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Chapter 10
Configuring Multicast
Auto-RP information or another statically configured RP in order to work
properly:
!
no ip classless
ip route 0.0.0.0 0.0.0.0 172.16.22.2
ip pim rp-address 172.16.1.253 50 override
!
access-list 50 permit 224.0.0.0 0.255.255.255
access-list 50 deny any
!
Auto-RP Configuration
There are also two procedures that can be used to enable Auto-RP; which
one you use depends on the state of your multicast network. If you are begin-
ning a new deployment, it isn't necessary to create a default RP. If you are
modifying an existing multicast network, you will need to designate a default
RP router in the network.
Here is a list of configuration tasks that must be completed to successfully
implement Auto-RP in a multicast network:
Designate a default RP (only when modifying an existing multicast
network).
Advertise each RP and the multicast groups associated with the RP.
Enable an RP Mapping Agent.
As you can see the list is short and simple. Now that you know what has to
be done, let's discuss each step individually.
Designate a Default RP
This step is somewhat tricky, not so much because the configuration is
tricky, but because of the decision regarding when to execute the step. The
only time you need to designate a default RP is when you are running sparse
mode only on any of your interfaces in an existing multicast network. If
you are using sparse-dense mode, as suggested, you will not need to execute
this step.
This step is executed as described in "Manual RP Configuration" earlier
in this chapter. The default RP becomes the statically mapped RP on all of
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