When verifying Layer 3 MPLS VPN operations, which Cisco IOS XR show command is best used to verify that the PE router is receiving the routes from the CE router?

Question

Options

• Ashow route
• Bshow route vrf vrf-name
• Cshow bgp vpnv4 vrf vrf-name
• Dshow bgp vpnv4 unicast ip-prefix

• A
  8% (2)
• B
  85% (22)
• C
  4% (1)
• D
  4% (1)

Explanation

show route vrf vrf-name is correct because routes learned from a CE router are installed directly into the PE's VRF routing table - not the global table and not the BGP table - so inspecting the VRF-specific RIB is the direct way to confirm CE route reception via whatever protocol (eBGP, OSPF, static, etc.) connects the CE to the PE.

Option A (show route) is wrong because it displays the global (default) routing table; CE-learned routes live inside the VRF and will not appear there.

Options C and D both query the MP-BGP VPNv4 table, which reflects routes being exchanged between PE routers across the MPLS backbone - not routes arriving directly from the CE; using those commands would tell you about PE-to-PE distribution, not CE-to-PE reception.

Memory tip: Think of the flow: CE → PE VRF → BGP VPNv4 → remote PE VRF → remote CE. To verify the first arrow (CE to PE), check the VRF routing table with show route vrf; to verify the middle arrow (PE to PE), use the BGP VPNv4 commands.

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