Answers to Review Questions 377

Answers to Review Questions

1.B. To place a static route into MP-BGP, you redistribute it with the redistribute static command.

2.A. The outgoing interface is mandatory when configuring a static VRF route.

3.B. The outgoing interface is mandatory when configuring a static VRF route, but the next hop IP address is optional.

4.B. To configure a static VRF route, use the ip route vrf vpn_name command.

5.A. To configure a standard static route, use the ip route command.

6.C. To redistribute interface subnets into MP-BGP, use the redistribute connected command.

7.C. RIPv2, E-BGP, and OSPF are supported PE-CE routing protocols. EIGRP is not.

8.B. E-BGP neighbors must be activated.

9.B. Customers run standard E-BGP with a PE router and therefore do not need an IOS upgrade.

10.B. AS-override is used to allow a client to reuse the same AS number across multiple sites.

11.C. Without AS-override and where the same AS number is being reused across multiple customer sites, the AS path appears to be a routing loop.

12.A. To configure AS-override, use the neighbor ip_address as-override command.

13.B. E-BGP routes do not need to be redistributed into MP-BGP.

14.C. The maximum routes feature limits the number of routes allowed into a VRF.

15.B. The first option after the maximum-routes command is the maximum number of routes allowed in the VRF.

16.A. The default action of the maximum-routes command is to drop new routes after the maximum number of routes has been exceeded.

378Chapter 8 Advanced MPLS Topics

17.A. Two sites connected only to each other is usually a simple MPLS VPN.

18.B. A site that is part of more than one VPN is an overlay MPLS VPN.

19.C. A Central Services MPLS VPN topology is characterized by a central site seeing all subscribing sites, and the subscribing sites seeing the central site but not each other.

20.C. The maximum routes feature limits the number of routes allowed into a VRF and therefore limits the number of routes ending up in the service provider backbone.

Appendix Challenge Labs

A