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CCNP SP MPLS FAQ: IPv6 over MPLS

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CCNP SP MPLS FAQ: IPv6 over MPLS

Q1. Name three reasons to have a new IP protocol.

Answer: Following are some of the reasons for having a new IP protocol:

  • Bigger addresses
  • More streamlined and more efficient IP header
  • Fixed IP header size
  • Flow Label field

Q2. How many bits does an IPv6 address have?

Answer: An IPv6 address has 128 bits.

Q3. What happened to IP protocol version 5?

Answer: IPv5 was experimental and was dropped.

Q4. Name the five ways a service provider can carry IPv6 packets across the backbone network.

Answer: A service provider can carry IPv6 packets across the backbone network in these ways.

  • Run a dual stack (IPv4 and IPv6) on the backbone routers.
  • Run AToM and transport IPv6 packets on pseudowires.
  • Use the MPLS VPN for IPv4 solution with the CE routers running dual stack, and carry IPv6 over IPv4 tunnels.
  • Use 6PE.
  • Use 6VPE.

Q5. What is the routing protocol OSPF for IPv6 also called?

Answer: OSPFv3 is another name for the routing protocol OSPF for IPv6.

Q6. Which field in the IPv6 header is the equivalent to the Type of Service field in the IPv4 header for the Differentiated Services (DiffServ) model?

Answer: The Traffic Class field in the IPv6 header is equivalent to the Type of Service field in the IPv4 header for the Differentiated Services (DiffServ) model.

Q7. What routing protocols are supported on the PE-CE links of the 6PE solution?

Answer: All IPv6 unicast routing protocols are supported on the PE-CE links of the 6PE solution.

Q8. How many labels are put on top of the IPv6 packet in a 6PE network?

Answer: Two labels are put on top of the IPv6 packet in a 6PE network.

Q9. How can you quickly see the difference between the 6PE and 6VPE solution by looking at the configuration of a PE router?

Answer: The configuration of 6VPE shows VRFs for IPv6 and an address family vpnv6 for BGP on the PE router.

Q10. Why are the 6PE and 6VPE solutions the best ones for carrying IPv6 traffic across an MPLS backbone?

Answer: The IPv6 packets are transported across the MPLS backbone natively. This means that there is no added Layer 2 frame header or IPv4 header.
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