55. PIM Sparse Mode statically specifies RP for Multicast configuration experiment
1. Introduction to PIM Sparse Mode
2. Experimental topology
3. Basic configuration
R1 configuration
Interface Serial0/1
Ip address 12.1.1.1 255.255.255.0
Interface Serial0/2
Ip address 14.1.1.1 255.255.255.0
Interface FastEthernet1/0
Ip address 13.1.1.1 255.255.255.0
Router ospf 110
Router-id 1.1.1.1
Network 12.1.1.0 0.0.0.255 area 0
Network 13.1.1.0 0.0.0.255 area 0
Network 14.1.1.0 0.0.0.255 area 0
R2 configuration
Interface Serial0/0
Ip address 25.1.1.2 255.255.255.0
Interface Serial0/1
Ip address 12.1.1.2 255.255.255.0
Router ospf 110
Router-id 2.2.2.2
Network 12.1.1.0 0.0.0.255 area 0
Default-information originate always
R3 configuration
Interface FastEthernet1/0
Ip address 13.1.1.3 255.255.255.0
Router ospf 110
Router-id 3.3.3.3
Network 13.1.1.0 0.0.0.255 area 0
R4 configuration
Interface Serial0/0
Ip address 46.1.1.4 255.255.255.0
Interface Serial0/2
Ip address 14.1.1.4 255.255.255.0
Router ospf 110
Router-id 4.4.4.4
Network 14.1.1.0 0.0.0.255 area 0
R5 configuration
Interface Serial0/0
Ip address 25.1.1.5 255.255.255.0
R6 configuration
Interface Serial0/0
Ip address 46.1.1.6 255.255.255.0
No ip routing
Ip default-gateway 46.1.1.4
4. Configure PIM Sparse Mode
R1 configuration
Ip multicast-routing
Interface Serial0/1
Ip pim sparse-mode
Interface Serial0/2
Ip pim sparse-mode
Interface FastEthernet1/0
Ip pim sparse-mode
R2 configuration
Ip multicast-routing
Interface Serial0/0
Ip pim sparse-mode
Interface Serial0/1
Ip pim sparse-mode
R3 configuration
Ip multicast-routing
Interface FastEthernet1/0
Ip pim sparse-mode
R4 configuration
Ip multicast-routing
Interface Serial0/0
Ip pim sparse-mode
Interface Serial0/2
Ip pim sparse-mode
R6 configuration
Interface Serial0/0
Ip igmp join-group 224.1.1.1
5. Static election RP
Static election RP requires a rendezvous point RP to be specified on each PIM router, and the rendezvous point RP elected by this method has no backup redundancy.
R1 configuration
Interface Loopback0
Ip address 1.1.1.1 255.255.255.0
Router ospf 110
Network 1.1.1.0 0.0.0.255 area 0
Ip pim rp-address 1.1.1.1
R2 configuration
Ip pim rp-address 1.1.1.1
R3 configuration
Ip pim rp-address 1.1.1.1
R4 configuration
Ip pim rp-address 1.1.1.1
6. Testing
Before the source sends multicast traffic, a RPT tree is formed between R1 and R4, and no tree is formed between R2 and R1.
The source encapsulates the multicast traffic into a unicast and sends it to the rendezvous point RP. Because there is a receiver under the rendezvous point RP, the rendezvous point will unencapsulate the unicast sent by the source and send the multicast traffic to the receiver.
The receiver then sends a Join message to the First Hop router, and eventually generates a SPT tree between the First Hop router and the Last Hop router.
7. Turn off automatic conversion of SwitchOver
To turn off the automatic translation SwitchOver, simply configure it in the global configuration mode of the Last Hop router.
Ip pim spt-threshold infinity
