ALCATEL LUCENT - Multicast Protocols Set 3

1.

Which of the following best describes the impact of an RP failure in a PIM ASM network?

All existing multicast traffic is stopped immediately, as the PIM ASM network must have an RP to

transmit the multicast traffic. The multicast traffic will be impacted, but not immediately, as multicast routers will not discover the RPfailure until the keep alive timer expires. No impact at all, as an RP is not required in a PIM ASM network. The traffic is not impacted if the multicast traffic flows have already been established, and the traffic flowdoes not involve the RP in the path.

2.

Which operation is performed by an interested PE upon receiving an MDT Join TLV?

The PE sends an (S, G) PIM Join with GRE encapsulation. The PE sends an (S, G) PIM Join with no encapsulation. The PE sends a (*, G) PIM Join with GRE encapsulation. The PE sends a (*, G) PIM Join with no encapsulation.

3.

In Draft Rosen, a PE router encapsulates customer multicast packets into provider packets. What source IP address is used for the provider packets?

The system IP address of the originating PE router. The source IP address of the customer packet. The outgoing interface IP address of the originating PE router. The source IP address specified in the MVPN configuration.

4.

What is the advantage of using the S-PMSI over the I-PMSI in Draft Rosen?

The S-PMSI reduces control plane overhead because the I-PMSI is no longer needed. The S-PMSI only forwards customer multicast traffic to PEs that have interested receivers. The S-PMSI is required because it is the initial multicast distribution tree for the MVPN. The S-PMSI encapsulates customer multicast traffic in an MPLS tunnel, which is more efficient than theGRE tunnel used by the I-PMSI.

5.

Which of the following is NOT a characteristic of Draft Rosen?

PIM in the VRF. PIM in the service provider's core network. GRE encapsulation for multicast data traffic. MPLS encapsulation for multicast data traffic.

6.

The Draft-Rosen S-PMSI address range is configured for 32 group addresses. What happens if there are more than 32 customer multicast flows that exceed the threshold configured for the MVPN?

Traffic for the 33rd multicast flow is dropped. Traffic for the 33rd multicast flow is transmitted on the I-PMSI. The source PE reassigns the S-PMSI with the smallest flow to the new multicast flow. Traffic for thesmaller flow is transmitted on the I-PMSI. The source PE re-uses an S-PMSI that is currently in use for the 33rd flow. Traffic for both flows is senton the same S-PMSI.

7.

In Draft Rosen, how does the PE process a PIM Join message received from its CE?

The PE maps the customer group address to a group address in the configured range and sends a PIM
Join for that group to the RP in the provider core. The PE propagates the PIM Join message to the RP in the provider core. The PE encapsulates the PIM Join message in GRE and sends it to other PEs via I-PMSI. The PE encapsulates the PIM Join message in GRE and sends it to other PEs via S-PMSI.

8.

Which of the following describes a purpose of MP-BGP as used in NG MVPN?

Building GRE tunnels to carry multicast traffic. Building MPLS tunnels to carry multicast traffic. Allowing a PE to discover the other PE routers in an MVPN. Exchanging multicast routing information between CE routers.

9.

Which of the following best describes the PMSI (provider multicast service interface) in an MVPN service?

The PMSI is the interface between the PEs and CEs in an MVPN service. The PMSI is an overlay broadcast network that interconnects all PEs in an MVPN service. The PMSI is the PIM-enabled interface between the PEs in an MVPN service. The PMSI is the GRE tunnel that carries customer multicast traffic across the service provider corenetwork.

10.

Which of the following fields is used in the PATH message to uniquely identify an S2L Sub-LSP?

P2MPID Tunnel ID Extended Tunnel ID Sub-Group ID

ALCATEL LUCENT - Multicast Protocols Set 3

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ALCATEL LUCENT - Multicast Protocols Set 3

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