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Configuring IP Multicast Routing
IP Multicast Configuration Examples
IPC-450
Cisco IOS IP Configuration Guide
ip pim sparse-dense-mode
!
router ospf 1
network 172.21.24.8 0.0.0.7 area 1
network 172.21.24.16 0.0.0.7 area 1
!
ip pim bsr-candidate Ethernet2 30 10
ip pim rp-candidate Ethernet2 group-list 5
access-list 5 permit 239.255.2.0 0.0.0.255
Border Router Configuration Example
The following example shows how to configure a border router in a PIM-SM domain on Ethernet
interface 1. The ip pim bsr-border interface configuration command will prevent BSR messages from
being sent or received through the interface. The ip multicast boundary interface configuration
command and access list 1 will prevent Auto-RP messages from being sent or received through the
interface.
version 12.0
!
ip multicast-routing
!
interface Ethernet0
ip address 171.69.62.35 255.255.255.240
!
interface Ethernet1
ip address 172.21.24.18 255.255.255.248
ip pim sparse-dense-mode
ip pim bsr-border
ip multicast boundary 1
!
! Access list to deny Auto-RP (224.0.1.39, 224.0.1.40) and
! all administrately scoped multicast groups (239.X.X.X)
access-list 1 deny 239.0.0.0 0.255.255.255
access-list 1 deny 224.0.1.39
access-list 1 deny 224.0.1.40
access-list 1 permit 224.0.0.0 15.255.255.255
RFC 2362 Interoperable Candidate RP Example
When Cisco and non-Cisco routers are being operated in a single PIM domain with PIM Version 2 BSR,
care must be taken when configuring candidate RPs because the Cisco IOS implementation of the BSR
RP selection is not fully compatible with RFC 2362.
RFC 2362 specifies that the BSR RP be selected as follows (RFC 2362, 3.7):
Step 1 Select the candidate RP with the highest priority (lowest configured priority value).
Step 2 If there is a tie in the priority level, select the candidate RP with the highest hash function value.
Step 3 If there is a tie in the hash function value, select the candidate RP with the highest IP address.
Cisco routers always select the candidate RP based on the longest match on the announced group address
prefix before selecting an RP based on priority, hash function, or IP address.