Q: 3
Refer to the exhibit, which shows an ADVPN network
An administrator must configure an ADVPN using IBGP and EBGP to connect overlay network 1 with
2.
What two options must the administrator configure in BGP? (Choose two.)
An administrator must configure an ADVPN using IBGP and EBGP to connect overlay network 1 with
2.
What two options must the administrator configure in BGP? (Choose two.)Options
Discussion
Hmm, I think it should be C and B. IBGP multihop (C) sounds necessary since overlays might not be directly connected, and next-hop-self (B) is usually required. A could be a trap if we're not using eBGP across multiple hops. Happy to be corrected if I'm missing a nuance.
A is wrong, B and A. Needed for multihop eBGP and next-hop-self on iBGP in ADVPN.
Pretty sure A and B. Had something like this in a mock, those options cover eBGP multihop for non-direct peers and next-hop-self for iBGP which is needed in ADVPN topologies. Let me know if you think otherwise.
Not totally sold on A here. C, since ibgp-enforce-multihop looks more specific for ADVPN overlays.
I don’t think it's A and B. C and D.
Seen this in some practice labs, it's A and B from what the official Fortinet guide shows.
A and B tbh. You need ebgp-enforce-multihop for eBGP sessions that aren't directly connected, and next-hop-self to make the hub properly reflect routes in iBGP overlays. That's what I've seen in practice but open to correction if I've missed a nuance.
B , but only if every peer is iBGP. If the ADVPN mesh runs both IBGP and EBGP (like most full ADVPN overlays), you really need A too because EBGP won't come up otherwise over multi-hop. It's a sneaky requirement that throws people sometimes.
Is there any scenario where you'd need "set attribute-unchanged next-hop" (D) for ADVPN overlays connecting with both iBGP and eBGP? From what I've seen, A and B are usually enough for these designs. Always curious if folks have hit a weird edge case though.
A and B makes sense here. You'll see both listed in the official config guide for ADVPN with mixed iBGP/eBGP setups. Worth reviewing Fortinet's admin guide and lab scenarios if you're prepping for this part of the test, just to get a feel for how these commands work together.
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