PIM-SM configuration example
The following is a sample topology diagram for a PIM-SM configuration.
Multicast +-----------+ +-----------+
Source | |1/1/1 1/1/1 |1/1/2
1/1/2 Router1 +------------------+ Router2 +-------------+
+--------| |CBSR | | IGMP
| |CRP | | Clients
+-----------+ +-----------+
In this topology, the multicast source is connected to Router1 and Clients are connected to Router2.
Router1 and Router2 are directly connected so you can verify the neighborship using the
show ip pim neighbor
command.
Secondly Router1 interface 1/1/1 is the BSR candidate and RP candidate in this domain. This information needs to be propagated across the network and needs to be consistent on all routers in the topology. To verify this, use the
show ip pim rp-set command for group mapping information and the
show ip pim bsr command for elected BSR information. If they show inconsistent information, you could see possible multicast outages.
If the joins are seen by the routers before the streams can flow, both routes will display those requests in the
show ip pim pending command output.
Once the multicast source streams start to flow, each router in the path will add multicast router (mroute) entries, which can be verified using the
show ip mroute command.
The output of the following
show running-config command shows an example of PIM-SM configuration.
switch# show running-config
Current configuration:
!
!
!
!
!
Router1
---------------
router ospf 1
redistribute connected
area 0.0.0.0
router pim
enable
bsr-candidate source-ip-interface 1/1/1
rp-candidate source-ip-interface 1/1/1
rp-candidate group-prefix 224.0.0.0/4
interface 1/1/1
ip address 10.10.10.1/24
ip ospf 1 area 0.0.0.0
ip pim-sparse enable
interface 1/1/2
ip address 20.20.20.1/24
ip pim-sparse enable
Router2
---------------
router ospf 1
redistribute connected
area 0.0.0.0
router pim
enable
interface 1/1/1
ip address 10.10.10.2/24
ip ospf 1 area 0.0.0.0
ip pim-sparse enable
interface 1/1/2
ip address 30.30.30.1/24
ip pim-sparse enable
ip igmp enable