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Section 9: Multicast (4 Points)

  • Enable your network to allow hosts on VLAN4 to receive and send multicast traffic from and to VLAN2; only perform configuration on R5 and R6 using PIM sparse dense mode.

This question simply requires basic multicast setup between R5 and R6 using PIM sparse-dense-mode. If you have configured this correctly as shown in Example 1-65 and Example 1-66, you have scored 1 point.

Example 1-65 R5 Multicast Configuration

ip multicast-routing
!
interface FastEthernet0/0
 ip pim sparse-dense-mode
!
interface ATM3/0
 ip pim sparse-dense-mode

Example 1-66 R6 Multicast Configuration

ip multicast-routing
!
interface FastEthernet0/0
 ip pim sparse-dense-mode
!
interface ATM1/0.99 point-to-point
 ip pim sparse-dense-mode

  • Configure R6 to respond to pings from R5 to the multicast address of 224.4.4.4.

Configure ip igmp join-group 224.4.4.4 under R6 fastEthernet0/0. If you have configured this correctly, you have scored 1 point.

  • Do not allow R5 to fully participate in the PIM process by not allowing it to become a neighbor but do allow any IGMP messages generated by hosts on VLAN4 to be received by R6.

This question requires Stub Multicast Routing. This allows you to configure remote/stub routers as IGMP proxy agents. The stub router does not fully participating in PIM and, hence, is not seen as a PIM neighbor; access-list 11 blocks the neighbor. If you have configured this correctly as in Example 1-67, you have scored 2 points.

Example 1-67 R6 Stub Multicast Configuration

interface ATM1/0.99 point-to-point
 ip pim neighbor-filter 11
!
access-list 11 deny   10.99.99.2
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