Prerequisites: CCNP level skills.
Topology
Pic. 1 - Topology Diagram.
Note!
Routers and switches are already configured as per the topology diagram. All devices use OSPF area 0 as their routing protocol as well as multicast routing.
Task 1
Enable PIM Sparse Mode between R2 and R5 on FastEthernet link.Routers and switches are already configured as per the topology diagram. All devices use OSPF area 0 as their routing protocol as well as multicast routing.
Task 1
Task 2
Make sure that users on VLAN 26 can receive multicast traffic sent to 232.26.26.26 only from the source of 172.16.105.5 (R5 Loopback105). Verify your solution.
Solution
Task 1
R2 Configuration:
!
interface FastEthernet0/0
ip address 10.1.25.2 255.255.255.0
ip pim sparse-mode
speed 100
full-duplex
ip address 10.1.25.2 255.255.255.0
ip pim sparse-mode
speed 100
full-duplex
!
interface FastEthernet0/1
ip address 10.1.26.2 255.255.255.0
ip pim sparse-mode
ip igmp version 3
speed 100
full-duplex
ip address 10.1.26.2 255.255.255.0
ip pim sparse-mode
ip igmp version 3
speed 100
full-duplex
!
Note!
Since the Task 2 stipulates that Source Specific Multicast must be used, IGMP v3 hast to be configured on F0/1 interface.
R5 Configuration:
!
interface Loopback105
ip address 172.16.105.1 255.255.255.128
ip pim sparse-mode
!
interface Loopback105
ip address 172.16.105.1 255.255.255.128
ip pim sparse-mode
!
interface FastEthernet0/0
ip address 10.1.25.5 255.255.255.0
ip pim sparse-mode
speed 100
full-duplex
ip address 10.1.25.5 255.255.255.0
ip pim sparse-mode
speed 100
full-duplex
!
Task 2
Ensure that users on VLAN 26 can receive multicast traffic sent to 232.26.26.26 only from the source of 172.16.105.5 (R5 Loopback105). Verify your solution.
R2 and R5 Configuration:
!
ip pim ssm default
!
R6 Configuration:
!
interface FastEthernet0/0
ip address 10.1.26.6 255.255.255.0
ip igmp join-group 232.26.26.26 source 172.16.105.1
ip igmp version 3
speed 100
full-duplex
ip address 10.1.26.6 255.255.255.0
ip igmp join-group 232.26.26.26 source 172.16.105.1
ip igmp version 3
speed 100
full-duplex
!
Verification:
Pic. 2 - Mroute Entry on R2.
Pic. 3 - R2 and R3 Mroute Table.
Pic. 4 - Ping Test.
Apart from a classic multicast (Any Source Multicast), the Source Specific Multicast method allows clients to choose the source of multicast feed. It requires IGMP version 3 though. SSM builds SPT tree and does not require RP to operate. The command 'ip pim ssm' with the keyword 'default' uses the range 232.0.0.0/8 addresses. The syntax is as follows:
Pic. 5 - IP PIM SSM Command.
