPF is not used for VPN route distribution; BGP is used.
- ✓
Verify that BGP VPNv4 neighbor relationship is established between the new PE and the RR.
Why this is correct
Without an established MP-BGP session, routes cannot be exchanged.
- ✗
Check physical connectivity and IGP adjacency between the new PE and the RR.
Why it's wrong here
Physical connectivity is assumed; the issue is at the BGP layer.
- ✗
Issue a 'clear ip bgp * refresh' on the RR.
Why it's wrong here
Route refresh only requests a resend, but does not fix missing policies.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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