350-501 Services Practice Question
Exhibit
Refer to the exhibit.
PE1# show ip bgp vpnv4 vrf Customer-B 192.168.10.0
BGP routing table entry for 192.168.10.0/24, version 12
Paths: (1 available, best #1, table Customer-B)
Not advertised to any peer
Refresh Epoch 1
Local, imported path from 10.1.1.2 (via vrf Customer-B)
RD: 65000:100
Origin IGP, metric 0, localpref 100, valid, internal, best
Extended Community: RT:65000:200
Originator: 10.1.1.2, Cluster list: 10.2.2.2
mpls labels in/out: 16023/16030Given the output, which configuration mismatch would prevent a remote PE in the same VPN from installing this route into its VRF?
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 remote PE has an import RT that does not include RT:65000:200.
The route carries RT:65000:200. For a remote PE to install this route into its VRF, the VRF must have an import RT that includes RT:65000:200. If the remote PE's VRF imports a different RT (e.g., RT:65000:100), the route will not be installed. Option B is incorrect because different route distinguishers (RDs) do not prevent route installation as long as the Route Target matches. Option C is incorrect because MPLS VPN does not filter routes based on BGP AS-path by default; moreover, the AS-path containing AS 65000 is not a typical filter in this context. Option D is incorrect because the next-hop 10.1.1.2 is reachable in the remote PE's global routing table, as indicated by the output (or assumed reachable).
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 remote PE has an import RT that does not include RT:65000:200.
Why this is correct
Correct: The route's RT must match an import RT on the remote VRF for the route to be installed.
- ✗
The remote PE uses a different route distinguisher for its VRF.
Why it's wrong here
Incorrect: Different RDs do not block route import; RT matching is what controls import.
- ✗
The remote PE filters routes based on BGP AS-path containing AS 65000.
Why it's wrong here
Incorrect: AS-path filtering is not typical in MPLS VPN; RT import is the standard mechanism.
- ✗
The next-hop 10.1.1.2 is not reachable in the remote PE's global routing table.
Why it's wrong here
Incorrect: A missing next-hop would affect BGP path selection, but the route would still be learned; the issue is with RT import.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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