Example for Configuring Multicast Multi-Instance on an L3VPN

This section provides an example for configuring multicast multi-instance on an L3VPN.

Networking Requirements

On the network shown in Figure 1, CE1 and CE3 belong to VPN1; CE2 and CE4 belong to VPN2. Each PE connects to both VPN1 and VPN2. To separate multicast traffic between the VPN instances and implement multi-instance, configure a GRE tunnel between the PEs.

Figure 1 Configuring multicast multi-instance on an L3VPN

In Figure 1, GE1 represents GE0/0/0, GE2 represents GE0/0/10, and GE3 represents GE0/0/3.

**Table 1** Data Planning
Device	Interface	IP Address
CE1	GE1	10.1.1.1/24
CE1	GE2	10.1.2.1/24
PE1	GE1	11.1.1.1/24
	GE2	10.1.2.2/24
	GE3	10.1.3.1/24
	Tunnel4/0/0	1.1.1.1/32
	Tunnel4/0/1	1.1.1.9/32
	Loopback0	1.1.1.1/32
	Loopback1	1.1.1.9/32
CE2	GE2	10.1.4.1/24
CE2	GE3	10.1.3.2/24
PE2	GE1	11.1.1.2/24
	GE2	10.1.5.1/24
	GE3	10.1.6.1/24
	Tunnel4/0/0	2.2.2.2/32
	Tunnel4/0/1	2.2.2.9/32
	Loopback0	2.2.2.2/32
	Loopback1	2.2.2.9/32
CE3	GE1	10.1.7.1/24
	GE2	10.1.5.2/24
	Loopback0	3.3.3.3/32
CE4	GE2	10.1.8.1/24
	GE3	10.1.6.2/24
	Loopback1	4.4.4.4/32

Configuration Roadmap

The configuration roadmap is as follows:

Configure a BGP MPLS/IP VPN and ensure that the unicast VPN is working properly.
Create a GRE tunnel between the PEs to transmit multicast traffic of the VPN instances.
Configure a tunnel policy on each PE and apply the policy to the VPN instance IPv4 address family.
Enable multicast routing and PIM-SM on all devices that provide the multicast service.
Configure IGMP on the interfaces connecting a multicast device to a user network segment to allow the device to manage multicast group members on the network segment.

Procedure

Configure a BGP MPLS IP VPN.

Configure the VPN backbone network and the IP address of each interface in each VPN instance.
Assign an IP address to each interface according to Figure 1. For configuration details, see Configuration Files in this section.
Configure an IGP to interconnect devices on the BGP MPLS/IP VPN backbone network.
OSPF is used in this example. For configuration details, see Configuration Files in this section.

Configure basic MPLS functions on the backbone network.

# Configure PE1.

[PE1] mpls lsr-id 1.1.1.1

[PE1] mpls

[PE1-mpls] quit

# Configure PE2.

[PE2] mpls lsr-id 2.2.2.2

[PE2] mpls

[PE2-mpls] quit

Establish an MP-IBGP peer relationship between the PEs.

# Configure PE1.

[PE1] bgp 100

[PE1-bgp] peer 2.2.2.2 as-number 100

[PE1-bgp] peer 2.2.2.2 connect-interface LoopBack0

[PE1-bgp] peer 2.2.2.9 as-number 100

[PE1-bgp] peer 2.2.2.9 connect-interface LoopBack1

[PE1-bgp] ipv4-family vpnv4

[PE1-bgp-af-vpnv4] peer 2.2.2.2 enable

[PE1-bgp-af-vpnv4] peer 2.2.2.9 enable

[PE1-bgp-af-vpnv4] quit

[PE1-bgp] quit

# Configure PE2.

[PE2] bgp 100

[PE2-bgp] peer 1.1.1.1 as-number 100

[PE2-bgp] peer 1.1.1.1 connect-interface LoopBack0

[PE2-bgp] peer 1.1.1.9 as-number 100

[PE2-bgp] peer 1.1.1.9 connect-interface LoopBack1

[PE2-bgp] ipv4-family vpnv4

[PE2-bgp-af-vpnv4] peer 1.1.1.1 enable

[PE2-bgp-af-vpnv4] peer 1.1.1.9 enable

[PE2-bgp-af-vpnv4] quit

[PE2-bgp] quit

Configure VPN instances on the PEs, so that the CEs can access the PEs.

# Configure PE1.

[PE1] ip vpn-instance vpn1

[PE1-vpn-instance-vpn1] ipv4-family

[PE1-vpn-instance-vpn1-af-ipv4] route-distinguisher 100:1

[PE1-vpn-instance-vpn1-af-ipv4] vpn-target 100:1 200:1 export-extcommunity

[PE1-vpn-instance-vpn1-af-ipv4] vpn-target 100:1 200:1 import-extcommunity

[PE1-vpn-instance-vpn1-af-ipv4] quit

[PE1-vpn-instance-vpn1] quit

[PE1] ip vpn-instance vpn2

[PE1-vpn-instance-vpn2] ipv4-family

[PE1-vpn-instance-vpn2-af-ipv4] route-distinguisher 200:1

[PE1-vpn-instance-vpn2-af-ipv4] vpn-target 100:1 200:1 export-extcommunity

[PE1-vpn-instance-vpn2-af-ipv4] vpn-target 100:1 200:1 import-extcommunity

[PE1-vpn-instance-vpn2-af-ipv4] quit

[PE1-vpn-instance-vpn2] quit

[PE1] interface GigabitEthernet 0/0/10

[PE1-GigabitEthernet0/0/10] ip binding vpn-instance vpn1

[PE1-GigabitEthernet0/0/10] ip address 10.1.2.2 255.255.255.0

[PE1-GigabitEthernet0/0/10] quit

[PE1] interface GigabitEthernet 0/0/3

[PE1-GigabitEthernet0/0/3] ip binding vpn-instance vpn2

[PE1-GigabitEthernet0/0/3] ip address 10.1.3.1 255.255.255.0

[PE1-GigabitEthernet0/0/3] quit

# Configure PE2.

[PE2] ip vpn-instance vpn1

[PE2-vpn-instance-vpn1] ipv4-family

[PE2-vpn-instance-vpn1-af-ipv4] route-distinguisher 100:2

[PE2-vpn-instance-vpn1-af-ipv4] vpn-target 100:1 200:1 export-extcommunity

[PE2-vpn-instance-vpn1-af-ipv4] vpn-target 100:1 200:1 import-extcommunity

[PE2-vpn-instance-vpn1-af-ipv4] quit

[PE2-vpn-instance-vpn1] quit

[PE2] ip vpn-instance vpn2

[PE2-vpn-instance-vpn2] ipv4-family

[PE2-vpn-instance-vpn2-af-ipv4] route-distinguisher 200:2

[PE2-vpn-instance-vpn2-af-ipv4] vpn-target 100:1 200:1 export-extcommunity

[PE2-vpn-instance-vpn2-af-ipv4] vpn-target 100:1 200:1 import-extcommunity

[PE2-vpn-instance-vpn2-af-ipv4] quit

[PE2-vpn-instance-vpn2] quit

[PE2] interface GigabitEthernet 0/0/10

[PE2-GigabitEthernet0/0/10] ip binding vpn-instance vpn1

[PE2-GigabitEthernet0/0/10] ip address 10.1.5.1 255.255.255.0

[PE2-GigabitEthernet0/0/10] quit

[PE2] interface GigabitEthernet 0/0/3

[PE2-GigabitEthernet0/0/3] ip binding vpn-instance vpn2

[PE2-GigabitEthernet0/0/3] ip address 10.1.6.1 255.255.255.0

[PE2-GigabitEthernet0/0/3] quit

Configure the PEs and CEs to set up BGP peer relationships and import VPN routes.

# Configure PE1.

[PE1] bgp 100

[PE1-bgp] ipv4-family vpn-instance vpn1

[PE1-bgp-vpn1] peer 10.1.2.1 as-number 65001

[PE1-bgp-vpn1] import-route direct

[PE1-bgp-vpn1] quit

[PE1-bgp] ipv4-family vpn-instance vpn2

[PE1-bgp-vpn2] peer 10.1.3.2 as-number 65002

[PE1-bgp-vpn2] import-route direct

[PE1-bgp-vpn2] quit

[PE1-bgp] quit

# Configure CE1.

[CE1] bgp 65001

[CE1-bgp] peer 10.1.2.2 as-number 100

[CE1-bgp] import-route direct

[CE1-bgp] quit

Repeat this step for PE1 and CE2, PE2 and CE3, as well as PE2 and CE4. For configuration details, see Configuration Files in this section.

Configure a GRE tunnel. Bind a tunnel interface on a PE to the same VPN instance as the interface that connects the PE to the CE.

In multicast multi-instance over GRE scenarios, a tunnel interface's address must be the same as the GRE tunnel's source address. Otherwise, the GRE tunnel cannot transmit multicast traffic.

# Configure PE1.

[PE1] interface Tunnel 4/0/0
[PE1-Tunnel4/0/0] ip binding vpn-instance vpn1
[PE1-Tunnel4/0/0] ip address 1.1.1.1 255.255.255.255
[PE1-Tunnel4/0/0] tunnel-protocol gre
[PE1-Tunnel4/0/0] source loopback 0
[PE1-Tunnel4/0/0] destination 2.2.2.2
[PE1-Tunnel4/0/0] quit
[PE1] interface Tunnel 4/0/1
[PE1-Tunnel4/0/1] ip binding vpn-instance vpn2
[PE1-Tunnel4/0/1] ip address 1.1.1.9 255.255.255.255
[PE1-Tunnel4/0/1] tunnel-protocol gre
[PE1-Tunnel4/0/1] source loopback 1
[PE1-Tunnel4/0/1] destination 2.2.2.9
[PE1-Tunnel4/0/1] quit

# Configure PE2.

[PE2] interface Tunnel 4/0/0
[PE2-Tunnel4/0/0] ip binding vpn-instance vpn1
[PE2-Tunnel4/0/0] ip address 2.2.2.2 255.255.255.255
[PE2-Tunnel4/0/0] tunnel-protocol gre
[PE2-Tunnel4/0/0] source loopback 0
[PE2-Tunnel4/0/0] destination 1.1.1.1
[PE2-Tunnel4/0/0] quit
[PE2] interface Tunnel 4/0/1
[PE2-Tunnel4/0/1] ip binding vpn-instance vpn2
[PE2-Tunnel4/0/1] ip address 2.2.2.9 255.255.255.255
[PE2-Tunnel4/0/1] tunnel-protocol gre
[PE2-Tunnel4/0/1] source loopback 1
[PE2-Tunnel4/0/1] destination 1.1.1.9
[PE2-Tunnel4/0/1] quit

Configure and apply a tunnel type prioritizing policy on each PE to have the PE select the GRE tunnel for VPN data transmission.

# Configure PE1.

[PE1] tunnel-policy gre1

[PE1-tunnel-policy-gre1] tunnel select-seq gre load-balance-number 1

[PE1-tunnel-policy-gre1] quit

[PE1] ip vpn-instance vpn1

[PE1-vpn-instance-vpn1] ipv4-family

[PE1-vpn-instance-vpn1-af-ipv4] tnl-policy gre1

[PE1-vpn-instance-vpn1-af-ipv4] quit

[PE1-vpn-instance-vpn1] quit

[PE1] ip vpn-instance vpn2

[PE1-vpn-instance-vpn2] ipv4-family

[PE1-vpn-instance-vpn2-af-ipv4] tnl-policy gre1

[PE1-vpn-instance-vpn2-af-ipv4] quit

[PE1-vpn-instance-vpn2] quit

# Configure PE2.

[PE2] tunnel-policy gre1

[PE2-tunnel-policy-gre1] tunnel select-seq gre load-balance-number 1

[PE2-tunnel-policy-gre1] quit

[PE2] ip vpn-instance vpn1

[PE2-vpn-instance-vpn1] ipv4-family

[PE2-vpn-instance-vpn1-af-ipv4] tnl-policy gre1

[PE2-vpn-instance-vpn1-af-ipv4] quit

[PE2-vpn-instance-vpn1] quit

[PE2] ip vpn-instance vpn2

[PE2-vpn-instance-vpn2] ipv4-family

[PE2-vpn-instance-vpn2-af-ipv4] tnl-policy gre1

[PE2-vpn-instance-vpn2-af-ipv4] quit

[PE2-vpn-instance-vpn2] quit

Enable multicast routing and PIM-SM on each interface.

# Configure CE1.

[CE1] multicast routing-enable

[CE1] interface GigabitEthernet 0/0/0

[CE1-GigabitEthernet0/0/0] pim sm

[CE1-GigabitEthernet0/0/0] quit

[CE1] interface GigabitEthernet 0/0/10

[CE1-GigabitEthernet0/0/10] pim sm

[CE1-GigabitEthernet0/0/10] quit

# Configure PE1.

[PE1] multicast routing-enable

[PE1] interface GigabitEthernet 0/0/10

[PE1-GigabitEthernet0/0/10] pim sm

[PE1-GigabitEthernet0/0/10] quit

[PE1] interface GigabitEthernet 0/0/3

[PE1-GigabitEthernet0/0/3] pim sm

[PE1-GigabitEthernet0/0/3] quit

[PE1] interface Tunnel 4/0/0

[PE1-Tunnel4/0/0] pim sm

[PE1-Tunnel4/0/0] quit

[PE1] interface Tunnel 4/0/1

[PE1-Tunnel4/0/1] pim sm

[PE1-Tunnel4/0/1] quit

Repeat this step for CE2, PE2, CE3, and CE4. For configuration details, see Configuration Files in this section.

Configure RPs for the VPN instances.

# Configure CE3.

[CE3] pim

[CE3-pim] c-bsr LoopBack0

[CE3-pim] c-rp LoopBack0

[CE3-pim] quit

# Configure CE4.

[CE4] pim

[CE4-pim] c-bsr LoopBack1

[CE4-pim] c-rp LoopBack1

[CE4-pim] quit

Enable IGMP and add static groups on interfaces. Simulate multicast group join requests.

# Configure CE3.

[CE3] interface GigabitEthernet 0/0/0

[CE3-GigabitEthernet0/0/0] pim sm

[CE3-GigabitEthernet0/0/0] igmp enable

[CE3-GigabitEthernet0/0/0] igmp static-group 225.1.1.1 source 10.1.1.10

[CE3-GigabitEthernet0/0/0] quit

# Configure CE4.

[CE4] interface GigabitEthernet 0/0/10

[CE4-GigabitEthernet0/0/10] pim sm

[CE4-GigabitEthernet0/0/10] igmp enable

[CE4-GigabitEthernet0/0/10] igmp static-group 226.1.1.1 source 10.1.4.10

[CE4-GigabitEthernet0/0/10] quit

Verify the configuration.

# After completing the configurations, check that PIM routing entries are created successfully.

Run the display pim vpn-instance routing-table command on PE1 to view the PIM routing tables of the VPN instances.

[PE1] display pim vpn-instance vpn1 routing-table

 VPN-Instance: vpn1
 Total 0 (*, G) entry; 1 (S, G) entry

 (10.1.1.10, 225.1.1.1)
     RP: 3.3.3.3
     Protocol: pim-sm, Flag: SPT
     UpTime: 00:00:33
     Upstream interface: GigabitEthernet0/0/10
         Upstream neighbor: 10.1.2.1
         RPF prime neighbor: 10.1.2.1
     Downstream interface(s) information:
     Total number of downstreams: 1
         1: Tunnel4/0/0
             Protocol: pim-sm, UpTime: 00:00:33, Expires: 00:02:57

[PE1] display pim vpn-instance vpn2 routing-table

 VPN-Instance: vpn2
 Total 0 (*, G) entry; 1 (S, G) entry

 (10.1.4.10, 226.1.1.1)
     RP: 4.4.4.4
     Protocol: pim-sm, Flag: SPT
     UpTime: 00:43:44
     Upstream interface: GigabitEthernet0/0/3
         Upstream neighbor: 10.1.3.2
         RPF prime neighbor: 10.1.3.2
     Downstream interface(s) information:
     Total number of downstreams: 1
         1: Tunnel4/0/1
             Protocol: pim-sm, UpTime: 00:43:44, Expires: 00:02:47

Run the display pim routing-table command on CE1 and CE2 to view the PIM routing tables of the public network instance.

[CE1] display pim routing-table

 VPN-Instance: public net
 Total 0 (*, G) entry; 1 (S, G) entry

 (10.1.1.10, 225.1.1.1)
     RP: 3.3.3.3
     Protocol: pim-sm, Flag: SPT LOC
     UpTime: 00:01:03
     Upstream interface: GigabitEthernet0/0/0
         Upstream neighbor: NULL
         RPF prime neighbor: NULL
     Downstream interface(s) information:
     Total number of downstreams: 1
         1: GigabitEthernet0/0/10
             Protocol: pim-sm, UpTime: 00:01:03, Expires: 00:03:27

[CE2] display pim routing-table

 VPN-Instance: public net
 Total 0 (*, G) entry; 1 (S, G) entry

 (10.1.4.10, 226.1.1.1)
     RP: 4.4.4.4
     Protocol: pim-sm, Flag: SPT LOC
     UpTime: 00:46:44
     Upstream interface: GigabitEthernet0/0/10
         Upstream neighbor: NULL
         RPF prime neighbor: NULL
     Downstream interface(s) information:
     Total number of downstreams: 1
         1: GigabitEthernet0/0/3
             Protocol: pim-sm, UpTime: 00:46:44, Expires: 00:02:45

The command outputs show that PIM routing entries are created for the VPN instances on the PE and for the public network instance on the CEs. Receivers 1 and 2 successfully receive multicast traffic from Sources 1 and 2, respectively.

Configuration Scripts

CE1 configuration script

#
sysname CE1
#
multicast routing-enable
#
interface GigabitEthernet0/0/0
 undo shutdown
 ip address 10.1.1.1 255.255.255.0
 pim sm
#
interface GigabitEthernet0/0/10
 undo shutdown
 ip address 10.1.2.1 255.255.255.0
 pim sm
#
bgp 65001
 peer 10.1.2.2 as-number 100
 #
 ipv4-family unicast
  undo synchronization
  import-route direct
  peer 10.1.2.2 enable  
#
return

PE1 configuration script

#
sysname PE1
#
multicast routing-enable
#
ip vpn-instance vpn1
 ipv4-family
  route-distinguisher 100:1
  tnl-policy gre1
  vpn-target 100:1 200:1 export-extcommunity
  vpn-target 100:1 200:1 import-extcommunity
  multicast routing-enable 
#
ip vpn-instance vpn2
 ipv4-family
  route-distinguisher 200:1
  import route-policy import
  tnl-policy gre1
  vpn-target 100:1 200:1 export-extcommunity
  vpn-target 100:1 200:1 import-extcommunity
  multicast routing-enable              
#
mpls lsr-id 1.1.1.1
mpls
#
interface GigabitEthernet0/0/0
 undo shutdown
 ip address 11.1.1.1 255.255.255.0
#
interface GigabitEthernet0/0/10
 undo shutdown
 ip binding vpn-instance vpn1
 ip address 10.1.2.2 255.255.255.0
 pim sm
#
interface GigabitEthernet0/0/3
 undo shutdown
 ip binding vpn-instance vpn2
 ip address 10.1.3.1 255.255.255.0
 pim sm
#
interface LoopBack0
 ip address 1.1.1.1 255.255.255.255
 pim sm
#
interface LoopBack1
 ip address 1.1.1.9 255.255.255.255
 pim sm
#
interface Tunnel4/0/0
 ip binding vpn-instance vpn1
 ip address 1.1.1.1 255.255.255.255
 tunnel-protocol gre
 source LoopBack0
 destination 2.2.2.2
 pim sm
#
interface Tunnel4/0/1
 ip binding vpn-instance vpn2
 ip address 1.1.1.9 255.255.255.255
 tunnel-protocol gre
 source LoopBack1
 destination 2.2.2.9
 pim sm
#
bgp 100
 peer 2.2.2.2 as-number 100
 peer 2.2.2.2 connect-interface LoopBack0
 peer 2.2.2.9 as-number 100
 peer 2.2.2.9 connect-interface LoopBack1
 #
 ipv4-family unicast
  undo synchronization
  peer 2.2.2.2 enable
  peer 2.2.2.9 enable
 #
 ipv4-family vpnv4
  policy vpn-target
  peer 2.2.2.2 enable
  peer 2.2.2.9 enable
 #
 ipv4-family vpn-instance vpn1
  import-route direct
  vpn-route cross multipath
  peer 10.1.2.1 as-number 65001
 #
 ipv4-family vpn-instance vpn2
  import-route direct
  vpn-route cross multipath 
  peer 10.1.3.2 as-number 65002
#
ospf 1
 area 0.0.0.0
  network 1.1.1.1 0.0.0.0
  network 1.1.1.9 0.0.0.0
  network 11.1.1.0 0.0.0.255
#
route-policy import permit node 1
 if-match ip next-hop ip-prefix import
#
ip ip-prefix import index 10 permit 2.2.2.9 32     
#
tunnel-policy gre1
 tunnel select-seq gre load-balance-number 1
#
return

PE2 configuration script

#
sysname PE2
#
multicast routing-enable
#
ip vpn-instance vpn1
 ipv4-family
  route-distinguisher 100:2
  tnl-policy gre1
  vpn-target 100:1 200:1 export-extcommunity
  vpn-target 100:1 200:1 import-extcommunity
  multicast routing-enable  
#
ip vpn-instance vpn2
 ipv4-family
  route-distinguisher 200:2
  import route-policy import
  tnl-policy gre1
  vpn-target 100:1 200:1 export-extcommunity
  vpn-target 100:1 200:1 import-extcommunity
  multicast routing-enable    
#
mpls lsr-id 2.2.2.2
mpls
#
interface GigabitEthernet0/0/0
 undo shutdown
 ip address 11.1.1.2 255.255.255.0
#
interface GigabitEthernet0/0/10
 undo shutdown
 ip binding vpn-instance vpn1
 ip address 10.1.5.1 255.255.255.0
 pim sm
#
interface GigabitEthernet0/0/3
 undo shutdown
 ip binding vpn-instance vpn2
 ip address 10.1.6.1 255.255.255.0
 pim sm
#
interface LoopBack0
 ip address 2.2.2.2 255.255.255.255
 pim sm
#
interface LoopBack1
 ip address 2.2.2.9 255.255.255.255
 pim sm
#
interface Tunnel4/0/0
 ip binding vpn-instance vpn1
 ip address 2.2.2.2 255.255.255.255
 tunnel-protocol gre
 source LoopBack0
 destination 1.1.1.1
 pim sm
#
interface Tunnel4/0/1
 ip binding vpn-instance vpn2
 ip address 2.2.2.9 255.255.255.255
 tunnel-protocol gre
 source LoopBack1
 destination 1.1.1.9
 pim sm
#
bgp 100
 peer 1.1.1.1 as-number 100
 peer 1.1.1.1 connect-interface LoopBack0
 peer 1.1.1.9 as-number 100
 peer 1.1.1.9 connect-interface LoopBack1
 #
 ipv4-family unicast
  undo synchronization
  peer 1.1.1.1 enable
  peer 1.1.1.9 enable
 #
 ipv4-family vpnv4
  policy vpn-target
  peer 1.1.1.1 enable
  peer 1.1.1.9 enable
 #
 ipv4-family vpn-instance vpn1
  import-route direct
  peer 10.1.5.2 as-number 65003
 #
 ipv4-family vpn-instance vpn2
  import-route direct
  vpn-route cross multipath 
  peer 10.1.6.2 as-number 65004
#
ospf 1
 area 0.0.0.0
  network 2.2.2.2 0.0.0.0
  network 2.2.2.9 0.0.0.0
  network 11.1.1.0 0.0.0.255
#
route-policy import permit node 1
 if-match ip next-hop ip-prefix import
#
ip ip-prefix import index 10 permit 1.1.1.9 32   
#
tunnel-policy gre1
 tunnel select-seq gre load-balance-number 1
#
return

CE2 configuration script

#
sysname CE2
#
multicast routing-enable
#
interface GigabitEthernet0/0/10
 undo shutdown
 ip address 10.1.4.1 255.255.255.0
 pim sm
#
interface GigabitEthernet0/0/3
 undo shutdown
 ip address 10.1.3.2 255.255.255.0
 pim sm
#
bgp 65002
 peer 10.1.3.1 as-number 100
 #
 ipv4-family unicast
  undo synchronization
  import-route direct
  peer 10.1.3.1 enable  
#
return

CE3 configuration script

#
sysname CE3
#
multicast routing-enable
#
interface GigabitEthernet0/0/0
 undo shutdown
 ip address 10.1.7.1 255.255.255.0
 pim sm
#
interface GigabitEthernet0/0/10
 undo shutdown
 ip address 10.1.5.2 255.255.255.0
 pim sm
#
bgp 65003
 peer 10.1.5.1 as-number 100
 #
 ipv4-family unicast
  undo synchronization
  import-route direct
  peer 10.1.5.1 enable  
#
pim
 c-bsr LoopBack0
 c-rp LoopBack0
#
return

CE4 configuration script

#
sysname CE4
#
multicast routing-enable
#
interface GigabitEthernet0/0/10
 undo shutdown
 ip address 10.1.8.1 255.255.255.0
 pim sm
#
interface GigabitEthernet0/0/3
 undo shutdown
 ip address 10.1.6.2 255.255.255.0
 pim sm
#
bgp 65004
 peer 10.1.6.1 as-number 100
 #
 ipv4-family unicast
  undo synchronization
  import-route direct
  peer 10.1.6.1 enable  
#
pim
 c-bsr LoopBack1
 c-rp LoopBack1
#
return