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Cisco IOS Cookbook, 2nd Edition by Ian Brown, Kevin Dooley

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Configuring Routing for a Low-Frequency Multicast Application

Problem

You have a multicast application where the servers send packets less frequently than the standard PIM timeout intervals.

Solution

PIM-SM is best suited to this type of application. The configurations of the RP and BSR or Auto-RP routers for this example are identical to those shown in Recipes 23.2 and 23.3. The differences appear on the other routers in the network. So this recipe shows only the configurations for these other routers:

Router1#configure terminal 
Enter configuration commands, one per line.  End with CNTL/Z.
Router1(config)#ip multicast-routing
Router1(config)#ip pim spt-threshold 10 group-list 15
Router1(config)#access-list 15 permit 239.5.5.55
Router1(config)#access-list 15 deny any
Router1(config)#interface FastEthernet0/0
Router1(config-if)#ip address 192.168.1.1 255.255.255.0
Router1(config-if)#ip pim sparse-dense-mode
Router1(config-if)#exit
Router1(config)#interface Serial1/0
Router1(config-if)#ip address 192.168.2.5 255.255.255.252
Router1(config-if)#ip pim sparse-mode
Router1(config-if)#end
Router1#

Discussion

Discussion of multicast applications usually focuses on high-bandwidth applications. But some multicast applications have the opposite behavior. For example, some news broadcast type applications allow message servers to send short messages to a large group of users. This sort of service might be used for administrative purposes (“the server is going down in five minutes”) or for business ...

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