9-5 - Use 6VPE to Deploy IPv6 Connectivity over MPLS Environment

Question 1

ISPs that offer MPLS VPNs for IPv4 can use Cisco 6VPE to add IPv6 services. This approach has these benefits:

Answer 1

• There is no modification on the MPLS core.
• Cisco 6VPE supports both IPv4 and IPv6 VPNs concurrently on the same interfaces.
• Configuration and operation of IPv6 VPNs are the same as for IPv4 VPNs.

Question 2

T/F: A VPN is said to be an IPv6 VPN when a CE router turns on native IPv6 over an interface or subinterface to the PE router.

Answer 2

True

Question 3

T/F: Cisco 6VPE adds IPv6 VPN capability to Cisco 6PE and enables an ISP to deliver services that are similar to IPv4.

Answer 3

True

Question 4

T/F: As with IPv4 VPN route distribution, BGP and its extensions distribute routes from an IPv6 VPN site to all other Cisco 6VPE routers that connect to a site of the same IPv6 VPN.

Answer 4

True

Question 5

T/F: MP-BGP allows generic operations over only IPv4.

Answer 5

False. MP-BGP allows generic operations over both IPv4 and IPv6. For example, MP-BGP defines an IPv6 VPN address family and describes the route distribution and MPLS tunnel selection.

Question 6

You must complete these prerequisite steps before you configure the 6VPE feature:

Answer 6

• Loopback interface must be configured with /32 host addresses on the PE routers.
• MPLS LDP must be enabled on the interfaces in the core.
• An IGP must be configured in the backbone.

Question 7

The configuration steps for 6VPE include the following:

Answer 7

• Configure MP-BGP for VPNv6 route exchange.
• Define IPv6-enabled VRFs for customer sites.
• Assign customer interfaces to VRFs.
• Configure the customer VRF (PE-CE) IPv6 routing.
• Redistribute routing information:
  *Customer routes into MP-BGP.
  *MP-BGP to customer IGP.

Question 8

IOS-XR Commands:
- show bgp vpnv6 unicast vrf <vrf-name>
- show bgp vpnv6 unicast vrf <vrf-name> <ipv6></ipv6></vrf-name></vrf-name>

Answer 8

show VPNv6 prefixes and info

Question 9

IOS-XR Commands:
traceroute <ipv6></ipv6>

Answer 9

traceroute to an IPv6 host

Question 10

What is true about using 6VPE?

A. Packet forwarding in a 6VPE environment does not follow the same scheme as in IPv4 MPLS VPNs.
B. In a BGP MPLS VPN, OSPF forwards packets over the backbone.
C. A VPN is said to be an IPv6 VPN when a CE router disables native IPv6 over an interface or subinterface to the PE router.
D. Cisco 6VPE supports both IPv4 and IPv6 VPNs concurrently on the same interfaces.

Answer 10

D