350-501 Networking Practice Question
A network administrator is configuring a Cisco ASR 9000 router for MPLS L3VPN. The PE receives customer routes via eBGP from the CE. Which command is required to redistribute these routes into the VPNv4 BGP table on the PE?
⚠ Common exam trap
Cisco often tests the distinction between configuring BGP within a VRF (for CE-PE eBGP) and enabling the VPNv4 address family to propagate those routes across the MPLS core, leading candidates to mistakenly think that simply configuring 'address-family ipv4 vrf CUSTOMER' is sufficient for VPNv4 redistribution.
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
✓
Configure 'address-family ipv4 unicast' under the VRF configuration and then 'address-family vpnv4 unicast' under the BGP process.
In MPLS L3VPN, customer routes learned via eBGP from the CE must be placed into the VRF's IPv4 unicast table first, and then the 'address-family vpnv4 unicast' under BGP is required to redistribute those VRF routes into the VPNv4 BGP table, which carries the route with its route distinguisher (RD) and extended community. This two-step process ensures the PE can advertise the route as a VPNv4 prefix to other PEs via MP-BGP.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Configure 'address-family ipv4 unicast' under the VRF configuration and then 'address-family vpnv4 unicast' under the BGP process.
Why this is correct
The VRF address-family ipv4 unicast imports routes into the VRF, and the VPNv4 address-family enables VPNv4 BGP to carry these routes.
- ✗
Configure 'address-family ipv4 vrf CUSTOMER' under the BGP process and activate the neighbor.
Why it's wrong here
This is part of the configuration, but does not alone cause redistribution into VPNv4.
- ✗
Enter 'vrf CUSTOMER' in the BGP process and then 'address-family ipv4 unicast' under the VRF.
Why it's wrong here
This configures the VRF in BGP but does not automatically import routes into VPNv4.
- ✗
Enter 'redistribute bgp 100' under the VRF's OSPF or static route configuration.
Why it's wrong here
Redistribution is not needed; BGP routes are learned directly via BGP peering.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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