Quick Answer
The answer is next-hop-self, which forces BGP to advertise the PE’s own IP address as the next-hop instead of preserving the original PE-CE interface address. In an MPLS L3VPN, the remote PE must forward VPN traffic directly to the local PE’s CE-facing interface, but BGP’s default behavior retains the original next-hop from the iBGP advertisement, which can break reachability. By applying next-hop-self on the PE, you override this and ensure the remote PE uses the correct loopback or peering address for label-switched forwarding. On the Cisco SPCOR 350-501 exam, this concept tests your understanding of BGP route propagation within the MPLS VPN control plane; a common trap is confusing next-hop-self with the disable-connected-check command, which only affects eBGP multihop. Remember the memory tip: “Self means myself—the PE advertises its own address so the remote PE knows exactly where to send the VPN traffic.”
This 350-501 practice question tests your understanding of networking. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A service provider is implementing MPLS L3VPN and needs to ensure that BGP route advertisement uses a specific next-hop. Which technique ensures BGP advertises the PE-CE next-hop instead of the PE-PE loopback?
Route-map with set next-hop
Why wrong: Possible but not the standard direct method.
next-hop-unchanged
Why wrong: This preserves the original next-hop, not desired.
next-hop-self
Sets the next-hop to the router's own address for iBGP advertisements.
Disable next-hop-check
Why wrong: Disabling check does not change the next-hop value.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
next-hop-self
In MPLS L3VPN, the PE-CE next-hop (the PE interface facing the CE) must be advertised to the remote PE so that the remote PE knows to forward traffic directly to the local PE's CE-facing interface. The `next-hop-self` command on the PE forces BGP to set the next-hop to the PE's own IP address (typically the loopback or the interface used for BGP peering), which overrides the default behavior of preserving the original next-hop. This ensures that the remote PE uses the correct next-hop for VPN traffic.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Route-map with set next-hop
Why it's wrong here
Possible but not the standard direct method.
next-hop-unchanged
Why it's wrong here
This preserves the original next-hop, not desired.
next-hop-self
Why this is correct
Sets the next-hop to the router's own address for iBGP advertisements.
Related concept
Read the scenario before looking for a memorised answer.
Disable next-hop-check
Why it's wrong here
Disabling check does not change the next-hop value.
Common exam traps
Cisco often tests the distinction between `next-hop-self` (used to force the PE's own address as the next-hop) and `next-hop-unchanged` (used to preserve the original next-hop in inter-AS scenarios), and candidates confuse these two commands.
Detailed technical explanation
Under the hood, when a PE receives a VPNv4 route from a CE via a VRF, the BGP process on the PE automatically sets the next-hop to the PE's own address (the loopback or the interface used for the BGP session) by default for routes redistributed into BGP. However, for directly connected CE routes, the next-hop may remain the CE's IP address unless `next-hop-self` is applied on the PE-CE BGP session. In a real-world scenario, if the PE-PE loopback is used as the next-hop, the remote PE would try to reach the loopback, which might not have a direct path to the CE, causing traffic black-holing.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A practitioner preparing for the 350-501 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
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FAQ
Networking — This question tests Networking — Read the scenario before looking for a memorised answer..
The correct answer is: next-hop-self — In MPLS L3VPN, the PE-CE next-hop (the PE interface facing the CE) must be advertised to the remote PE so that the remote PE knows to forward traffic directly to the local PE's CE-facing interface. The `next-hop-self` command on the PE forces BGP to set the next-hop to the PE's own IP address (typically the loopback or the interface used for BGP peering), which overrides the default behavior of preserving the original next-hop. This ensures that the remote PE uses the correct next-hop for VPN traffic.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 25, 2026
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