300-515 · Question #118
Which condition about MPLS-based IP VPNs must a network architect consider when developing a network solution for customers who run different routing protocols in their LANs?
The correct answer is C. If the PE-CE routing protocol is any protocol other than BGP, redistribution of local VPN routes. In an MPLS IP-VPN, routes learned from a CE via OSPF, EIGRP, RIP, or static must be redistributed by the PE into the MP-iBGP address family so they can be carried across the backbone to remote PEs. When PE–CE runs BGP, that BGP session itself carries the VPN routes into MP-iBGP…
Question
Which condition about MPLS-based IP VPNs must a network architect consider when developing a network solution for customers who run different routing protocols in their LANs?
Options
- AIf the PE-CE routing protocol is BGP, redistribution of local VPN routes into MP-IBGP is required
- BIf the BGP routing protocol is used between the PE and the CE, the asoverride attribute must be
- CIf the PE-CE routing protocol is any protocol other than BGP, redistribution of local VPN routes
- DIf the PE router is configured with BGP and the CE router is configured with RIP, the asoverride
How the community answered
(31 responses)- A19% (6)
- B10% (3)
- C65% (20)
- D6% (2)
Explanation
In an MPLS IP-VPN, routes learned from a CE via OSPF, EIGRP, RIP, or static must be redistributed by the PE into the MP-iBGP address family so they can be carried across the backbone to remote PEs. When PE–CE runs BGP, that BGP session itself carries the VPN routes into MP-iBGP and no additional redistribution is required.
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