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Configuring Multicast Source Discovery Protocol
MSDP Configuration Examples
IPC-488
Cisco IOS IP Configuration Guide
MSDP Configuration Examples
This section contains the following MSDP configurations examples:
• Default MSDP Peer
• Logical RP
Default MSDP Peer
The following example is a partial configuration of Router A and Router C in Figure 79. Each of these
ISPs may have more than one customer like the customer in Figure 79 that use default peering (no BGP
or MBGP). In that case, they may have similar configurations. That is, they will only accept SAs from a
default peer if the SA is permitted by the corresponding prefix list.
Router A Configuration
ip msdp default-peer 10.1.1.1
ip msdp default-peer 10.1.1.1 prefix-list site-a ge 32
ip prefix-list site-b permit 10.0.0.0/8
Router C Configuration
ip msdp default-peer 10.1.1.1 prefix-list site-a ge 32
ip prefix-list site-b permit 10.0.0.0/8
Logical RP
The following example configures a logical RP using an MSDP mesh group. The four routers that are
logical RPs are RouterA, RouterB, RouterC, and RouterD. RouterE is an MSDP border router that is not
an RP. Figure 80 illustrates the logical RP environment in this example; the configurations for routers
A, B, and E follow the figure.
It is important to note the use of the loopback interface and how those host routes are advertised in Open
Shortest Path First (OSPF). It is also important to carefully choose the OSPF router ID loopback so the
ID does not use the logical RP address.
In this example, all the logical RPs are on the same LAN, but this situation is not typical. The host route
for the RP address is advertised throughout the domain and each PIM designated router (DR) in the
domain joins to the closest RP. The RPs share (S, G) information with each other by sending SA
messages. Each logical RP must use a separate originator ID.
Note There are two MSDP mesh groups on RouterA. The routes for the loopback interfaces are in OSPF.
Loopback 0 is the Router ID and is used as the connect source/update source for MBGP/MSDP.
Loopback 10 is the same on all routers in the example.
All networks are 171.69.0.0. The RP address is 10.10.10.10 on Loopback 10 on all RPs. BGP
connections are 192.168.1.x on Loopback 0. Loopback 0 is put into BGP with network 192.168.1.3 mask
255.255.255.255 NLRI unicast multicast.