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300-515 · Question #136

SIMULATION 2 Guidelines This is a lab item in which tasks will be performed on virtual devices. Refer to the Tasks tab to view the tasks for this lab item Refer to the Topology tab to access the…

The correct answer is D. The PE redistributes the OSPFv3 into MP-BGP in the VPNv4 address family. Note: The provided answer key appears to contain an error. Marking D as correct conflicts with the scenario itself - here's why this matters: Why D is technically incorrect (and likely a mistake in the answer key): VPNv4 carries IPv4 prefixes with Route Distinguishers. Since…

IPv6 VPNs

Question

SIMULATION 2 Guidelines This is a lab item in which tasks will be performed on virtual devices. Refer to the Tasks tab to view the tasks for this lab item Refer to the Topology tab to access the device console(s) and perform the tasks. Console access is available for all required devices by clicking the device icon or using the tab(s) above the console window. All necessary pre-configurations have been applied. Do not remove any existing configurations from the devices, only those necessary to make the appropriate changes required to fulfill the listed tasks. Do not change the enable password or hostname for any device. Save your configurations to NVRAM before moving to the next item. Click Next at the bottom of the screen to submit this lab and move to the next question. When Next is clicked, the lab closes and cannot be reopened. Tasks CE1 and CE2 are IPv6 Customer Premise Equipment of two customers that communicate with each other through the MPLS L3VPN core comprising Provide Edge PE1, PE2, and route- reflector RR. Perform the below configuration and verification tasks as noted. 1. Modify the PEs to allow the CEs to communicate with each other over their Loopback 0 addresses. 2. Modify PE1 to receive CE2's loopback1 address and advertise to CE1. Initial configuration with IPv6 addressing has been completed. Do not change the configurations except to fulfill the abovementioned tasks. Apply the solution with the minimum configuration. Topology PE1 CE1 CE2 Answer: On PE1 and PE2: 1. Under address-family vpnv6 neighbor 10.3.3.3 activate Brings up the MP-BGP session to RR for IPv6 routes. neighbor 10.3.3.3 send-community extended Ensures the Route Distinguisher/RT are carried so remote PEs know which VRF to install these routes into. 2. Under address-family ipv6 vrf ABC neighbor <CE-link-IPv6> activate (If not already present) activates the PE-CE IPv6 BGP neighbor so the PE will receive the CE's Loopback-0/32. redistribute connected Picks up the CE's directly-connected loopback subnet on the PE and advertises it into the MP- BGP IPv6‐VPN (vpnv6) table.

Exhibits

300-515 question #136 exhibit 1
300-515 question #136 exhibit 2
300-515 question #136 exhibit 3
300-515 question #136 exhibit 4
300-515 question #136 exhibit 5
300-515 question #136 exhibit 6

Options

  • AA 6to4 tunnel is needed to transmit IPv6 traffic between customer sites over an MPLS SP core.
  • BThe PE redistributes the OSPFv3 into MP-BGP in the VPNv6 address family.
  • CA GRE tunnel is needed to transmit IPv6 traffic between customer sites over an MPLS SP core.
  • DThe PE redistributes the OSPFv3 into MP-BGP in the VPNv4 address family.

How the community answered

(42 responses)
  • A
    14% (6)
  • B
    7% (3)
  • C
    2% (1)
  • D
    76% (32)

Explanation

Note: The provided answer key appears to contain an error. Marking D as correct conflicts with the scenario itself - here's why this matters:

Why D is technically incorrect (and likely a mistake in the answer key): VPNv4 carries IPv4 prefixes with Route Distinguishers. Since CE1 and CE2 are IPv6 devices, the correct MP-BGP address family to use is VPNv6, not VPNv4. Applying VPNv4 here would not transport IPv6 customer routes across the MPLS core.

Why the other options are wrong:

  • A (6to4 tunnel): MPLS L3VPN natively supports IPv6 via 6VPE (IPv6 Provider Edge); no 6to4 tunnel is needed or appropriate.
  • B: This is actually the closest to correct in principle - the PE does redistribute into MP-BGP under the VPNv6 address family - but the solution uses redistribute connected (not OSPFv3), and the routing protocol between PE and CE here is BGP, not OSPF.
  • C (GRE tunnel): Same flaw as A - MPLS L3VPN eliminates the need for any overlay tunnel for customer IPv6 traffic.

The real takeaway for exam takers: For IPv6 MPLS L3VPN (6VPE), PEs use the VPNv6 address family in MP-BGP, activate IPv6 BGP neighbors under the VRF, and redistribute connected or CE routes. Memory tip: "IPv6 customers → VPNv6 address family" - the IP version always matches (IPv4 → VPNv4, IPv6 → VPNv6).

If this is from a practice exam, flag this question as likely containing an answer key error.

Topics

#OSPFv3 PE-CE#VPNv6 redistribution#IPv6 VPN#simulation

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