5-4 - Implement Extranet MVPN

Question 1

T/F: With an extranet MVPN, multicast clients that are external to the organization are allowed to access the intranet. The external users may be business partners, customers, or suppliers to the organization.

Answer 1

True

Question 2

T/F: An MVPN extranet allows service providers to distribute multicast content that originates from an enterprise site to other enterprise sites or between different VRF configurations.

Answer 2

True

Question 3

Components of an Extranet MVPN

Answer 3

MVRF instance: An MVRF is a multicast-enabled VRF. A VRF consists of an IP routing table, a derived forwarding table, a set of interfaces that use the forwarding table, and a set of rules and routing protocols that determine what goes into the forwarding table. In general, a VRF includes the routing information that defines a customer VPN site that attaches to a PE router.

Source MVRF: An MVRF that can reach the source through a directly connected CE router.

Receiver MVRF: An MVRF to which receivers are connected through one or more CE devices.

Source PE: A PE router with a multicast source behind a directly connected CE router.

Receiver PE: A PE router with one or more interested receivers behind a directly connected CE router.

Question 4

T/F: To provide support for extranet MVPN services, you must configure a differnt default MDT group in the source and receiver MVRF.

Answer 4

False. To provide support for extranet MVPN services, you must configure the same default MDT group in the source and receiver MVRF.

Question 5

Describe multicast VPN extranet support.

Answer 5

• the receiver and source MVRF multicast route (mroute) entries are linked
• the RPF check relies on unicast routing information to determine the interface through which the source is reachable. This interface is used as the RPF interface.

Question 6

Two configuration options are available to provide extranet MVPN services. What are they?

Answer 6

• configure the receiver MVRF on the source PE router
  For each extranet site, you configure an extra MVRF on the source PE router, which has the same default MDT group as the receiver MVRF, if you did not configure the MVRF on the source PE.
  Traffic for every MVRF is being transported by different MDT groups (the multicast groups used by PE routers to exchange PIM control messages and multicast traffic).
  In the receiver MVRF configuration, you configure the same unicast routing policy on the source and receiver PE routers to import routes from the source MVRF to the receiver MVRF.
• configure the source MVRF on the receiver PE router
  On a receiver PE router that has one or more interested receivers in an extranet site behind a directly connected CE router, configure an extra MVRF that has the same default MDT group as the site that connects to the multicast source, if you do not configure the MVRF.
  On the receiver PE router, you configure the same unicast routing policy to import routes from the source MVRF to the receiver MVRF.

Question 7

What is Multicast VPN Extranet VRF Select?

Answer 7

• provides the capability for RPF lookups to perform to the same source address in different VRFs by using the group address as the VRF selector.
• enables service providers to distribute content streams that originate from different MVPNs and redistribute them from there.

Question 8

Command:
ip multicast rpf select

Answer 8

• Configure RPF lookups that originate in a receiver MVRF or in the global oruting table to resolve in a source MVRF or in the global routing table based on group address
• Use ACLs to define the groups to apply to group-based VRF selection policies

Question 9

What is true about implementing extranet Layer 3 multicast VPNs?

A. With an extranet MVPN, multicast clients, which are external to the organization, are not allowed to access the intranet.

B. An MVPN extranet allows service providers to distribute multicast content that originates from an enterprise site to other enterprise sites or between different VRFs.

C. With the multicast VPN extranet support feature, the receiver and source MVRF multicast route entries are no longer linked.

D. The Multicast VPN Extranet Support feature extends this offer to include unicast connectivity to the extranet community of interest.

Answer 9

B