PIM Sparse-Dense Mode

PIM Sparse-Dense mode is a hybrid of the Sparse and Dense mode operations.the router will forward traffic for both sparse and dense multicast groups out of its configured interface. A “sparse” multicast group is the one that has an RP defined. Some routers haven’t received Auto-RP announcements, these routers will switch all groups to dense-mode and start flooding the network with multicast traffic.



R2#
ip multicast-routing
!
interface FastEthernet0/0
 ip address 12.1.1.2 255.255.255.0
 ip pim sparse-dense-mode
 duplex auto
 speed auto
end
!
interface FastEthernet0/1
 ip address 24.1.1.2 255.255.255.0
 ip pim sparse-dense-mode
 duplex auto
 speed auto
end
 
R1(config)#
ip multicast-routing
!
interface FastEthernet0/0
 ip address 12.1.1.1 255.255.255.0
 ip pim sparse-dense-mode
 duplex auto
 speed auto
end

R4#
ip multicast-routing
!
interface FastEthernet0/0
 ip address 24.1.1.4 255.255.255.0
 ip pim sparse-dense-mode
 duplex auto
 speed auto
!
interface FastEthernet0/1
 ip address 47.1.1.4 255.255.255.0
 ip pim sparse-dense-mode
 duplex auto
 speed auto
!

R7#
!
interface FastEthernet0/0
 ip address 47.1.1.7 255.255.255.0
 ip pim sparse-dense-mode
 ip igmp join-group 224.7.7.7
 duplex auto
 speed auto
!