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Figure 1. PIM over GRE Tunnel Configuration Example

Image RemovedImage Added

As shown in Figure 1, multicast services are deployed in the network. Switch B does not support multicast protocols, so multicast traffic needs to be transmitted between Switch A and Switch C through a GRE tunnel.

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  1. Run OSPF route protocol on Switch A, Switch B and Switch C for underlay communication.
  2. Create GRE tunnel interfaces on Switch A and Switch C to establish a GRE tunnel; Run BGP route protocol on GRE tunnel interfaces.
  3. Enable PIM function on the GRE tunnel interfaces and underlay interfaces to enable the transmission of multicast packets by the GRE tunnel.

Procedure

Switch A

Step1        Configure VLAN interface.

Code Block
admin@SwitchA# set vlans vlan-id 11 l3-interface vlan11
admin@SwitchA# set vlans vlan-id 22 l3-interface vlan22
admin@SwitchA# set interface gigabit-ethernet te-1/1/45 family ethernet-switching native-vlan-id 11
admin@SwitchA# set interface gigabit-ethernet te-1/1/13 family ethernet-switching native-vlan-id 22
admin@SwitchA# set l3-interface loopback lo address 100.100.100.100 prefix-length 32 
admin@SwitchA# set l3-interface vlan-interface vlan11 address 10.1.1.2 prefix-length 24
admin@SwitchA# set l3-interface vlan-interface vlan22 address 10.20.1.1 prefix-length 24

Step2        Enable IP routing.        

Code Block
admin@SwitchA# set ip routing enable true

Step3        Configure OSPF route protocol for underlay communication.

Code Block
admin@SwitchA# set protocols ospf router-id 1.1.1.1
admin@SwitchA# set protocols ospf network 10.20.1.0/24 area 0
admin@SwitchA# set protocols ospf network 100.100.100.100/32 area 0

Step4        Configure GRE tunnel name, IP, source IP, destination IP etc.

Code Block
admin@SwitchA# set l3-interface tunnel tnl0 address 10.40.1.1 prefix-length 24
admin@SwitchA# set l3-interface tunnel tnl0 tunnel-mode gre-ip
admin@SwitchA# set l3-interface tunnel tnl0 source 10100.20100.1100.1100 
admin@SwitchA# set l3-interface tunnel tnl0 destination 10200.30200.1200.2200

Step5        Configure BGP route protocol for the GRE tunnel.

Code Block
admin@SwitchA# set protocols bgp local-as 100
admin@SwitchA# set protocols bgp ebgp-requires-policy false
admin@SwitchA# set protocols bgp neighbor 10.40.1.2 remote-as 200
admin@SwitchA# set protocols bgp ipv4-unicast network 10.1.1.0/24

Step6        Enable PIM on the VLAN interface and GRE tunnel interface, configure Switch A’s GRE tunnel interface as the static RP.

NOTE: Both GRE tunnel interface and underlay interface need to be enabled for PIM.

Code Block
admin@SwitchA# set protocols pim interface vlan11 sm
admin@SwitchA# set protocols pim interface vlan22 sm
admin@SwitchA# set protocols pim interface tnl0 sm
admin@SwitchA# set protocols pim rp 10.40.1.1 group 225.0.0.0/8

Step7        Commit the configuration.

Code Block
admin@SwitchA# commit

Switch B

Step1        Configure VLAN interface.

Code Block
admin@SwitchB# set vlans vlan-id 22 l3-interface vlan22
admin@SwitchB# set vlans vlan-id 33 l3-interface vlan33
admin@SwitchB# set interface gigabit-ethernet ge-1/1/3 family ethernet-switching native-vlan-id 22
admin@SwitchB# set interface gigabit-ethernet te-1/1/1 family ethernet-switching native-vlan-id 33
admin@SwitchB# set l3-interface vlan-interface vlan22 address 10.20.1.2 prefix-length 24
admin@SwitchB# set l3-interface vlan-interface vlan33 address 10.30.1.1 prefix-length 24

Step2        Enable IP routing.         

Code Block
admin@SwitchB# set ip routing enable true

Step3        Configure OSPF for the connections between Switch A, Switch B and Switch C.

Code Block
admin@SwitchB# set protocols ospf router-id 2.2.2.2
admin@SwitchB# set protocols ospf network 10.30.1.0/24 area 0
admin@SwitchB# set protocols ospf network 10.20.1.0/24 area 0

Step4        Commit the configuration.

Code Block
admin@SwitchB# commit

Switch C

Step1        Configure VLAN interface.

Code Block
admin@SwitchC# set vlans vlan-id 33 l3-interface vlan33
admin@SwitchC# set vlans vlan-id 44 l3-interface vlan44
admin@SwitchC# set interface gigabit-ethernet te-1/1/17 family ethernet-switching native-vlan-id 33
admin@SwitchC# set interface gigabit-ethernet te-1/1/23 family ethernet-switching native-vlan-id 44
admin@SwitchC# set l3-interface loopback lo address 200.200.200.200 prefix-length 32
admin@SwitchC# set l3-interface vlan-interface vlan33 address 10.30.1.2 prefix-length 24
admin@SwitchC# set l3-interface vlan-interface vlan44 address 10.2.1.2 prefix-length 24

Step2        Enable IP routing.         

Code Block
admin@SwitchC# set ip routing enable true

Step3        Configure OSPF routes for underlay communication.

Code Block
admin@SwitchC# set protocols ospf router-id 3.3.3.3
admin@SwitchC# set protocols ospf network 10.30.1.0/24 area 0
admin@SwitchC# set protocols ospf network 200.200.200.200 area 0

Step4        Configure GRE tunnel name, IP, source IP, destination IP etc.

Code Block
admin@SwitchC# set l3-interface tunnel tnl0 address 10.40.1.2 prefix-length 24
admin@SwitchC# set l3-interface tunnel tnl0 tunnel-mode gre-ip
admin@SwitchC# set l3-interface tunnel tnl0 source 10200.30200.1200.2200 
admin@SwitchC# set l3-interface tunnel tnl0 destination 10100.20100.1100.1100

Step5        Configure BGP routes for the GRE tunnel.

Code Block
admin@SwitchC# set protocols bgp local-as 200
admin@SwitchC# set protocols bgp ebgp-requires-policy false
admin@SwitchC# set protocols bgp neighbor 10.40.1.1 remote-as 100
admin@SwitchC# set protocols bgp ipv4-unicast network 10.2.1.0/24

Step6        Enable PIM on the VLAN interface and GRE tunnel interface, configure Switch A’s GRE tunnel interface as the static RP.

NOTE: Both GRE tunnel interface and underlay interface need to be enabled for PIM.

Code Block
admin@SwitchC# set protocols pim interface vlan33 sm
admin@SwitchC# set protocols pim interface vlan44 sm
admin@SwitchC# set protocols pim interface tnl0 sm
admin@SwitchC# set protocols pim rp 10.40.1.1 group 225.0.0.0/8

Step7        Configure the IGMP function of the connected receiver interface.

Code Block
admin@SwitchC# set protocols igmp interface vlan44

Step8        Commit the configuration.

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Code Block
admin@switchA# run show pim interface
Interface  State   Address     PIM Nbrs  PIM DR       FHR  IfChannels
 tnl0       up     10.40.1.1   1         10.40.1.2    0    2
 pimreg     up     0.0.0.0     0         local        0    0
 vlan11     up     10.1.1.2    0         local        0    0
 vlan22     up     10.20.1.1   0         local       
0   
0 

admin@switchC# run show pim interface
Interface   State  Address      PIM Nbrs  PIM DR  FHR  IfChannels
 tnl0       up     10.40.1.2    1         local   0    0
 pimreg     up     0.0.0.0      0         local   0    0 
vlan33     up     10.30.1.2    0         local   0    0
 vlan44     up     10.2.1.2     0         local   0    2
  • Run command run show l3-interface tunnel to display information about the GRE tunnel interface.
Code Block

admin@SwitchA# run show l3-interface tunnel tnl0
tnl0        State:UP
            Tunnel Source: 10100.20100.1.1
           100.100   
            Tunnel Destnation: 10200.30200.1.2
           200.200
            Tunnel protocol/transport: gre-ip
            Inet addr: 10.40.1.1
            Traffic statistics:
              5 sec input rate IPv4 1200 packets/sec, IPv6 0 packets/sec
              5 sec forwarding rate IPv4 80 packets/sec, IPv6 0 packets/sec
              IPv4 Input Packets............................28
              IPv4 Forwarding Packets.......................5
              IPv6 Input Packets............................0
              IPv6 Forwarding Packets.......................0

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